bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of the Health Monitoring System Scheme for High Slope in Zhouqu
Authors: Zhu Yan Peng , Li Jing Bang , Zhang Qiang
Published: January 2014

The target of this paper is to get proper information of deformation through monitor the health of a large-scale trial. The slope in the process of the governance and reinforced slope are designed in the test in Zhouqu County, Gansu Province. Through Health Monitoring Test to high slope, the teat is to master deformation and internal force changes of the supporting structure, meanwhile determine the trend of slope deformation. It is possible to send out the warning for slope stability. Through researching the program and analyzing the data of future monitoring, it provides a reliable basis of similar slope engineering for future.
Study on Rising Displacement of Segment of Shield Tunnel in Soft Soils
Authors: Yuan Jin Xiu , Wang Dao Yuan , Wang Dan
Published: January 2014

It has been a technical problem of upward movement for shield tunnel segment during construction. a segment floating calculation formula was deduced through using basic theory of mechanics and mathematics, detailed tension analysis of segment. The computation example of engineering showed that the result obtained by the proposed calculation formula was well consistent with the monitoring result and could be used to analyze the upward movement of shield tunnel. Moreover, the conclusion provided some reference to similar projects.
Calculation and Analysis on Long-Term Settlement of Metro at Hexi Region in Nanjing
Authors: Zhang Bing Qing
Published: January 2014

Calculated the long-term settlement of metro line 1 at Hexi region in Nanjing which constructed by opencut method under static load. It also considered the effect of composite foundation, then made comparison between calculation and measured data. The results show that: The calculation results are basically consistent with the measured values. The settlements of the whole line are uneven obviously. Tunnel settlements are related with the thickness of overburden soil and the property of underlying layer.
Analysis on Surrounding Rock Stability of Joints Strike Parallel to the Cavern
Authors: Zhang Zhi Zeng , Li Yong Tao , Li Xiao Chang
Published: January 2014

In order to study the influence on the different parts of the cavern by joints, the three-dimensional model is built by Patran and then calculated with FLAC3D after meshing. Seven working conditions about different inclination of joints (0°15°30°45°60°75°90°) are considered in the calculation. The results show that low dip joints in vault and steep joints in the sidewall are more dangerous. Therefore, some measures should be used when encountered this situation in this project.
Design of Typical Subway Station Structure and its Enclosure with Open Cut Method in Chengdu City
Authors: Zhou Xiao Jun , Wang Jing He , Mao Lu Lu , Guo Rui
Published: January 2014

In consideration of the geology and hydrogeology of the strata in Chengdu city, and in view of the general depth of subway station, its main structure and retaining enclosure for foundation pit constructed with open cut method is generalized in this paper. In order to expound the design of subway station structure with open cut method, a typical design of subway station in Chengdu subway line 7 is illustrated in the paper. The design of open cut subway station structure and its enclosure in Chengdu is still summarized and can be used to guide the structural design of subway stations under similar conditions with open cut method (OCM).
Study on Design of Tunnel Section for Danba Diversion Tunnel
Authors: Liu Jie , Tang Liang , Zuo Ya , Guo Jin Long
Published: January 2014

Analyzing and Evaluating the stability of the surrounding rock is an indispensable and important part in the tunnel design. In this paper, the surrounding rock stability of Danba hydropower station diversion tunnel is dealt with, FLAC3Dsoftware is used for stability analysis. Selecting three different cross sections for calculation models, comparing with the displacement and principal stress and the plastic zone which calculated by FLAC3D, we can evaluate their stability and get the best diversion tunnel design.
The Research of Key Technology of Construction and the Reasonable Clear Interval of Tunnels with Small Clear Spacing
Authors: Li Gao Min , Zhang Liao Yi , Ma Chao Chao , He Yi Ting , Luo Fei
Published: January 2014

Combined with the current research situation of construction of tunnels with small clear spacing, the key technology of design and construction of tunnels with small clear spacing is summarized, which primarily consists of rational clear interval of tunnels with small clear spacing, advanced support, construction methods and clip rock reinforcement. The passage describes various methods of key technologies currently in use and the selecting rule under the condition of various categories of surrounding rocks, which has some significance on the safe construction of tunnels with small clear spacing.
Gm (1,1) Model Analysis of Swelling Rock Mechanical Properties in Hydraulic Electric Power Project
Authors: Yang T.H. , Zheng Q.H. , Wang Y. , Wang S.F.
Published: January 2014

In the construction of hydraulic electric power, softening and slaking of swelling rock is a natural phenomenon, which is a complex process and affects the stability of rock engineering. It is difficult to describe and predict quantitatively the dynamical properties of the soft rock making use of a common method. Grey theory has proven successful in research such a complex system. This paper proposed GM(1,1) model based on remanent error analysis to the experimental fitting value of gargillite mechanical parameters, which is regarded as a new way of describing the nonlinear mechanical properties of soft rock and applied to predict the instability of engineering rockmass.
Numerical Simulation of Safe Distance between Concealed Karst Cave and Tunnel Based on Shear Strength Reduction Method Safety Factor Catastrophe
Authors: Lai Yong Biao , Wang Mang Shu , You Xin Hua
Published: January 2014

