bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Impounding Process Optimization of Cascade Reservoirs in Upper Changjiang River
Authors: Wang Dong , Deng Jin Yun , Li Yi Tian , Fang Juan Juan
Published: August 2013

Overlapping storage periods of the cascade reservoirs would lead to the unreasonable using of the water resources, and each reservoir in the cascade might not be filled, that would influence the comprehensive benefit of the cascade reservoirs. In this paper, the Runoff regulation model of the cascade reservoirs is established and verified, the flood regulating calculation of the Xiluodu-Xiangjiaba-Three Gorges cascade reservoirs is done, and based on the flood regulating calculation, the earliest dates of the starting impounding of the cascade reservoirs are as below: Xiluodu and Xiangjiaba reservoirs are both not earlier than Sep.11, and Three Gorges Reservoir is not earlier than Sep.1. Then by using the comparative analysis and based on an overall analysis of generating electricity and transport of the cascade reservoirs, the most reasonable impounding date are calculated as below: the Xiluodu reservoir starts impounding in Sep.1, the Xiangjiaba reservoir starts impounding in Oct.1, and the Three Gorges Reservoir starts impounding in Sep.1.
Stability Analysis of Green Revetment Media Using Hydraulic Model
Authors: Koo Bon Hak , Hyojin Kwon
Published: August 2013

Applicability and hydraulic evaluation of green revetment media which have improved physical structure are evaluated by the hydraulic model experiments. Results of the study on the relative erosion rates of base materials by the location of method and presence of vegetation, the green revetment had stability up to the limit of 1m distance, 1.5kg/m2 water pressure and 2 min of experimental duration. In addition, maintaining good rooting of vegetation would be beneficial to prevent erosion of revetment media during the flood as the resistance to the water pressure increases when the vegetation is applied in the river revetment.
Hydrodynamic Characteristics in a Valley Type Tributary Bay during the Raising and Falling Temperature Periods
Authors: Yu Zhen Zhen , Wang Ling Ling , Zhang Lei , Yang Yu Xia , Yan Li , Zhang Jian Jun , Yang Yong
Published: August 2013

The heat changes and distribution in water body provide one of the most important elements of structure influencing a host of chemical and biological processes. After the river-type reservoir was constructed, backwater entered into some tributaries, resulting in slow flow velocities in these tributaries. This paper made a reasonable description on the physical mechanism of hydrodynamic and water temperature distributions in a typical tributary bay, basing the hydrodynamic & water temperature coupled three-dimensional mathematical model. Through a large number of measured hydrologic, temperature and meteorological data, the paper simulated and obtained the hydrodynamic and water temperature distribution structure of the typical tributary bay and its evolution process, and described the hydrodynamic characteristics with precise values during the raising and falling temperature period; it is shown from the results that velocity vectors change displayed the water flow moved in a two-way circulation due to non-equilibrium warming and cooling on riverway cross-section, and the maximum flow velocity, turbulent kinetic energy and vorticity appeared on the surface water body, as well as wall near the tributary bay, and the turbulent kinetic energy is minimum on the center of tributary bay. The simulation experiment accurately captured the circulation phenomena caused by temperature difference, and proposed detailed distributions of flow field and related turbulent physical quantity, showed the strong coupling of flow field and temperature field change.
Macro Analysis on Alluvial Process of Typical Long Reach in the Lower Yangtze River
Authors: Liu Wan Li
Published: August 2013

Based on site investigation and annual survey data, the theoretical analysis method is applied to analyze the reach from Jiangxinzhou to Wujiang located at the lower reach of the Yangtze River. The characteristic of water flow and sediment and the macroscopic law of riverbed evolution are presented in this paper. In addition, the major factors influencing on the sandbar and beach evolution are also summarized. The results show that the riverbed evolution of the reach from Jiangxinzhou to Wujiang was caused by the linkage effects of main stream wandering near the Jiangxinzhou reach. The riverbed evolution of different waterways are interrelated and influenced with each other. Moreover, the main stream wandering at the inlet reach is one of the main reasons causing the riverbed evolution within the reach from Jiangxinzhou to Wujiang.
Onset of Triply Diffusive Convection in a Maxwell Fluid Saturated Porous Layer
Authors: Zhao Mo Li , Wang Shao Wei , Zhang Qiang Yong
Published: August 2013

The linear stability of triply diffusive convection in a binary Maxwell fluid saturated porous layer is investigated. Applying normal mode analysis , the criterion for the onset of stationary and oscillatory convection is obtained. The modified Darcy-Maxwell model is used as the analysis model. This allows us to make a thorough investigation of the processes of viscoelasticity and diffusions that causes the convection to set in through oscillatory rather than stationary. The effects of the parameters of Vadasz number, normalized porosity parameter, relaxation parameter, Lewis number and solute Rayleigh number are presented.
Analysis of the Zero-Pressure-Difference Point and Determination of the Pump Head in Distributed Power System
Authors: Fu Yong Zheng , Xu Ming Liu , Jiao Yang
Published: August 2013

