bluuebunny/crossref_metadata_2025 huggingface dataset:
Taper Roll Contour Design for Edge Drop Control of Non-Oriented Electrical Steel on Tandem Cold Rolling Mill
Authors: Yang Guang Hui , Zhang Jie , Li Hong Bo , Cao Jian Guo , Jia Sheng Hui
Published: June 2012

The taper work roll of the 1700 mm tandem cold rolling mills had some problems in the course of using, and the taper roll contour was ground difficultly and the difference between the designed contour and grinding contour was very big, and the work roll and backup roll had very serious and non-uniform roll wearing and even often had roll spalling, and above those problems affected the stability of rolling process seriously. After analyzing the structure and contour of the taper work roll, it was found that the work roll contour was designed unreasonably and the straight line part and the edge drop control part of roll contours were not connected smoothly, and so it lead to the local stress concentration easily in the transition region and a bigger contacting pressure peak between work roll and backup roll appeared. On basis of decreasing the contacting pressure peak and taking the width of rolled strip and the grinding contour length change into consideration, the design method of the edge control contour part of the taper roll was put forward. The finite element model was built with the software ANASYS9.0 to analyze the mill shape adjusting characteristics, and the simulation result showed that the newly-designed taper roll contour could improve the mill shape adjusting ability. It was shown in the rolling trial that the strip edge drop average was decreased from 14.9μm to 7.5μm and the edge drop fluctuation of strip was restrained to some extent and controlled within ±3μm.
Analysis of Hybrid Effect of Two Hybrid Fiber CGFRP Bar and its Mechanical Properties
Authors: Xu Xin Sheng , Dong Sen Lei , Xu Xiao Da
Published: June 2012

Using two or more different fiber mixed form high-powered composite reinforcement, through the control of the amount of fiber bundles, to "hybrid excellent", can not only ensure the tensile strength, and can effectively improve the toughness of the FRP bar . The paper based on the theory of the composite material hybrid effect of carbon fiber and glass fiber hybrid form the CGFRP bar hybrid mode, mixed ratio, hybrid effect analysis and research, this paper expounds the influence of the main factors CGFRP bar ductility, puts forward the CGFRP bar effect positive hybrid fiber critical size, stress-strain curve, tensile strength and elastic modulus calculation method, ensure the use of performance under the premise, and put forward the CGFRP bar design idea of reinforced concrete structure FRP ductility design, improve the safety of the structure provides an effective way.
Experimental Research on Ceramsite Concrete Beams
Authors: Du Chuang , Tian Wen Ling , Wang Xiao Wei , Wang De Jun
Published: June 2012

Six specimens, including 4 ceramsite concrete beams(one of beams mixed into the polypropylene fiber ) and 2 normal concrete beams, were tested to investigate the flexural behavior. The test results show that cracking load of ceramsite concrete beams is slightly smaller than the ordinary concrete beam and cracking load of ceramsite concrete beams has significantly improved after mixing into the polypropylene fibers. The ultimate load of ceramsite concrete beams are no less than ordinary concrete beam,and fibers have not effects on the increase of ultimate load. Load-deflection curves were compared,and the results show that stiffness of ceramsite concrete beam is less than ordinary concrete beam. Ductility of ceramsite concrete beam is poorer than ordinary concrete beam. Fibers improve the stiffness of ceramsite concrete beam. Cover thickness of concrete beam has little effect on the performance of ceramsite concrete beam.
Study on the Constitutive Model of Composite Materials in Elastic-Plastic Stage
Authors: Qin Huan Chao , Wang Ju Lin
Published: June 2012

Elastic-plastic properties of composite materials are an important part of the study on micromechanics. Based on the plastic strain of matrix, the elastic-plastic constitutive model of composite materials is presented in this paper, while considering the influence of the transient flexibility matrix on the flexibility matrix. In comparison with the experimental results, theoretical analysis of the presented model is validated.
Shaking Table Test on Unreinforced Stone Masonry Pagoda
Authors: Zhu Fei , Wang Feng Lai , Sun Xu Jie , Zhao Y.
Published: June 2012