The numerical simulation method of safe distance between concealed karst cave and tunnel based on shear strength reduction method safety factor catastrophe is proposed. The safety factor of different distance between concealed karst cave and tunnel can be obtained using strength reduction finite element method numerical calculation with the finite element solution non convergence as the standard rock damage, then compare the safety factor of different distance, the catastrophe of safety factor corresponding to the distance is the safe distance between concealed karst cave and tunnel, and the plastic zone of rock stratum between concealed karst cave and tunnel is reaching run-through state, which is verified by engineering example.
Similitude Material Confecting of Tunnel Model in Shaking Table Test
Authors: Deng Xiao Ning , Jiang Yun Hui , Wang Zhi Jia , Liu Fei Cheng , Zhang Jian Jing
Published: January 2014

On the basis of analyzing recent years research achievement of similitude material, we adopt cement, gypsum, blanc fixe and water to perform matching experiment. Orthogonal test has been used in this experiment. From the calculating data, it can be received that density, elasticity modulus and ultimate compressive strength in different specimens. Meanwhile, the relationship between elasticity modulus, ultimate compressive strength and the proportion of each composition is obtained. The results show that the similitude material is recognized to satisfy actual tunnel lining properties such as elasticity modulus and ultimate compressive strength .
Numerical Analysis of Safety on Waste-Dumping Cover-Slope out of the Tailings Dam
Authors: Yang Kai , Lv Shu Ran , Wang Chun Xue
Published: January 2014

Mining companies intend to solve the problem of waste dump and reduce the production cost by dumping a large number of waste soils to cover slope outside the running tailings. Therefore, in order to discuss the safety of waste dump slope covering in front of the tailings dam, numerical method was adopted to study the seepage-line change law, the pore water pressure and anti-sliding safety before and after the waste dump covering out of tailings dam. The researches show that the key to waste-dump slope safety are the drainage performance of waste dump bottom layer and the anti-sliding safety of waste dump soil. The appropriate waste dump slope work can improves the tailings dams safety and solves the waste dump problem in mining production.
Ground Penetrating Radar (GPR) and its Application in Tunnel Engineering
Authors: Lin Chun Jin , Li Shu Cai
Published: January 2014

A Ground Penetrating Radar (GPR) method was conducted for advanced geological prediction in Wuchiba Tunnel field, Hubei Province, China. A 100 MHz antennae is applied. Reflection characteristics of water are studied. Theoretic and case studies indicate that the reflection characteristics of water or mud are: The reflection energy (amplitude) is high; the reflection frequency is low and the reflection phase is inverse (the phase difference is 180°). These characteristics are the main criterion of water and is instructive for further GPR advanced geological predictions in similar geological fields.
Intelligent Control of Ventilation System for Tunnel Group of Highway Section
Authors: Jiang Feng , Fang Yong , Zhou Chao Yue , Zhang Xue Jin
Published: January 2014

With the development of tunnel technology, the number of tunnels becomes huge in some area, and adjoining tunnels turn into tunnel group in some highway sections. So, to ensure the traffic safety, the linkage ventilation control system for the tunnels of the whole highway section is necessary and essential. In this research, obtaining the live traffic information of each tunnel is the key point. This article attempts to build up an intelligent ventilation system which makes traffic flow data of every tunnel available and predictable. The system achieves information sharing and build up weight-based traffic forecasting model. In addition, the composition of fuzzy-logic ventilation control model is introduced. The research might expand the application of intelligent tunnel ventilation control system and could provide references to other linkage ventilation control system of tunnel groups.
Research on Plane Strain Model Test of Rockburst of Underground Cavern in Hard Brittle Rockmass
Authors: Jiang Yu Zhou , Wang Rui Hong , Tang Tian Cai , Guo Jin Long
Published: January 2014

In order to study the failure process and mechanism of rockburst of underground cavern, the physical model materials of hard brittle rock which is gotten though similar material test and have the tendency of rockburst are prepared for making cavern physical models of 1000mm*1000 mm*1000mm and φ 150mm. Then plane strain physical model test is carried out on the machine for large-scale physical model test in geotechnical engineering. The results show that the state of rock switches from the elastic to the plastic on the condition that horizontal and vertical load of the model is equal and increase synchronously. The failures of hard brittle rock burst in surrounding rock are mainly in the initial crack of rock. The phenomenon of separation by layer appears around the cave walls. Damage occurs in very short time and extremely narrow loading range and is sudden with chippings popping or fragments falling. After failure rock stress readjusts and keeps relatively stable in a relatively long time and loading range.
Structural Analysis and Design of Slipway Floor with Anchor Jacked Piles
Authors: Mei Can , Fu Xu Dong , Zhang Ben Jiao
Published: January 2014