Using pressure diagram to analyze the pressure distribution of distributed power system when the zero-pressure-difference point is in different positions. Conclusions can be drawn as follows: the zero-pressure-difference point should be between the critical point and heat source to eliminate the energy consumption of regulators. And as a result the transmission energy consumption of the system becomes lowest. When the zero-pressure-difference point is in different positions between the critical point and heat source, arrangements of pumps of the system are different. But the total output power of the pumps is the same. The zero-pressure-difference point and the schemes for pump head can be conveniently determined by graphical method like pressure diagram or numerical method.
Study on Water and Sediment Diversion Variations in Songzikou after the Three Gorges Reservoir Storage
Authors: Wang Dong , Li Yi Tian , Deng Jin Yun , Yang Yun Ping
Published: August 2013

Songzikou has the greatest diversion ratio among the three outlets at Jingjiang River. The water and sediment diversion ratios are changed after water storage of the Three Gorges Reservoir. The changing trends are critical for the evolution of the river-lake relationship. According to the water and sediment diversion data obtained from 2003 to 2010 in the Songzikou, it could be found that the water diversion ratios in the Songzikou under different Zhicheng flow are enhanced and its sediment diversion ratios also had an increasing trend after the Three Gorges Reservoir storage. The variations were mainly related to the water levels of main streams, the change of river regime and the diversion angle near the outlet. In addition, the changes were also associated with the evolution characteristics of outlet channel. We further studied how flood regulation of the Three Gorges Reservoir influenced the diversions of the Songzikou.
Seismic Response of Dam-Sediment-Water on Fluid-Solid Coupling
Authors: Yan Yi Zhi , Xiong Chang Xin , Su Zhi Min
Published: August 2013

Studying the important effects of sediments on the seismic response of dams ,This paper established the calculation model based on regarding the water reservoir as compressible fluid ,the dam and the foundation as an elastic solid, the sediment as Liquid-Solid two-phase porous medium. The results showed that the sediment thickness and properties have important effects on the dam seismic. Increasing the thickness of sediment ,the seismic response of acceleration significantly decreased, the hydrodynamic pressure significantly reduced , which is benefited to the safety of the dam.
Research on Elastocoast Revetment Wave Model Test
Authors: Zhong Hua , Zhang Bin , Wang Yu , Sun Jing Lu
Published: August 2013

Elastocoast revetment is a new slope protection structures. It has good frost heave adaptability. But it also suffers wave action when used for revetment works. In order to study its protective effect on bank slope, the Elastocoast revetments wave model test under wave action is made, and the cement mortar revetment comparative trail is made simultaneously. It is researched that the rule of wave reflectivity, wave run-up, bottom uplift and surface wave pressure. That offers theoretical basis and reference for structure design and guidance for engineering practice.
A Study of Turbulent Shear Stress on Fine-Grained Suspended Sediment Flocs Size in the Yangtze Estuary
Authors: Cheng Jiang , Pan Wei , Du Pan Jun
Published: August 2013

During the two surveys at both spring and neap tides in wet (July-August 2008) season, measurements of flow, turbulence, suspended sediment concentration (SSC), fine-grained sediment particle mean diameter (Dm) were carried out over 26 h that covered two M2 semidiurnal cycles in the middle north channel of the Yangtze estuary. The preliminary observations data show complex temporal and seasonal variation in estuarine flocculation of fine-grained sediment. In the high-turbidity and high-energy area of the Yangtze estuary, the flocculation processes indicate that the turbulence shear stress maybe the most important factor to the fine-grained sediment flocculation processes during the spring and neap tide cycle change. There exists a turning point of flocs Dm vs. turbulent shear stress. The neap tidal critical turbulent shear stress is around 0.1 Nm-2, much smaller that the spring tidal data of about 0.5 Nm-2.
Nonlinear Analysis of Vortex Induced Dynamic Response of Marine Riser
Authors: Lin Lin , Wang Yan Ying
Published: August 2013

Vortex-induced dynamic response is the most important issue influencing marine riser. This paper presents an investigation on the vortex-induced nonlinear dynamic response of marine riser subjected to combined waves,currents and platform movement. The in-line force was solved by Morison equation under combined waves,currents and platform movement while cross-flow force was solved by wake oscillator model. Updated Lagrangianmethod was used to solve the nonlinear problem.The governing equations were discretized by finite element method and solved by Newmark-β method in time domain. Influence of nonlinearity, comparisons of vortex-induced dynamic responses under different boundary conditions and different flow profiles were discussed.
The Three-Dimensional Dynamic Characteristics on the South of Subei Radiation Shoal Waters
Authors: Zhang Bei , Du Pan Jun , Zhang Hui , Fei Yue Jun , Xiao Wen Jun , Gong Mao Xun
Published: August 2013