Unreinforced stone masonry pagodas have great cultural value and should be detailed investigation its mechanical properties. These buildings were not designed to resist earthquakes in ancient China, at least not in the way of current methods. The objectives of this research were to understand the dynamic behavior of unreinforced stone masonry pagoda and its seismic performance. To accomplish these, a 1/12 scale model of China Dinosaurs Pagoda was constructed and tested on shaking table. The octangle model height is 3.96m, with aspect ratio of height to width is 2.93, both parameters exceed the stipulated limit of Code for Seismic Design of Building. The model built with the stones and motars similar to the prototype materials and the arrangements. Its dynamic behavior and seismic performance were tested on the shaking table towards the free vibration and three earthquake waves. The experimental program adopted in the research is explained in this paper.
Influence of the Initial Imperfection on the Buckling of Steel Member Wrapped by Carbon Fibre
Authors: Niu Peng , Yang Gang , Jin Chun Fu , Li Xinxiang
Published: June 2012

Based on Ježek method of computing the elastic-plastic buckling of the member under the axial compressive load and the bending moment, considering the initial geometric imperfection, the analytical expressions of calculating the ultimate load of buckling about the neutral axis with the maximum moment of inertia for an H-shaped member with flange outsides wrapped by carbon fibre are derived. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact of the initial geometric imperfection on the H-shaped steel member wrapped by carbon fibre under the axial compressive load and the bending moment are analyzed and the numerical solutions of ultimate bearing capacity are obtained. By compared with the values of the finite element method (FEM), it shows that the analytical method in this paper is valid. Compared the reinforced effect of the carbon fibrer to the perfection member with the defect member, we find that the former is higher than the latter. The results of the example also show that the presence of initial geometric imperfection reduces the ultimate bearing capacity of the steel member to a great extent. The influence of defect member gradually decreases when the given moment rises.
Analysis of Elasticity Solution of Bi-Direction Functionally Graded Piezoelectric Beam Subject to Voltage
Authors: Yang Y Z
Published: June 2012

This paper presents symplectic method for the derivation of exact solutions of functionally graded piezoelectric beam with the material properties varying exponentially both along the axial and transverse coordinates. In the approach, the related equations and formulas are developed in terms of dual equations, which can be solved by variables separation and symplectic expansion in Hamiltonian system. To verify advantages of the method, numerical examples of bi-directional functionally piezoelectric beam are discussed.
Monotonic Performance of Lightweight Concrete Shear Walls
Authors: Yang Xin Lei , Wang Hai Liang , Ren Quan Chang
Published: June 2012

In this study, a full-scale lightweight concrete shear wall was tested under monotonic loading, and overall behavior and failure mode of the test specimen was discussed. Results of this study will provide useful information regarding the performance of lightweight concrete shear walls and similar systems subjected to static lateral loads.
Axial Compression Test of RC Columns Consolidation with BFRP
Authors: Huo Bao Rong , Zhang Xiang Dong
Published: June 2012

12 RC columns were made, including nine RC columns wrapped with BFRP, three RC columns without any reinforcement, to conduct the comparative study of axial compression. The result shows that the bearing capacity of the RC columns reinforced with the fibers increases obviously.The displacement ductility factor increases, but its increase rate becomes slow with increasing layers of fiber cloth, so the most economical layer number is 3. Based on the confinement mechanism of FRP cloth and the calculation formula of the bearing capacity for common RC column, the formula of the bearing capacity for reinforced RC column with BFRP cloth is proposed. The result of calculation basically tallies with the number in experiment.
Numerical Investigation on Structural Behaviour and Curling Influence of Aluminum Alloy Bolted Connections
Authors: Kim Tae Soo , Jo Yong Hyun , Choi Yun Cheol
Published: June 2012

Numerical simulation is utilized to estimate the structural behaviors such as ultimate strength, fracture mode and curling effect of single shear bolted connections fabricated with aluminum alloys. In the Kim’s previous research, the validity of finite element analysis was verified through the comparison of test results and analysis results. In this paper, curling deformation and strain development between test result and analysis result were investigated. Also, additional parametric studies are performed for bolted connections with other variables of edge distance and end distance, which are not considered in the existing experiment. The conditions of end distance and edge distance for curing occurrence were discussed.
The Contrast Studies on High-Strength Bolts in Slip-Critical Connections between the Chinese and American Steel Structure Design Codes
Authors: Huang Cong , Pu Wan Li
Published: June 2012