The rapid advance of shipbuilding industry generates greater demands on port and waterway engineering. The reconstruction and maintenance of infrastructure supporting shipbuilding industry also has aroused extensive attention. Since the tonnage of ship increases, the bearing capacity of slipway floors can’t meet the working requirement with the moving load of ships. As for the bearing capacity insufficiency, grouting, anchor jacked piles and bored piles are generally used. However, the anchor jacked pile has better practicality and applicability for easier to control construction quality and smaller damage to the original slipway floor. At present, methods based on Winkler foundation model have been more popular in the engineering practice. But Winkler foundation model can’t consider the interaction between pile and soil, the calculated structural internal force of slipway floor is far from the truth. In order to correct Winkler foundation model imperfections in this aspect, this paper provided the method of equivalent bedding value. In terms of area weighted means, the equivalent bedding value of pile and soil in the influence area would be got. Then this weighted area of pile and soil and other areas of soil could be equivalent to springs with different stiffness coefficients for calculating the structural internal force of slipway floor. To some degree, this method reduced the stress concentration on the top of piles and was closely to the reality, remedying some weaknesses of Winkler foundation model. This method may have definite reference value for foundation plate design in engineering application.
Water Environmental Quality Assessment and Protection Strategies of the Xinlicheng Reservoir, China
Authors: Zhang Xian Fu , Xiao Chang Lai , Li Yong Qing , Song Ding Feng
Published: January 2014

Based on the monthly monitoring data in the Xinlicheng Reservoir from 2008 to 2011 in 3 zones (fluvial, transitional and lacustrine), 6 water quality variables were selected as evaluation indicators to evaluate the water environmental quality by improved Nemerow comprehensive pollution index method. The results indicated the reservoir water quality reached classII or III during the study period and met the requirements of centralized drinking water. No significant differences (P > 0.05) for Nemerow indexes were detected among seasons and zones. However, that Nemerow indexes slightly decreased along the longitudinal axis of reservoir showed the water quality in the lacustrine zone was better than that in the fluvial zone, which implied the reservoir ecological system had self-purification function. The improved Nemerow index method based on weight is objective, and the pollution factor with maximum weight is total phosphorus (TP) which is followed by ammonia nitrogen (NH3-N) and total nitrogen (TN). Water quality protection strategies should focus on controlling nutrient emissions and prevent eutrophication, including exogenous governance and endogenous control.
The Impact on the Pier of Shaped Charge Ice-Breaking and Numerical Simulation Analysis
Authors: Meng Wen Yuan , Li Jia Qing , Guo Ying Kui , Xu Guan Chao , Guo Jun Wei
Published: January 2014

In the process of shaped charge ice-breaking , the response of piers is great under the impact of air, ice, water etc, and relates to integral security of the bridge. For the impact on the pier with burst points of the different distances is simulated by ANSYS / DYNA software, summarizes the impact on the pier of shaped charge ice-breaking, and obtains the maximum stress curves of the pier at different distances. Simultaneously, the paper analyses critical damaging- model of the C30 reinforced concrete piers in detail. The conclusion has a major role in guiding when shaped charge ice-breaking appears.
Study on Dynamic Properties of the Intake Tower with Finite Element Method
Authors: Gong Cheng Lin , Liu Hua , Zhang Jian
Published: January 2014

Intake tower is a complex structure, which has complex boundary conditions and has complex loading situation. Intake tower is made up of reinforced concrete ,which is thin-wall hollow structure. It builds in the near the shore in the reservoir, its top bridge connects to the banks of the river, The tower is in the water and is under pressure, intake towers safety is very important under the action of earthquake. Based on the large finite element software ANSYS, the dynamic properties of the intake tower is studied, and the intake tower+ foundation is also studied. The research conclusions can be used as reference for engineering design.
Analysis and Study of Back Eddy Flow Field Effecting Compact by Angle of Meeting Flow of Reef
Authors: Wang Kai Min , Yang Yi Hong , Chen Yong , Luan Shu Guang
Published: January 2014

By changing artificial-reefs meeting flow angle, Use the CFD imitate three-dimensional flow field under the compaction of constant flow, and analyze the effect of back eddy flow field quantitatively. The results show that, with the reduction of the angle of the meeting flow, the length; height; width of back eddy has the tendency of becoming small; when the angle become Ninety the effecting of the back eddys flow field is the best.
Research of Sediment Transport Test Based Suction Jet Technology
Authors: Chen Jun Jie
Published: January 2014

Suction jet scheme has brought forward sediment suspension transport work parameter in the scheme of water and sediment transporting and sediment adding in discharge water before the flood season of Xiaolangdi Reservoir. Suction jet system starts suspended sediments as per 1 natural bottom slope of Xiaolangdi Reservoir while jet pump eject muddy water, which forms into density current and transport forward, and makes longitudinal deposition in the process of sediment transport. Transport distance shall be 1,264~1,903m while 50% longitudinal attenuation of sediments as effective transport distance. Bottom slope of sediment deposition is reduced to 6.7 with obscure longitudinal attenuation of sediments and can transport to longer distance.
Hydraulic Model Test Applied in Water Control Project for Risk-Elimination and Reinforcement of the West Bridge
Authors: Wu Guo Ying , Ren Yan Fen
Published: January 2014