Based on the high precision terrain datas , high resolution FVCOM(Finite-Volume Coastal Ocean Model) numerical model was established to simulation for tide current and study three-dimensional dynamic characteristics of the south of Radiation shoal waters. Result show that transverse circulation was easy to produce in channel and groove. The vorticity and helicity computation method was applied in the area for the frist time. Transverse circulation and helical flow characteristics of typical sections were preliminary studied, and result show the quantitative evidence for the existence of the Spiral flow.Deep groove is not always appear double reverse spiral flow structure, it changes with the main flow velocity. Shoal grooves appear, a main spiral flow structure, and show great adaptability to the terrain, which is the reflection of the spiral flow to the terrain maintain mechanism .
Retrieval and Analysis on the Sediment Concentration of the South Branch of the Yangtze Estuary Based on TM
Authors: Hao Jia Ling , Cao Tong , Zhang Zhu Jun , Yin Li Ping
Published: August 2013

Suspended sediment concentration is important index of water quality, and assessment coefficient of water environment. Remote sensing technology can overcome the shortcomings of conventional methods, such as low speed, long period, and scarce temporal and spatial data distribution. Thus it is meaningful to introduce remote sensing technology to monitoring suspended sediment. In this paper, two TM/ETM+ images of the Yangtze estuary were utilized, and based on review of available domestic and overseas remote sensing data of suspended sediment, also combined with analysis on the 21 samples of synchronizing collection on April 28, 2009 and 3 samples of synchronizing collection on March 26, 2000 at the same time of satellite passing through respectively, the inversion model of satellite quantitative data was setup correlated to suspended sediment concentration. Then the classification diagram of sediment concentration in the surface water at the South Branch of the Yangtze Estuary was drawn. This study gets the following conclusions:(1) TM4 band reflection coefficient is more related to surface sediment concentration, the correlation coefficient is 0.884. (2)Through the regression analysis, the quantitative remote sensing model is established. By the mode, using satellite picture, sediment concentration distribution map in study area is obtained. (3)The diffusion law of suspended sediment, the range of high turbid water region and the estuarine sediment transportation were further discussed from monitoring data, and its characteristic phenomenon were observed and the cause was also explained.
The Design on Bearing Platform Dewatering Well Location of the Main Pier in the Songhua River Bridge
Authors: Wang Hai Jun , Li Yong Xiang
Published: August 2013

By the study of construction of the bearing platform in the SongHua River bridge, and the actual site geology, hydrology and the corresponding norms,after the water drainage experiment, basing on this, to design dewatering well location. It was proved that the drainage scheme meet the need of the construction, both to ensure the construction of bearing platform of the main pier, but also save construction costs and speed up the construction progress.
Construction Skill of a Special-Shaped Column with Gradient Section in a Certain Project
Authors: Cheng Xian Feng
Published: August 2013

The whole roof system of a certain stadium supports the ring beam. Load is transmitted to lower structures through the special-shaped column of a ring beam. This article introduces the positioning alignment, design and construction of the formwork supporting frame as well as other construction skills of a special-shaped column with a gradient section under the curve ring beam.
Construction Technology of 7 Meters Long Deep Rock-Socketed Pile
Authors: Lu Peng Zhen , Feng Bin Bin , Zhao Li
Published: August 2013

In this article, authors introduce some aspects of construction of deep rock-embedded piles on steep slopes such as selection of construction programs, construction measures and matters need attention.
Research on Microstructure Statistical Model of Soil-Rock Mixture
Authors: Shi Chong , Chen Kai Hua , Wang Sheng Nian , Wang Hai Li
Published: August 2013

Abstract: Soil-rock mixture is one of the complex geological bodies, in which microstructure is critical to determine its mechanical property. So it is of great significance to establish a statistical model on the basis of statistical recognition of microstructure of this media. Digital images taken on-site and Autocad is used here to conduct recognition of soil and rock. Rock is equivalent to random polygon in this paper. Taking approximate ellipse as reference, the statistical characteristics of long axis,short axis ,flattening and boundary roughness can be obtained. A stochastic model is established on this basis. Biaxial compression test curves are attained by digital image model and rock stochastic model confirm the effectiveness of statistical model of long structure in soil-rock mixture and the method of stochastic media generation.
Model of Deep Foundation Pit Supporting Technology - Hanging Pit
Authors: Gao Qing Min , Jin Kai Chao
Published: August 2013

From the point of view of engineering application, this paper systematically discusses the characteristics of soil retaining, watertight aspects of retaining wall which combined mixing piles of waterproof curtain and bored concrete pile . Aiming at the shortcomings of construction process of the open caisson , this paper puts forward a new type of supporting technology of deep foundation pit - hanging construction technology for foundation pit supporting.It is security construction ,no effect on environment, low cost, and so on. The thesis introduces the technology principal, construction procedures and related points of the new construction technology.
Effect of Damping Ditch in Dynamic Compaction
Authors: Wang Ji Cheng , Liu Hong Mei , Yan Gao
Published: August 2013