In the design of steel structure, the requirements for the high- strength bolts in slip-critical connections are not identical in China and America. The Steel Structure Design Codes (GB50017-2003) is used in China, while the latest Specification for Structural Steel Buildings (ANSI / AISC 360-10) is used in the United States. In this article, requirements on the high- strength bolts in slip-critical connections in these two specifications are compared to find out the differences.
Experimental Studies on Seismic Performance of High Strength Reinforced Concrete Columns
Authors: Yang Wen Xing , Shi Qing Xuan , Sun Hui Xiang
Published: June 2012

This paper summarized an experimental study on seismic behavior of high strength steel reinforced high strength concrete columns under horizontal cyclic loading. Influencing factors of 14 columns included axial compression ratio, shape of hoops, shear span ratio, stirrup ratio, strength of concrete and stirrups, etc. Influence of seismic capacity and performance of columns by these factors were involved in. It indicates that high-strength stirrups could improve seismic capability of member availability.
FEM Analysis of Composite Structures for Plate-Cone Reticulated Shell
Authors: Wang Xing
Published: June 2012

Plate-cone reticulated shell is a new type of space structures with good mechanical behavior and technical economy. In this paper, the static characteristics for plate-cone reticulated shell are analyzed with Composite Structures FEM. Based on mechanical characteristics of plate-cone reticulated shell, three mechanical models are considered. A reasonable compute method for designing plate-cone reticulated shell working interactively is given, and a special computer program is developed.
Research on Baking System of Shale Lightweight Aggregates
Authors: Li Lin , Wang Qing , Wang Yu , Ding Zhao Yang
Published: June 2012

Lightweight aggregates is one of the component materials that affect the performance of concrete directly. This paper researches the high strength and lightweight aggregates through orthogonal test. It points out that apparent density, press strength and 1h water absorption of lightweight aggregate is 1360kg/m3, 6.8 Mpa, 4.1% respectively, which meet the national standards. Shale lightweight aggregates we prepared has the characters of high strength and lightweight. This work will receive highly economic and social benefits in use in the industrial waste residue synthetically and protect environment.
Stability Analysis of High Filling Slope Affected by Precipitation Intensity
Authors: Wang Wen Tao , Song Tao , Liu Zeng Rong
Published: June 2012

Aiming at researching on stability of slope affected by precipitation intensity, transient saturated-unsaturated seepage finite element method and slope stability finite element method are combined in this paper. Vadose field of slope is simulated in different precipitation intensity. Based on vadose field, the writers analyzed the stability of slope affected by precipitation intensity. The research results indicate that water is brought together in the interface first. Then the water level moves toward up and down respectively from the both sides of the interface. On the basis of saturated-unsaturated seepage theory, precipitation intensity has little effect on the slope stability in the first 6 hours after precipitation. After that, slope safety coefficient is relatively high when precipitation intensity is smaller, and vice versa.
Sensitivity Analysis of Loess Cave Dwellings’ Random Variables
Authors: Wei Yong , Guo Ping Gong
Published: June 2012

The relative sensitivity of loess cave dwellings’ random variables is researched. The random variables are divided to resistance terms and load terms. The structural response is analyzed on standard deviation intervals with every random variable, and the gradient of structural response on each standard deviation interval is used to evaluate the sensitivity of random variables. The random variables research of loess cave dwellings in Shan city, Henan province shows that, the sensitivity of cohesion and cave leg width are the biggest, and internal friction angle and span of cave are the smallest which can be treated as constant parameters.
The Reliability Research on Water-Sealed Conditions of Underground Water-Sealed Oil Storage Caverns in Guangdong Huizhou, China
Authors: Zhang Bin , Yang Bo , Jie Yu Xin , Kang Xiang Yang , Li Li Qing
Published: June 2012