According to the current situation of water control project, the existing problems and the audit opinions of superior administrative departments, water control pivot of the West Bridge over the Aksu River is in urgent need of risk-elimination and reinforcement. Based on hydraulic model test, discharge capacity and sand transporting effect of floodgate and scouring sluice as well as design reasonability of energy dissipation and erosion control structure at pivot downstream have been observed and measured in risk-elimination and reinforcement of the West Bridge. It is indicated in experimental research, compared with the designed flow and checked flow in the design, the measured water levels of the floodgate are 0.43m and 0.47m lower, and measured water levels of scouring sluice are 0.12m and 0.15m lower; opening ten holes of the floodgate can take significant sand transporting effect, while scouring sluice makes insignificant sand transporting effect; it is suggested that design institute shall take erosion control measures into consideration within 100m to the floodgate tank.
Correlation between Grain Production and the Water Supply in Yunnan
Authors: Wang Jian Xiong , Li Pan
Published: January 2014

In recent years in yunnan province grain production increase in volatility,The high and stable yield of grain without good irrigation. Agriculture is water conservation, Industrial and agricultural water use ratio is about 1:4 in China, the main contradiction of supply and demand of water resources in agriculture.Due to other reasons, agricultural water supply reliability will be further reduced.In the case of agricultural water situation has deteriorated, in order to ensure and enlarge the scale of regional food production,urgently needs to research and develop to solve the contradictory between food production and supply of water resources in this area.
Effects of Different Irrigation Treatments on Maize Water Consumption, Growth and Yield under Film Hole Irrigation
Authors: Dong Yu Yun , Wang Bao Cheng , Jia Li Hua , Fei Liang Jun
Published: January 2014

Through film hole irrigation test-pit experiments,the effects of different irrigation treatments on water consumption,growth characteristics and maize yield were studied.The result showed that the jointing stage and heading stage were the key stages of water requirement of maize.Water consumption increased with the increased irrigation quota at the same number of irrigation.Effect of irrigation treatment on maize biological index was significant in less irrigation times and less irrigation quota.Water production efficiency increased 23.3% and yield increased 15.9% under film hole irrigation than that of border irrigation.Water consumption of the maximum yield was 3410m3/hm2 under film hole irrigation.
Analysis of Meteorological Elements Variations of Chongqing over the Past 60 Years
Authors: Long Xun Jian , Zhang Chun Min , Yang Tao Hong , Huang Yu Lin
Published: January 2014

The power of a test is the probability that it cannot reject a null hypothesis when it is true. With interchangeably of non-parametric Mann-Kendall test, practical application is used in meteorological elements analysis. In this study, trend detection of meteorological elements data of Shapingba district in Chongqing, during 1951 to 2011, was estimated by non-parametric Mann-Kendall test. The analyzed elements are composed by mean precipitation, annual sunshine hours, annual humidity, annual mean temperature and annual mean wind speed. And the results show that inter-annual variations of precipitation and mean annual relative humidity are not significant. However, inter-annual variation of sunshine duration is significantly reduced, while inter-annual temperature and wind speed are significantly increased. At the same time, the non-parametric Mann-Kendall test also detects the trend on seasonal data. It is different from the annual data, and trends in different seasons show markedly different.
Analysis of the Characteristics of Discharged Sediment in Yangtze River Estuary
Authors: Gao Kai Chun
Published: January 2014

The global estuarial studies have focused on water and sediment flux into the sea and the effect of human activities on the evolution of estuarial water and sediment. In the present study, we elaborated the impact of human activities on the water-sediment relation based on the water and sediment features at Datong Station (1951-2008). The results showed that the annual runoff of several years was slightly increased in 1990s in Yangtze River (Yangtze) River estuary. The changes were not obvious in these years. The suspended sediment flux (SSF) showed a phased downward trend, which was associated with water storage of the Three Gorges reservoir, the middle-and down-stream river-lake relationship, artificial sand excavation and water drinking and regulation. The ratio average of suspended sediment less than 0.01mm and 0.05mm was increased from 1987 to 2002 than the value before 1986. The value reached the maximal in 2003, and afterwards the sediment flux ratio of these two particle sizes was decreased. After 1986, the total SSF was reduced. The SSF less than 0.01mm showed a wavy decline along with the increase of suspended sediment ratio, while the SSF less than 0.05mm was decreased along with the reduction of the total suspended sediment flux. Meanwhile, the average of median suspended sediment particle size was 0.027mm before 1986 and was 0.0094mm from 1987 to 2008. The inflexion point appearing in 1986 was consistent with the inflexion point of SSF reduction. It was directly related to water storage of the Gezhouba Dam. The median particle diameter of riverbed sand had an increase of 0.01mm/10a in average after 1977. The maximal particle diameter of riverbed sand had changed little. Both suspended sediment and bed sand became fine along the estuary and slightly became coarse in the mouth, indicating that it was functioned as the estuarial filter. The above observations would provide valuable insights for science and objective evaluation of the effect of human activities on an estuary.
Research of Consolidation Experiment of Bentonite in GMZ
Authors: Wu Jing Jing , Qiao Lan , Li Zhen , Hou Jun Jie
Published: January 2014