Damping ditch was dug beside the underground pipeline so as to prevent housing from damage and reduce displacement of underground pipelines caused by dynamic vibration. Different damping ditches were simulated and field measurement was tested. Research shows that vibration and squeezing effect cannot be neglected, and damping ditch can decrease the vibration and squeezing effect. The deeper and nearer to the housing the damping ditch is, the better the damping effect is. The underground pipelines displacement is slight, when the damping ditch is between underground pipelines and tamping points and much closer to the former. Otherwise, if the damping ditch is considerably closer to the tamping points, the displacement is comparatively large.
Development of Concrete Construction Technology in Winter
Authors: Zhang Tong , Tian Shuai , Chen Hong Yan
Published: August 2013

Nearly twenty years, freezing damage prevention of concrete construction in winter, construction methods of generalized integrated heat storage, the third generation of water-reducing agent (Poly carboxylic acid sodium), the theory of critical maturation degree, composite antifreeze, the key and matching technology of concrete construction under negative temperature and so on are all emerging constantly. Development progress of winter construction technology is promoted. All kinds of technology and economic about construction methods in winter are compared in this paper. The selection basis of concrete construction methods in winter is provided for different conditions.
Design and Application of Lightweight Steel Residential House
Authors: Hou He Tao , Sun Yan Fei , Zhou Jian , Lv Zhong Long , Li Jing Jing
Published: August 2013

This paper presented a design of a steel residential house. H-shaped steel was chosen as the beam and column of the steel frame. End-plate joints and welding node joints were used to connect each other so that the structure could be constructed rapidly and conveniently. PK prestressed concrete composite slab was chosen as the floor and roof slab. PK slab could be produced in factory and dont need formwork assembling and setting and could reduce the amount of work on-site, and could shorten the period of construction effectively. Composite panels with steel truss reinforced concrete and bamboo reinforced ceramic concrete were chosen as exterior walls. Compared with aerated concrete block wall with external insulation, composite panels had the advantages such as lightweight, energy saving, rapid installation, less slit and small thickness of wallboard and better seismic behavior. Application of the technology made the steel residential house a lightweight, energy saving and rapid construction house.
Experimental Research on Coupling of Swelling Rock between Swelling and Creep
Authors: Fan Qiu Yan , Wang Mei Qian , Li Xian , Zhang Bo
Published: August 2013

Swelling rock has the properties of swelling and creep. Researches on coupling between swelling and creep have not yet been carried out. The expansive Paleogene mudstone is used to laboratory uniaxial compression tests, to find the coupling regularity between swelling and creep under different initial water contents, influent modes and loading methods. For coupling, the creep curves show similar characteristic of non-coupling. The creep deformation increases obviously and the long-term strength decreases comparing with non-coupling. With increasing initial water content, the creep deformation increases for coupling. The creep deformation increases with the enlargement of water-absorption area during the coupling creep. For single-stage and multi-stage loading, the creep regularity is similar to non-coupling. The sample will have a permanent residual deformation when unloaded at the second stable creep stage. The long-term strength of swelling rock is greater than the swelling pressure and the long-term strength is lower than that of non-coupling.
Study on Rural Water Security Problem and the Construction of New Countryside in Hebei Province
Authors: Meng Xiao , Wu Xian Bing , Zhang Wei Yun
Published: August 2013

Based on the understanding of the connotation of water security, firstly the connotation of rural water security is analyzed, and then the relationship between rural water security and new rural construction is discussed. Taking Hebei Province as an example, the main existing problems of rural water security in Hebei province is analyzed from the aspects of rural drinking water security, rural areas irrigation water security, rural drainage water security, finally puts forward some countermeasures for solving the problem of rural water security.
Application of Ant Colony Algorithm in Optimized Design for Drainage Systems
Authors: Peng Cai Hong , Pang Zhao Hui , Zhu Yong Zhong , Tang Kun Hao
Published: August 2013

Ant colony algorithm, as a new optimized design is introduced in the design of drainage systems. Compared this with manually algorithms on the basis of practical examples, it brightens a promising future in water supply and drainage design.
Water Supply and Consumption Structure Change and Water Demand Forecast in Northern Shaanxi
Authors: Dong Ying , Wu Xi Jun
Published: August 2013

This paper analyzed the water resources and its availability distribution regularities in Northern Shaanxi; and the change laws of water consumption and supply in 1980-2010; according to the relevant planning goal and various industry water standard, forecasted the Northern Shaanxi water demand in future. Result shows that 2020 and 2030 water demand respectively is 1.9×109 m3 and 2.6×109 m3 in Northern Shaanxi. So the 1.6×109 m3 of available water resources at this stage can't meet the future requirements.
Procedural Warning System Study on Irrigation Reservoirs
Authors: Guo Xiaona , Yu Cui Song , Cao Sheng Le , Zheng Cong Qi , Song Shao Wen , Zhuang Hui Bo , Chen Gan Qin
Published: August 2013

Warning lines of surface water, which are important parts of the red line of water resources control and development, have theoretical significance and practical value to comprehensive utilization and scientific management of water resources. Based on the use control line of three red lines, this paper proposed the conception of procedural warning firstly, and gave warning management method of irrigation reservoirs. In the case of the Douyazi Reservoir in Jiaonan, procedural warning lines were given with warning period of non-flood, warning management which supported utilizing water resources reasonably and efficiently with technical basis.
Detection of an Existing Local Loss in a Water Distribution System
Authors: Xiao Di , Liang Jian Wen
Published: August 2013