Reliability of water-sealed conditions is crucial to the safety of water-sealed oil-storage. With a case study of underground water-sealed oil storage cavern in Huizhou, a reliability evaluation index system of water-sealed conditions is estabilished based on the main factors influencing water-sealed conditions. Also, a zonal evaluation of water-sealed conditions of the cave rock mass ranging from 0m to -70m is made by Fuzzy Analytical Hierarchy Process. Moreover, a three-dimensional numerical seepage model is established to study the seepage laws of the groundwater before and after the cavern excavation, and the water inflow during excavation and operation can be forecasted too. The results prove that the cavern site is suitable for the construction of large-scale underground oil storage caverns for its good water-sealed conditions and high reliability.
Laboratory Study on the Liquefaction Properties of the Saturation Structural Loess
Authors: Wang Qian , Wang Lan Min , Wang Jun , Ma Hai Ping , Zhong Xiu Mei , Wang Nai , Wang Jing
Published: June 2012

The structural property is an important influence factor in loess liquefaction, which contains the interaction between the soil granules. According to study by Gao, the loess could be divided into three types as weak cemented loess, half cemented loess and cemented loess based on the grain composition, the consolidation and the weather conditions of the loess when it formed. In this paper, based on microstructure test and dynamic triaxial test of the loess from the Loess Plateau region, liquefaction properties of structural loess was analyzed. The results show that: (1) the structural strength of loess of weak cementing type, half cementing type and cementing type increases in order, and so does the liquefaction strength, (2) the change mechanism of different structural loess’s dynamic strain during liquefying is different, (3) the change of saturation loess’s pore water pressure during liquefying is related to the type of pore and the structural strength.
Calculation Method of Surrounding Rock Pressure for Shallow and Unsymmetrical Tunnel under Deep Valley Terrain
Authors: Bai Zhe , Wu Shun Chuan
Published: June 2012

Code for design of road tunnel provides the calculation method of surrounding rock pressure for shallow and unsymmetrical tunnel, however, which has the applicable condition. Based on code method, the critical edge width is derived which need satisfy when using code method. Then, by assuming the retaining wall model, the analytical solution of lateral pressure for shallow and unsymmetrical tunnel under deep valley terrain is deduced. At last, taking Lijiabao tunnel belonging to Zhangzhuo highway as engineering relying and combining with the field measurement of surrounding rock pressure, the conclusion is drew by comparisons that the value from method in this paper is more close to the reality than the code method. The study results provide references with the design and construction of similar engineering and offers favorable supplement for the current code.
Numerical Analysis of Tunneling Influence on Settlement of Existing Pile Foundations Based on Orthogonal Design
Authors: Gao Yong Tao , Wu Qing Liang , Wu Shun Chuan , Ji Mao Wei , Chen Ai Ping , Wan Chen Ye
Published: June 2012

Because of the Limited urban space and the development of transport, underground space development, especially the metro construction, is vigorously developed in many cities. Subway passing through the existing building inevitably may cause the settlement and deformation of the buildings and their foundations. Therefore, research on the influence of tunneling on existing buildings has important significance. In order to study the influence of tunneling on settlement of existing pile foundations, soil elastic modulus, cohesion, friction angle, tunneling sizes, distance between tunnel opening boundaries and existing pile foundation etc. are discussed as analysis factors in this paper. The calculation schemes are designed based on orthogonal design, and then the influence of tunneling on existing buildings is researched according to the numerical calculation model which is established by the finite element software. Finally, the sensitivity of pile foundation settlement to various factors is analyzed according to the results of simulation analysis. we can draw the conclusions: the influence of tunneling on settlement of existing pile foundation is positively correlated with tunneling sizes, and is negatively correlated with soil parameters and distance between tunnel opening boundaries and existing pile foundations; The settlement of pile foundations can be effectively controlled by application of composite anchor isolation piles around the existing buildings piles, but with the increase of soil parameters and distance between tunnel opening boundaries and existing pile foundations, the strengthening effects are decreased; soil elastic modulus and excavation sizes are the key impact-factors of pile settlement within the distance of 5m between tunneling boundaries and existing pile foundations, which have extremely remarkable effect on the subsidence of pile foundations.
Research on Comprehensive Prediction of Rock Burst in Sanshandao Gold Mine
Authors: Li Zheng Sheng , Miao Sheng Jun , Ren Fei Hua
Published: June 2012