Bentonite is usually used as the material to buffer and backfill in the deep geological disposal of radioactive waste area.Compression properties of bentonite are important parameters in the evaluation of bentonite.Through the consolidation experiment indoor, the change of void ratio in different pressure and the compression of bentonite of GMZ are concluded. The gotten compression feature have a great significance to the judgment of compression index of the bentonite in GMZ.
Soil Moisture Inversion Using AMSR-E Remote Sensing Data: An Artificial Neural Network Approach
Authors: Xie Xing Mei , Xu Jing Wen , Zhao Jun Fang , Liu Shuang , Wang Peng
Published: January 2014

In this work artificial neural network with a back-propagation learning algorithm (BPNN) is employed to solve soil moisture retrieval for Sichuan Middle Hilly Area in China. Eighteen kinds of BPNN models have been developed using AMSR-E observations to retrieve soil moisture. The results show that the 18.7GHz band has some positive effect on improving soil moisture estimation accuracy while the 36.5GHz may interfere with deriving soil moisture, and vertical brightness temperature has a closer relationship with observed near-surface soil moisture than horizontal TB. The BPNN model driven by vertical and horizontal TB dataset at 6.9GHz and 10.7GHz frequency has the best performance of all the BPNN models withr value of 0.4968 and RMSE 10.2976%. Generally, the BPNN model is more suitable for soil moisture estimation than NASA product for the study area and can provide significant soil moisture information due to its ability of capturing non-linear and complex relationship.
The Effect of Suction on the Swirling Flow of Non-Newtonian Fluid
Authors: Ming Chun Ying , Zheng Lian Cun , Zhang Xin Xin
Published: January 2014

The flow of an incompressible viscous power-law fluid over an infinite rotating disk with uniform suction or injection is studied. The governing differential equations, which are partial and coupled, are simplified to a set of ordinary differential equations by generalized Karman similarity transformation. Numerical solutions of the non-linear two point boundary value problem are obtained by multi-shooting method. The effects of the power-law index and the porous parameter on the velocity fields are discussed for shear thinning fluids.
Research of GPS Elevation Conversion Based on Least Square Support Vector Machine and BP Neural Network
Authors: Liu Li Long , Zhang Teng Xu , Zhou Miao , Wang Wei , Huang Liang Ke
Published: January 2014

This paper proposed the optical weighting combined mode of Least Square Support Vector Machine (LS-SVM) and BP Neural network. According to the measured data, this paper compared and analyzed the accuracy of LS-SVM model, BP Neural network model; quadratic polynomial curve surface fitting based on Total least-square algorithm and optimal weighting combined model, the data shows that the optimal weighting combined model has higher precision then others.
Assessment of EGNOS Model over Asia Area Using IGS_ZTD
Authors: Liu Li Long , Zhou Miao , Zhang Teng Xu , Wang Wei , Huang Liang Ke
Published: January 2014

In this study, three years of the zenith tropospheric delay (ZTD) data observed from 46 International GNSS system (IGS) sites distributed in Asian area used to assess the effectiveness and accuracy of ZTD calculated from EGNOS model, and the application of the EGNOS model are also analyzed in Asian area. Relative to IGS observed ZTD, the bias and root mean square (RMS) for ZTD calculated from EGNOS model presents an obvious variation in temporal and spatial. These results provide a reference for the study of the tropospheric delay correction model, the real-time GNSS navigation and positioning.
Construction Techniques and Measures of GFRP Bars Pile in the Excavation
Authors: Li Xiu Hua , Cong Wei Min , Yue Chen Xi , Hu Chun Qing
Published: January 2014

GFRP bars pile as supporting structures for application in foundation engineering, the construction process of molding and banding quality directly affects the safety of the structure, ease of construction and appearance quality. Through practice on multiple projects, worked out a more mature construction process, better control of the quality of construction projects GFRP bars, standardized operating procedures.
Diagnostics of Current Developments in the Field of Building Airtightness
Authors: Kraus Michal , Kubečková Darja
Published: January 2014

One of the basic principles of energy efficient buildings in accordance with sustainable development is perfectly airtight building envelope. Oversized heat loss through the building envelope leakage adversely affects the energy balance of buildings. The paper provides diagnostic of the recent developments in airtightness of buildings using qualitative method. The aim of this paper is to draw conclusions - dependences, definitions of weak and strong points of the process, their causes and consequences.
Studies of the Small Leakage in Buried Gas Pipeline under the Condition of Soil Properties
Authors: Cheng Shu Juan
Published: January 2014

Analyzing the characteristics of the gas diffusion in soil porous media, and using proper coefficient to correct the calculation model of aerial pipeline leakage,with which to establish the diffusion model of buried gas pipeline. Combined with the mass conservation equation, fick diffusion equation and relative diffusion coefficient equation to build three-dimensional steady-state diffusion model. Then using dimensionless analysis method to calculate the diffusion equation. Through example analysis to research gas concentration fluctuations with the change of buried depth, aperture size, soil properties. Get the rule of small aperture leakage under the condition of different soil properties and rainfall, and it can be used as reference basis for scientific positioning and adopting emergency measures.
Performance Analysis on a Solar-Driven Air-Cooled Ejector Refrigeration System for Air-Conditioning Using Ammonia as Refrigerant
Authors: Liao Yu Hang , Lu Wei , Pan Lie
Published: January 2014