Water distribution system is one of the most critical facilities in cities, and is more fragile compared with other structures. Losses in a water distribution system are often existed before health monitoring is implemented. This paper proposes to detect an existing local loss in a water distribution system on the basis of optimal monitoring of water pressure. The local loss is assumed at different positions with different extents, and pressures at monitoring stations is calculated, and the loss is then detected by minimizing the difference between the calculated and monitoring pressures at the monitoring stations. The efficiency is validated by example analysis. It is shown that an existing local loss is more reliably detected in a water distribution system with optimal monitoring.
Development and Application of Water Supply Network Simulation Analysis Platform
Authors: Dong Shen , Lv Mou , Fei Jian Gang
Published: August 2013

Nowadays, the demand of people for urban water supply security is increasing. Meanwhile, the scale of water supply system is expanding and the topology is being more and more complicated. Aiming at these problems above, the technology of simulation modling and software development for urban water supply network is researched in this article. First of all, through studying the parameter testing technique, the load and change law of water consumption, the pressure distribution law, and the actual conveyance capacity of main pipes of the whole water supply network are accurately mastered. Correspondingly, the simulation database is built. On this basis, aiming at scientific operation and water quality protection, taking opening territorial water supply network of one city for example, the microscopic hydraulic model of water supply network of this area is built, meanwhile, the simulation analysis platform is developed, with the application of on-line monitoring technology. The platform which has well expansibility and utility has been applied to water supply network of an urban city.
Research on the Water Culture of Ziquejie Terrace and how to Protect and Utilize it
Authors: Deng Jun , Tan Xu Ming
Published: August 2013

The Ziquejie Terrace is one of the earliest cultivated terraces in the world, so it has important theoretical and practical significance to study its water culture for the protection and development. By on-the-spot investigation, interview and literature review, this paper reduces the Ziquejie terraces water culture as follows: efficient use of water resource, consciousness of water resource protection and scientific and reasonable irrigation area planning and management. At present, there are many problems existing in the Ziquejie Terrace area, such as soil and water erosion, runoff reduction and the shortage of irrigation water, environmental disruption caused by tourism development, terraced collapse, water culture facing destruction and other issues. To solve these problems, the paper proposed to study the contradictions between ecological protection and tourism development, between irrigation construction and water culture, and gived protection strategies.
Numerical Simulation of Cross-Ventilation in Buildings Affected by Surrounding Buildings with Different Separation Distances
Authors: Shui Tao Tao , Liu Jing , Ma Fei
Published: August 2013

In order to investigate natural cross-ventilation in buildings, computational fluid dynamics (CFD) with the DES model is applied. The aim of this paper is to investigate the influence of surrounding buildings on natural ventilation in target building under different separation distances. The simulation results indicate that surrounding buildings has a significant impact on airflow structure and airflow rate of the target building. The flow characteristics in target building is determined by the flow regime in street canyon.
Case Study of a Failed Slope of a Port in Southern China
Authors: Cao Yong Hua , Huang Chuan Zhi
Published: August 2013

Uniform safety factors are normally assumed in slope stability analysis and this assumption can influence the rationality of the analysis. New analysis methods were obtained based on Fellenius, Bishop and multi sliding surface method to study a failed slope of a port in southern China. The calculation results show that the safety factors of soft soil layers will be overestimated and the safety factors of hard soil layers will be underestimated if soil mass of slope vary widely in the strength. For the failed slope in this paper, the factors obtained with normal methods will be overestimated because of the hard soil layer of this slope.
Study on Effect of the External Wall and Windows Heat Load Ratio to the Total Heat Load on the Indoor Heat Comfortability
Authors: Wang Gang
Published: August 2013

To study the relation between the heat load ratio of the external wall and window to the total heat load and the indoor heat comfortability index PMV, putting up the numerical calculation to a radiator heating room. It gains the value of the PMV when the heat load ratio of the external wall and window to the total heat load is separately 0.2 and 0.8, 0.3 and 0.7, 0.4 and 0.6, 0.5 and 0.5, 0.6 and 0.4. And it draws the curve about the PMV and the different heat load ratio of the external wall and window to the total heat load. The curve shows that when the heat load ratio of the external wall and window to the total heat load is 0.4 and 0.6, the indoor heat comfortability index PMV is maximal.
Application of Water Pump Proportionality Law to Heating and Air Conditioning Systems
Authors: Fu Yong Zheng , Zhou Xiao Bei , Zhou Hong Dan
Published: August 2013

Make an analysis and points out that the engineering conditions of variable speed working condition of water pump in line with the proportionality law are as follows: non-back-pressure system, all parallel pumps changing speed synchronously (including a single variable speed pump system) and fixed pipeline characteristic curve. Energy saving effect analysis of variable speed pumps should be based on the energy consumption comparison of the pump variable speed control to other flow control methods in conditions of achieving the same flow, but not to the design working condition.
Analysis of Seepage Field and Stability of Clinosol Slope under Rainfall Infiltration
Authors: Yang Xi Yi , Guo Fang
Published: August 2013