The paper takes the deep exploitation of Sanshandao gold mine as the research subject , the methods of distribution of rock structure and lithology examination, in-situ rock stress measurement, physical and mechanical tests of rock, and fuzzy mathematic prediction are used to study rockburst tendency in deep development and exploitation of the mine, which fill the gaps for the past using only one qualitative indexes of rock to judge the possibility of rock bust, and make the evaluation results more close to the objective reality.
Field Monitoring of Surrounding Rock Stress in Tunnel Construction
Authors: Dong Ying Na , Huang Qiang
Published: June 2012

The surrounding rock stress field monitor has been done in excavation by vibrating wire transducer. The field monitoring data are compared with numerical simulation results. The result shows: Vibrating wire transducer can record the stress variation of surrounding rock and support. Surrounding rock stress changes violently at every excavation step, such as lower bench excavation, the stress variation is mainly controlled by the spatial effect. When the distance from excavation face to the monitoring section is more than a tunnel diameter, the rock stress variation is mainly affected by time and it is relatively smooth and continuous.
Simulation Method of Tunnel Excavation under Plane Strain Condition
Authors: Niu Hong Tao
Published: June 2012

For a different supporting time hole into subway tunnel excavation, with the initial stress in the surrounding rock in the tunnel and initial stress reverse impose the same release the equivalent of the simulation node, consider themselves lining load conditions in a hole under the formation of linear elastic numerical solution. The analysis indicated that with the increasing of the stress release rate, the hole arch displacement gradually decrease. When the stress release rate is bigger than a value, the hole arch displacement is increase rapidly, this is a marginal value (the biggest permission release rate); Under the identical hole diameter condition, the burying depth is bigger, the biggest permission release rate is bigger; Under the identical burying depth condition, the hole diameter is bigger, the biggest permission release rate is smaller.
Design and Application of Secondary High-Capacity Support to Large-Section Tunnel Excavated in High-Stress Condition with Fractured Surrounding Rock
Authors: Chen Xin Ming
Published: June 2012

Aimed at the support problem of the deep large-section tunnel excavated in high-stress condition with fractured surrounding rock, the different characteristics of the stresses and displacements of the surrounding rock of the tunnel with different section supports and lateral pressure coefficients were analyzed using numerical simulation and theoretical calculation, so was the effect of the height of the double-layered I-section beam on the bearing capacity. Arched with bottom arch superimposed and fully-closed I-section beam suitable for large-section tunnel excavated in high-stress condition with fractured surrounding rock was developed. This support applies fully-closed and horse-shoe shaped structure with I-section beam overlapped and welded and its bearing capacity is 2.5 times higher than frequently-used I-section beam. Underground field testing showed that the deformation of the surrounding rock could be effectively controlled when the secondary arched with bottom arch superimposed and fully-closed I-section beam of high bearing capacity was used.
Influence of Cavity above Tunnel on Stratum Deformation and Failure in Urban Tunnelling
Authors: Zhang Yanan , Zhang Cheng Ping , Li Qian Qian , Li Zheng , Cai Yi
Published: June 2012

In order to study the influence of cavity above the tunnel on stratum deformation and failure in urban tunnelling, the model test method was adopted based on the parameters of the stratum and tunnel section size in Beijing subway. The stratum responses were obtained under the conditions without ground cavity and with ground cavity above the tunnel. The responses include the stratum stress distribution, stratum settlement law and stratum failure process. It was concluded that the existence of ground cavity above the tunnel worsened the stratum condition and accelerated the progress of stratum deformation and failure. Furthermore, the failure began from the cavity and the damage scope was bigger than that under the condition without cavity according to the test results. The research results can be referenced for the similar tunnel engineering.
The Tunnel of Small Interval Clip Rock Mechanics Properties Research
Authors: Zhang Ye Min , Li Wen Jian , Li Jin Cai
Published: June 2012