The performance of a solar-driven air-cooled ejector refrigeration system using ammonia as refrigerant with rated cooling capacity of 10.5kW was analyzed for air-conditioning purpose. The cooling capacity of the proposed system increases with the rising of indoor temperature and enhancement of solar irradiance, while decreases with the rising of outdoor temperature. The COP has similar changing trend with that of the cooling capacity except that it increases rapidly with the enhancement of solar irradiance firstlyand then become stable by and large after solar irradiance exceeding a certain value. The cooling capacity is 6.3~52kW and the COP 0.06~0.11 under the normal operating conditions with indoor temperature over 27, outdoor temperature below 38°C and solar irradiance surpassing 500 W/m2. The proposed system can match the climatic conditions in air-conditioning season of Nanning, a typical city in hot summer and warm winter region.
Numerical Analysis on the Heat Transfer Characteristics of the Radiator in a Heating Room
Authors: Wang Ye
Published: January 2014

Natural convective heat transfer is the most important means to supply heat load for resident building to keep necessary indoor air temperature in winter. To determine the surface convective heat transfer coefficient (CHTC) of a radiator is of primary importance to evaluate the heat flow within building interiors, and thereby to affect the thermal comfort and the overall energy consumption of a building. In this paper, a turbulent k-ε model is used to numerically analyze the heat transfer characteristics of a radiator used in a heating room in Lanzhou region of China. The results indicate that the averaged Nu number of radiator surface increases with increasing outer wall thermal conductivity, decreasing outdoor temperature and decreasing radiator surface area, respectively. And the outer wall thermal conductivity has weak influence on the local Nu number of radiator surface.
Design of Solar Heated Water System Based on TLD System in Baotou
Authors: Xu Wei , Zhang Xiao , Tian Zhi Chang
Published: January 2014

Solar energy is a new manner of clean energy with potential for development in the 21st century. In light of the design of TLD (Tuned Liquid Dampers), the technology of solar heated water system is innovatively put forward to supply hot water for residents. Particular attention is given to analyze the limitations of TLD system. Taking a high-rise building of Baotou as an example, the amount of solar radiation is calculated and data collected are presented in Baotou. There is a focus on counting the load of solar heated water through the life water demand, which determines the area of collector. Finally, the feasibility of solar water heating system is showed in the results by the utilization of TLD system, which provides a certain reference action for future research work of TLD system.
Sizing the Thickness of the Coated Insulation against Methane Leakage Coming out of Bedrock
Authors: Solař Jaroslav
Published: January 2014

On the surface of the Earth, methan is usually located in undermined areas, especially in places where the mining was stopped already. The protection of buildings from methan coming out of bedrock can be provided by layer isolation made of suitable type of polymer foil. The entry deals with the matter of designing the isolation against penetrating methan coming out of bedrock into surface line buildings (e.g. shaft, reservoir, water tower etc.).
Analysis of Suspended Pipeline Stress Sensitivity
Authors: Wu Xiao Nan , Lu Hong Fang , Wu Shi Juan , Kun Huang , Chen Xi , Kang Fu Xin , Liu Zi Lin
Published: January 2014

Natural gas pipeline laying process will inevitably go through some of the earthquake-prone areas, these areas of soil subsidence, will cause the pipeline vacant, vacant section of the pipeline failure may cause pipeline rupture. Effects of suspended pipeline stress safety usually have two factors: suspended length and the buoyancy of water. In order to explore the sensitivity of these two factors on suspended pipeline stress, we do numerical simulation of XX suspended pipeline using the general stress analysis software CAESAR II. Research shows that suspended length of pipe is having a greater sensitivity on pipeline stress, and the buoyancy of water is relatively small. The results provide some reference for safety management and selection of pipeline.
Gravimetric Method for Calibrating Flow Meter
Authors: Zhang Xi Ming , Li Xue
Published: January 2014

What the earth obtain the energy annually is ten thousand times of the earth energy consumption at present,but the solar energy has a lower energy density on the earth’s surface .solar energy is the main source of all energy The experimental research was conducted for the heating performance utilizing the solar-assisted heat pump experimental platform. Experimental errors will be caused to flow meter by different measured media and long time usage In order to improve measurement precision and reduce the experimental errors, this test use gravimetric method to calibrate the LZB glass rotor meter and MCE08-787 cumulative flow meter of indoors and outdoors pipes. The paper also presents flow correction coefficient to guarantee both the accuracy and reliability of the experimental results.
The Layout of Cities of Earthquake Disaster Reduction Emergency Shelter Research
Authors: Zhao Qing Shuang , Ning Shang , Jin Jie
Published: January 2014

This paper analyses the construction of present situation and the existing problems of Chinese cities emergency shelters, proposed Chinese cities emergency shelters countermeasures and suggestions in the planning layout, processing the scientific and rational layout of Chinese cities emergency shelters to improve the ability of Chinese cities earthquake disaster reduction. Hoping this paper can provide some reference for other cities of earthquake disaster reduction emergency shelters layout studies.
Research on Seismic Disaster Prevention Plan in Overall Urban Planning Management
Authors: Zhao Qing Shuang , Chen Xiang Jun , Jin Jie , Zhou Chang Lei
Published: January 2014