In order to research on slope seepage field and slop stability under rainfall infiltration, this paper combines finite element with limit equilibrium theory to study. The results show that under rainfall, pore water pressure of the slope crest and slope toe in slope wash is greatly influenced by rainfall; Change in the volume moisture content is more sensitive than pore water pressure, volumetric moisture content of each location is increasing quickly at the initial stage of rain, volumetric moisture content in the lower locations is the first to reach saturated due to the continued supply and gravity of the rain; The slope stability reduces with rainfall infiltration, the greater the rainfall intensity, the more obvious decline the slope safety factor.
Influence of Geometry Parameters on Critical Heat Flux in Helically Coiled Tubes: Development of Correlation
Authors: Ji Cui Lian , Han Ji Tian , Chen Chang Nian , Dong Xia , Kong Ling Jian
Published: August 2013

Based on 2006 look-up tables to analysis the effect of pipe diameters on CHF, the correlations are established for horizontal helically coiled tube by introducing equivalent geometrical parameter. According to experimental data, it is found that the correlation is very suitable, and the regularity of horizontal helically coiled tube geometry parameters on CHF tends to be consistent with that of a vertical tube.
An Experimental Study on the Application of Seamless Prism Light Guide
Authors: Li Wei , Zhao Guang Ke , Na Yan Ling
Published: August 2013

In this paper, a special lighting system that uses seamless prism light guide as main lighting component and application of the system in a high-humidity room is introduced. Experimental results show that the illuminance level and uniformity in the room has been improved greatly by the application of the guide. The average horizontal and vertical illuminance on main working plan created by the seamless light guide system is individually 74.1% and 101.8% higher than that created by the original lighting fixtures. The application of the seamless light guide system also makes the maintaining work become easier and safer.
Ecotect-Based Light Environment Simulation for Supporting House Design
Authors: Zheng Ting Ting , Zou Jia Min
Published: August 2013

The building interior light environment simulation, has been a difficulty in the traditional architectural design, Ecotect software can do a real-time analysis on building indoor light environment in the design stage of the building program, helping us to construction a green, energy-saving and comfortable modern architecture.
The Design of New Technology System in the Intelligent Building’s Lighting
Authors: Cai Jia Xing , Zhu Zong Jiu , Chen Jie , Fan Ming Ru
Published: August 2013

The lighting system uses the illumination detection module composed of a photosensitive sensor and the capacity detection module made up of a battery capacity sensor to collect the analog signals, which are sent to the SCM for the further arithmetic processing after converted to the digital signals by the chip of ADC0809, and then the SCM chip controls the connection and disconnection of the electromagnetic relay switches in order to intelligently choose one of the three lighting methods, fiber optic lighting, solar cell power lighting or the city power lighting. It has the advantages of energy saving and environmental protection, which also has a good market prospect because of its excellent practical applicability.
Parallel Cellular Element Method in Soil-Rock Mechanics
Authors: Yang Jing Nan , He Xiong Jun
Published: August 2013

A new soil-rock mechanics method—parallel cellular element method is introduced. In this method the integer analysis of structure is changed into a series of part analysis by using the idea of Cellular Automata. It may have a good future in soil-rock mechanics. The basic principle is introduced; the computing steps and results are presented. Based on the numerical results, the feasibility, advantages of cellular element method are discussed.
Improved Moment Distribution Method and its Application
Authors: Liu Shu Zhi
Published: August 2013

Change the general idea of the moment distribution method to analyze problems,not repeat fixed and relax joints to achieve a balance moment, but by the correction of the bending stiffness,deduced the moment carryover factor,moment once distributed and transferred twice you can get the moment exact solution.. Particularly suitable for the calculation of continuous beam internal forces and determination of envelope diagram and the influence lines of beam.
Mechanics Research on Rock Stress and Deformation of Lancang River Canyon's Large - Scale Dumping Deformation
Authors: Ye Song , Li Yu Sheng , Guo Qian
Published: August 2013

This article is based on geological surveys combined with finite element and discrete element numerical simulation methods. In-depth analysis of the complex geological structure, deformation characteristics and stress - deformation problems of dumping rock, we clarify different deformation characteristics of deformable landslide inside, at the bottom and the deep part of trailing edge, and demonstrate the deformation will gradually shift from dumping to shear slip. Potential deformation failure mode will be dumped into the whole sliding - tension, which is controlled by the bottom broken belt, and potential deformation is mainly subject to the bottom fault F207-3 of deformed rock and the dumping broken belt at the deep part of trailing edge.
Extended Finite Element Analysis of Crack-Void Interaction Problems in Viscoelastic Materials
Authors: Zhang Hui Hua , Zhou Dong Feng
Published: August 2013