Abstract. In jiangxi red XiaShan highway tunnel interval for engineering background, the key research different scheme for tunnel construction process between them the mechanical behavior of rock and analyzed. For small interval double hole parallel tunnel between them the complex rock stress state, the finite element analysis software for using the numerical analysis method is buried deep in the condition of small interval period of bias by different construction scheme of tunnel numerical simulation. To meshshotcreting firstly method, CD method, up and down steps method, the construction method of different displacement and deformation of the stability of surrounding rock and the comparative analysis. Analyze the different schemes of before and after the surrounding rock tunnel excavation and supporting structure composed of each other of the unity displacement change rule. Put forward the tunnel between them weak rock the concept, more explicit the engineering geological conditions of weak rock tunnel clip to control surfaces. And on the basis of guidance for engineering construction, in actual construction which has obtained a better effect. The result is of a similar project design and construction to provide the reference and the model.
Numerical Simulation of the Effects of the Treatment to Rock Tunnel Collapse
Authors: Zhong Yan Hui , Zhang Bei , Peng Wen Kui , Guo Cheng Chao
Published: June 2012

Aiming at collapse in the excavation of tunnel in western Henan, the measures including cement grouting and leading conduit are proposed to be used in the treatment of collapse, and the processes of the treatment is numerical simulated. Comprehensive analysis shows that the broken surrounding rock strength has been improved significantly, and it worked fine after being treated.
The Stability Evaluation of the Landslide in the Northwest Sit of Certain a Substation
Authors: Guo Pei Xi
Published: June 2012

The landslide which located in the northwest of the transformer substation was studied and the evaluation of the stability was contained.Through analyzing the regional geological conditions and landslide engineering conditions, summary of the reason of the landslide was made. Based on two-dimensional rigid body limit equilibrium theory, residual thrust method was used in calculation. Through the researching of the landslide, some factors that play important role were found. According to the investigation report, select the main slip profile as the basis for calculating. Combining with soil C&φ, the value of the inversion parameters can be got. Calculation process contained two engineering conditions. In the natural condition, the landslide is stable, and in the rainstorm condition, the landslide is not stable.
Research on Formation Mechanism of Deep Cracks in Left Bank Slope of Jinping First Stage Hydropower Station Based on DDA Method
Authors: Sun Shao Rui , Gao Chang Quan , Liu Jia Ming , Lu Ye Xu , Xu Pen Lei
Published: June 2012

Deep crack of high slope in the deep-cutting canyon region is a special geological phenomenon which exists in hydropower engineering in the west of China. High steep rock slopes are usually chosen as action sites of dam abutment. However, many deep cracks are often discovered in the depth of these high slopes. And irrefutably deep cracks greatly influence the stability of the engineering. By taking the deep cracks of left bank in Jinping I hydropower station as an example, formation mechanism of deep crack in high slope is partially revealed in this paper. Deep cracks were result of release of high geo-stress including body stress and tectonic stress when external environmental condition changed (such as river valley deep-cutting). Geometry and mechanics characteristics of discontinuous are internal factors result in the formation of deep cracks; deep cracks maybe have stepped-up process when combination of discontinuous is unfavorable; and intense release of high geo-stress caused by valley deep-cutting is external factor. In this paper, different combination of discontinuous was analyzed, and the formation process of deep cracks was simulated by DDA method. It concludes that the formation of deep cracks go through a series of complex process including river valley stress concentration caused by intense unloading - the high slope tension crack caused by horizontal stress release- part of the tension crack rock mass generates shear-tension crack downward along the slope under gravity”, etc. Research on this subject is a theory support for excavation and reinforcement of high slope where deep cracks exist.
Numerical Simulation of Rolling Compaction Process for Rockfill Dam by Particle Flow Code
Authors: Liu Yang , Li Xiao Zhu
Published: June 2012

Based on field compaction test of Nuozhadu I district rockfill engineering, numerical simulation was conducted to study the rolling compaction (RC) process using Particle Flow Code (PFC). Effects of different particle content to the quality of dam filling were discussed based on both numerical and filed test results. Numerical results also revealed the particle movement of the rockfill, the density of the formation mechanism and compaction characteristics during the RC process. Field test and simulated results both indicated that the RC process can be divided into three stages of vibration compaction, void filling and the unloading rebound phase
Hydrological Frequency Calculation Method Study of Urban Rivers Runoff under Changing Environment
Authors: Yu Cui Song , Guo Xiao Na
Published: June 2012