This article through the analysis of the overall urban planning and the correlation between urban earthquake disaster prevention plan, and points out that the overall urban planning management in the problems of earthquake disaster prevention plan, and puts forward the establishment of urban earthquake disaster prevention plan suggestions and countermeasures.
Combustion Performance of Composite Floor with Different Radiant Heat Flux
Authors: Xu Yan Ying , Wang Ruo Jun , Chen Jian , Li Lu Chao
Published: January 2014

The combustion performance of engineered wood flooring and intensive composite floor under the different radiation heat flux were experimented by cone calorimeter. Fire parameters were measured including the ignition time and heat release rate. Experimental results show that the ignition time of engineered wood flooring is much lower than intensive composite floor, and the ignition time are decreased with the increase of radiation heat flux. The heat release rate (HRR) curve has two peaks under the same radiation heat flux, and the first peak of the heat release rate of engineered wood flooring occurs significantly earlier than intensive composite floor. The heat release rate is increased and the first peak significantly ahead of time with the increase of the radiation intensity
Gas Explosion Effect on Structure Damage and Control Measures
Authors: Li Feng Ge , Chen Long
Published: January 2014

Gas explosion is a kind of harm partial load by accident, it is the main cause continuity of the collapsed buildings. Based on the gas explosion of a frame structure damage detection, this paper analyzed the characteristics of gas explosion and put forward problems when building structure design as well as the prevention and control measures of gas explosion.
Numerical Study of Effect of Joint Tip Distance from Sample End on Rock Failure
Authors: Zhang Yun Jie , Fan Cheng
Published: January 2014

In this paper,the mechanical properties of rock experiencing the variation of joint tip distance from sample end under uniaxial compression condition were simulated.Numerical simulation for the different rock sample in the uniaxial compression have been conducted to evaluate the effects of joint tip distance from sample end on the overall mechanical behaviour of jointed rock masses. It was done using the Rock Failure Process Analysis program RFPA2D. Numerically simulated stress-strain curve, peak stress, peak strain and failure patterns were compared with the corresponding physical tests. We found that specimen joint tip distance from sample end corresponding value (distance from the crack tip to the compression surface) linear relationship with the compressive strength values .Numerical simulations agree well with physical results, it is shown that RFPA2Dis suitable for the analysis of joint tip distance from sample end effect on rock fracture.
Fire Risk Assessment of Spruce Pellets
Authors: Martinka Jozef , Chrebet Tomáš , Hrušovský Ivan , Balog Karol , Hirle Siegfried
Published: January 2014

In the presented paper is assessed fire risk of pellets made from spruce wood (Picea abiesL.) without bark, processed by hot pressing without the use of additional chemicals. Fire risk was assessed on the basis of heat release rate (HRR), the specific carbon monoxide production rate (SCPR) and the time dependence of the induction period of spontaneous ignition on temperature. HRR and SPCR were determined on the cone calorimeter test performed according to ISO 5660-1:2002 standard. Samples were loaded by 20 kW/m2heat flux during the test. The maximum HRR was 229 kW/m2and average HRR was 55 kW/m2. Maximum SCPR was 0.37 g/(m2s) and the average SCPR was 0.16 g/(m2s). The dependence of the induction period of spontaneous ignition on temperature was determined by a modified test performed according to ISO 871:2006 standard. Modification of the test procedure was based on measurement of the induction time period of the spontaneous ignition on temperature, and temperatures higher of 20, 40, 60, 80 and 100 °C than spontaneous ignition temperature. The obtained data proved an exponential dependence of the induction period of spontaneous ignition on temperature.
Elastic Fields of Interacting Elliptical Inhomogeneities for Two-Dimensional Problems Based on the Equivalent Inclusion Method
Authors: Zhang Jiong , Huang Qi Qing , Qu Zhan
Published: January 2014

In this paper, the equivalent inclusion method is used to calculate the elastic fields of a two-dimensional plate containing any number of ellipitical inhomogeneities. Both the interior and the exterior Eshelbys tensors are used in this method. Numerical examples are given to assess the performance of the presented method. The solutions obtained with this method have been checked and confirmed by the finite element analysis results.
Study on the Conversion of GOCAD Models to FLAC3D Models
Authors: Ni Xiao Dong , Chen Ke
Published: January 2014

In the analysis of the GOCAD SGrid model and the FLAC3D hexahedral mesh model, a method of converting the former to the latter is proposed, and the data conversion program is prepared based on VB.NET. The purpose of building complex models in FLAC3D quickly is achieved, and the FLAC3D simplifies the pre-processing largely. Finally, the feasibility of the method is verified by a practical project.
The Application of Impact Tester for Compaction Control
Authors: Wu J. Y. , Wang J. X.
Published: January 2014