Due to the incorporation of enrichment functions in the displacement approximation, the mesh in the extended finite element method (XFEM) can be independent of the internal discontinuities. In the present paper, crack-void interaction problems in viscoelastic materials are investigated with the XFEM. The effect of the distance between crack and void on crack opening displacement is mainly studied in time domain.
Study of Flow Characteristics of Oil and Water in the Process of Stirring
Authors: Hao Zong Rui , Xu Juan , Bie Hai Yan , Zhou Zhong Hai
Published: August 2013

To study the flow pattern in the process of oil-water stirring in three paddle stirring tank, RNG k-ε turbulent model and VOF model are adopted to simulate the flow field at different time in the stirred tank with the baffle. The results showed that, in the stirring process, inverted cone manifold was formed in the center of the stirring shaft. The stratified area was formed in the baffle and gradually transported to the bottom of the tank. The two circular flows were formed among three groups of blades. And the axially acting of the fluid was strong, which made homogeneous stirring in the stirred tank. At the same time the radial flow of the cross-section inside the tank increased because of the baffle.
Analytical Method for Plate Theory-Based Calculation of Bridge Transverse Load Distribution Coefficient
Authors: Wang Bai Ying , Liu Han Bing , Zhang Peng , Niu Yan Feng , Jiao Yu Bo
Published: August 2013

The most widely used calculation method for bridge transverse distribution coefficient based on plate theory is G-M method. The twisted parameter and bending stiffness parameter are firstly obtained in its calculation process, the distribution coefficient can be determined through inquiring the tables established by Guyon and Massonnet. The work for this computation is huge and the errors are inevitably exist in the stage of inquiring tables. Therefore, an analytical method is proposed in this paper, the partial differential equations of deflection surface can be acquired through analysis and corresponding calculating program is prepared. Numerical simulation of simply supported bridge is presented for validating its feasibility.
A Quasi-Greens Function Method for the Bending Problem of Simply Supported Polygonal Shallow Spherical Shells on Pasternak Foundation
Authors: Li Shan Qing , Yuan Hong
Published: August 2013

The quasi-Greens function method (QGFM) is applied to solve the bending problem of simply supported polygonal shallow spherical shells on Pasternak foundation. A quasi-Greens function is established by using the fundamental solution and the boundary equation of the problem. And the function satisfies the homogeneous boundary condition of the problem. Then the differential equation of the problem is reduced to two simultaneous Fredholm integral equations of the second kind by the Greens formula. The singularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation. The comparison with the ANSYS finite element solution shows a good agreement, and it demonstrates the feasibility and efficiency of the proposed method.
The Study of Explicit Scheme of Hybrid Stress-Function Element with Rotation Degrees of Freedom
Authors: Ge Li Na , Tian Ge , Yuan Ming Wu , Song Meng Yan , Fu Xiang Rong
Published: August 2013

A simple and efficient explicit scheme of triangular planar element with rotation degrees of freedom is proposed in this paper. The basic fundamental solutions of plane elasticity problem based on Airy stress functions are used as trial functions to construct triangular element with drilling degrees of freedom. During the construction of element model, the explicit expression of element stiffness matrix is deduced by means of triangular area coordinates integration method, instead of numerical integration method. Numerical calculation indicates that the element constructed in this paper is of high precision but less computational cost.
Relationship between Bending Solutions of FGM and Homogenous Circular Cylindrical Shells
Authors: Wan Ze Qing , Li Shi Rong
Published: August 2013

Based on the Loves shell theory, relationship between bending solutions of functionally graded materials (FGM) and homogenous circular cylindrical shells was studied. By comparing the displacement-type governing equations for axially symmetrically bending of FGM and homogenous circular cylindrical shells, an analogous transform relation between the deflections of FGM circular cylindrical shell and those of homogenous one was obtained. By giving the material properties of FGM circular cylindrical shell changing as continuous functions in the thickness direction, the corresponding transition factor between the solutions of the two kind circular cylindrical shells were derived, which reflect the non-uniform properties of the functionally graded material circular cylindrical shell. Numerical example shows that the numerical solutions of the maximum of non-dimensional deflections are almost in agreement with the transformational solutions whennequals approximately 5, wherenis the volume fraction index. As a result, solutions for axially symmetrically bending of a non-homogenous circular cylindrical shell can be reduced to that of a homogenous one and the calculation of the transformation factors.
Multi-Domain Analysis by FEM-BEM Coupling and BEM-DD Part I: Formulation and Implementation
Authors: Elleithy Wael
Published: August 2013

Several existing interface relaxation methods for finite element–boundary element coupling (FEM–BEM) and for boundary element–domain decomposition (BEM–DD) are reviewed. Furthermore, an interface relaxation method for BEM–DD is presented. This is Part I of two papers. In Part II, the convergence conditions of the interface relaxation FEM-BEM coupling and BEM-DD method are established. Example application is given for elaboration
Shape Effects on the Undrained Uplift Capacity of Skirted Suction Foundations in Clay
Authors: Fan Qing Lai , Luan Mao Tian , Chen Rong
Published: August 2013

Skirted suction foundations are an attractive solution for floating offshore wind turbines that are subject to uplift due to overturning or buoyancy loading. Current industry design guidelines give conservative collapse loads for offshore shallow foundation systems, particularly due to neglecting the beneficial effect of suction developed within the soil plug during rapid uplift. The behavior of skirted rectangular and circular footings subjected to uplift loading has been studied using centrifuge model tests and upper bound plastic limit analyses. Results demonstrate that the shape effects on the uplift capacity factor are not significant when the circular and rectangular footings both obey reverse end bearing failure mechanism. Simple predictive methods based on existing bearing capacity theory are provided.
Bending and Moment Stability in Reel Mechanisms
Authors: Mustaffa Zahiraniza , Taufiq Mohammed Badri , Albarody Thar M. Badri
Published: August 2013

This paper is examining the instabilities of reeled pipelines during spooling of initially straight or laying of initially bent pipe and sifting parametrically number of reel lay mechanisms. A combination of composite materials is studied and number of bending stability cases (i.e., ovalization and bifurcation buckling) is discussed. It is demonstrated that composite pipeline exhibit more stability than Steel pipes. The bending stability of spooled pipeline is examined in detail and, in particular, the case on the diameter drum of the reel lay system. Moreover, results on the strain energy release in the reel lay system are presented, extending the findings of previous works on controlling the spooling or laying mechanism.
Numerical Study on Airfoil Diversion Technology Used in Saving Energy by Air Injection on Large Ship
Authors: Qing Ye , Dong Wen Cai , Ou Yong Peng
Published: August 2013

The power consumption is too large when the method saving energy by air injection is used on large ship because of the deep draft. The feasibility and some key matters of the implication of airfoil diversion technology on air lubrication ,such as the attack angle, the distance from the airfoil to the plate and the position of the air injection, was investigate by a numerical method. The result shows that the pressure of the air injection entrance is significantly decreased by setting an airfoil at the air injection entrance reasonably, the pressure of the plate surface declines when the distance from the plate to the airfoil is decreasing and the attack angle is increasing, however, the resistance became larger. For the airfoil 2032cjc we investigated in this paper, when d/C=0.3, the attack angle range from 6°~8°,the pressure reduces comparative large and the resistance increases small. The best position for air injection is determined by the position and attack angle of the airfoil.
Numerical Analysis of Viscous-Spring Artificial Boundary Element for Underground Explosion
Authors: Song Juan , Li Shu Cai
Published: August 2013

Based on the dynamic viscous-spring artificial boundary and explicit finite element code, a numerical simulation of explosion process with concentrated charge in a mass of soil was carried out by using viscous-spring artificial boundary element. The results were compared with viscous boundary and far-field boundary based on dynamic response of soil medium and the explosion wave propagation law in soil. The results show that equivalent viscous-spring boundary element effectively reduce the boundary effect and has high solution precision and efficiency for simulation of blasting in soil.
Energy Flow Finite Element Analysis of L-Shaped Plate Including Three Types of Waves
Authors: Niu Jun Chuan , Li Kun Peng
Published: August 2013

Bending, longitudinal and shear waves being taken into account, the transmission and reflection coefficients at the junction of the L-shaped plates are investigated. Based on a special procedure to deal with the global matrix assembly, the wave energy governing equations are proposed to calculate the energy density and intensity of the coupled plates to investigate the transmission properties. Some conclusions are obtained by the numerical examples.
Analysis on Bearing Capacity of CFG Pile Composite Foundation in Baotou
Authors: Wang Ying Hao , Feng Yu Qin , Li Shuo
Published: August 2013

By uniting composite foundation with CFG pile composite foundation for a practical engineering project in Baotou, the bearing capacity of CFG pile in sandy soil and silty soil foundation were analyzed. The conclusion can be applied to the similar projects in the region of Inner Mongolia.
The Finite Element Model Updating Based on Multi-Case Displacement Measurement
Authors: Liu Ye Yan , Xiao Jun , Zhang Yu Xin
Published: August 2013

Elastic modulus is an important parameter in structural analysis. This paper identifys the structural elastic modulus with measured displacements, which is an inverse problem. The improved genetic algorithm combined with multi-cases measurement is applied in the solution. Numerical examples have proved that the method is available.
Comparison of Different Grid Structures for the Hydrocyclone Flow Field Simulation
Authors: Guo Guang Dong , Deng Song Sheng , Hua Wei Xing
Published: August 2013

In the CFD(computational fluid dynamics) study of hydrocyclones, the grid is a important factor to predicting the flow field. An attempt has been made in this study, in the same turbulence model and boundary conditions, three different structures of grid, the structured grid, the unstructured grid and the hybrid grid, are compared for the predictions of the axial, radial and tangential velocities. It has been observed that the memory space structured grid is large, and there are much number grid of the unstructured grid. The structured grid led to an improved turbulence field prediction and thereby to predict the velocity fields of single phase flow field more accurately. The unstructured grids is used to simulate the process of oil-water separation.