The safety of the earth structures is highly dependent upon the fill compaction quality. Recently developed nondestructive testing techniques (NDT) present many advantages in comparison with conventional field density measurements. Therefore, use of NDT in monitoring of the fill quality appears to be attractive for future pavement geotechnics applications. This paper presents an alternative technology using non-destructive Clegg impact tester for compaction control in silty sand. 132 compaction tests and impact tests with varying values of compaction effort, moisture content, and density were conducted in laboratory. Each observed impact value (Iv) was then considered as a function of its corresponding compaction effort, moisture content and dry density. Results of the study show that for the silty sand tested, the variations of Iv with moisture content are similar to the corresponding unique moisture-density compaction relationship. The values of Iv generally correlate well with moisture-density relationship for each compaction effort. Along with a speedy moisture tester, dry density can be predicted using target Iv values in a fast and efficient manner based on current standard specification.
Study on Establishment and Transformation of Coordinate System of Steel Structure in 3D Software
Authors: Sun Kai , Wei Lu Shuang , Xuan Li , Zhou Lun Gang
Published: January 2014

The 3D visualization design of steel structure under the CAD environment needs to work in the global coordinate system (WCS), but design of various steel members in the 3D space must be completed in the local coordinate system (UCS), so it is perplexing for the conversion and calculation between UCSi (i=1,2,3....n) and WCS. It is proved that the maize grains are not polluted and food production is in safe condition. The article describes classification of several common coordinate systems, discuss the method of setting up coordinates system. Describe the process of type convertion of coordinate system in steel structure design and detailing softwares, and explained the advantage of the application in the real world project.
Development of BIM Technology in Steel Structure Design Software
Authors: Wei Lu Shuang , Wei Qun , Sun Kai
Published: January 2014

The workflow of traditional steel often causes the lack of information, and the high cost, reduced efficiency in the various stages of the project. BIM technology simulate building by digital real information, share the information by central document, that close connection with the various stages of the process, and exchange information, so as to improve efficiency and reducecosts.Based on the concept of Building Information Model, the article explains the design and construction of 3D SteelGate software system. By adopting the Object-Oriented Design model, the article established parameterized database used for model construction in steel constructions. Article also describes the application in steel design software with the help of design model, analysis model and the drafting model.
Comparative Study of the Housing Security Object Definition Methods
Authors: Hu Chang Ming , Yang Jian Hua , Guo Bin Qi
Published: January 2014

Due to the complexity of the definition of the housing security object, the object recognition mostly depends on experience data, lacking theoretical support. The scientific method to define the income line of the housing security object is the key to ensure the appropriate level of housing security and the fairness of social welfare. This paper introduces several common methods to define the income line of housing security, and the main problem of these methods is not matched with the multi-level security system. For that, this paper introduces the method to define the income line of the housing security object based on income distribution function and the quantile theory, uses EViews to analyze house security object, and puts forward relevant suggestions for improving the management of the security object.
Improvement of the Formula of Foundation Settlement which Considering Three-Dimensional Transform
Authors: Qian Kun , Wang Miao , Hu Ai Bang , Liu Guo Hao
Published: January 2014

In engineering design and construction, the adverse effect would be prevented, if we can estimate and consider the the foundation transformation and control or take advantage of it.Calculating the building foundation settlement. we should consider the influence of lateral deformation of foundation soil. In this paper we replace e-lgp curve with e-p curve on basis of the calculation theory foundation settlement considering three-dimensional transformation, it makes the calculation of foundation settlement more simplified and accurate.
Studying on Chinese Engineering Design Service Modes
Authors: Lu Guo Hua , Zhang Bei Bei , Cheng Hu
Published: January 2014

Based on analyzing the characteristics of engineering design enterprises, through investigating 30 Chinese design enterprises ,the present main engineering design service modes are summarized and analyzed, furthermore the backward management philosophy, lack of the efficient information feed back mechanism ,and no enough attention to the accumulation of knowledge are uncovered as the root causes of low innovation ability, the design defects, and extensive management in Chinese design enterprises. Under the great changes taking place in modern market environment, the Chinese engineering design enterprises are required to transform for complying with market demands and the world trend, so the life cycle design service mode is put up with the development strategies for the development of the engineering enterprises.
Job Stress and Job Satisfaction of Estimators in Korean Construction Company
Authors: Cha Sang Ho , Shin Yoon Seok
Published: January 2014

This study aims to elucidate the relationship between job stress and job satisfaction based on an assessment of those traits. To evaluate job stress and job satisfaction, a questionnaire survey of estimators in Korea was conducted, and a statistical analysis was performed. The analysis revealed the key job stress factors and job stresses that affect job satisfaction. It is expected that the findings of this research will contribute to improve the job satisfaction and job performance of estimators in Korean construction companies.
Validation Control of Construction Cost
Authors: Zhang Yong Gang , Wang Yong Hong , Zhao Yuan Yuan
Published: January 2014

Project investment is the most important factor in construction. Project-establishment, design, project bidding and construction phases are the basic stages in construction. According to different phases, scientific investment estimation method, cost engineers participating in design, realistic tender sum limit and strictly overall controlling are the validation methods. Eventually, realize the goal of controlling construction cost.