The consistency of hydrological series has been destroyed by the impact of human activities and climate change. Hydrological series is consist of certain component and random element. The random and certain components of hydrological series are identified and separated through statistic analysis. The certain element is determined by using hydrologic model while the consistancy of random element is confirmed directly by hydrological frequency curve. And then add them together. The runoff series of the Huangtai Hydrometric Station in the Xiaoqing River is for example. It proves effective and feasible and the result accord with the reality of the basin.
Deformation Prediction and Inversion of Shuibuya Project Based on Artificial Neural Network and Genetic Algorithm
Authors: Cao Ling , Zhan Zhen Biao , Han Yong
Published: June 2012

he application of artificial neural network and genetic algorithm is made into the Shuibuya concrete face rock-fill dam project. At the beginning of design phase, genetic algorithm was used to predict the deformation of the dam; One year after the completion of construction, the rheological constitutive model parameters of Shuibuya concrete face rock-fill dam (CFRD) was inverted based on the monitoring data. And the permanent deformation of the dam was computed with the help of artificial neural network and genetic algorithm. The study result not only can accurately grasp the characteristic of Shuibuya CFRD, but also is propitious for the advancement of the computation theory about superhigh project.
Determination of Horizontal Deformation Monitoring Index for Powerhouse Dam of Feilai Gorge Project
Authors: Yao Hui Qin
Published: June 2012

According to the structural character of Powerhouse Dam of Feilai Gorge Multipurpose Project, this paper analyses the deformation regularity of the dam top of a typical dam section with the plane finite element method combined with strength reserve method. Then the horizontal deformation of the dam top of combination of different water level has been obtained. According a binary quadratic regression the model of the relation between the horizontal deformation of the dam top and the water level has been based, and the concrete data of this dam section has also been studied out. When the dam section runs and is being observing practically, these monitoring indexes of horizontal deformation can be consulted and provide important basis for monitoring the safe operation of the dam.
Dynamic Response of the Casing String in Seabed Soil for Deepwater Drilling
Authors: Su Kan Hua , Guan Zhi Chuan , Shi Li
Published: June 2012

The marine riser has transfer dynamic cyclic load to the top of casing string when deepwater drilling operating. Considering with the nonlinear characteristics of seabed soil, the variable string cross section, and the axial load on the top of string, a dynamic differential equation of casing string below mud line and its numerical solution were established. Results illustrate that, the lateral displacement, the bending moment, and the shear of the casing string are not equal when lateral dynamic cyclic loading achieves amplitude due to the soil hysteresis effect. The diameter and wall thickness of conductor have less affect to string vibration frequency, cannot adjust the string natural frequency by adjusting these parameters. The natural frequency of casing string in sand is bigger than it in clay. The undrained shear strength of soil has great effect on the natural frequency of casing string in clay. The lateral displacement amplitude is highest when the vibration frequency of casing string at its natural frequency.
Application of Dynamic Drainage Consolidation Method in Subgrade Strengthening
Authors: Yang Gui Hua , Xue Ru , Li Huai Qi
Published: June 2012

This paper introduces the application of dynamic drainage consolidation method in subgrade strengthening. Treatment result shows that the standard values of foundation bearing capacity are totally more than 120kPa，settlement of post –construction is less than 150 mm and differential settlement is less than 100mm，and the reinforced Depth of subgrade is about 9 m.
The Experimental Research on Beijing Subway Air-Conditioning System Energy-Saving
Authors: Zhang Wei Ya , Wei Jun
Published: June 2012

The subway is the major means of transportation in Beijing, and it also takes huge energy consumption. Now the consumption of a subway station is 9500 kWh every day, and the proportion of the air-conditioning system energy dissipation is about 64%, in which, a big part of that can be saved down to save and make full use of the energy. The key to the air-conditioning system energy saving is to put forward reasonable energy-saving schemes and feasible method. In this paper, with a subway station in Beijing as a test location，the measurement and data analysis are carried out, and the schemes put forward for energy conservation and emission reduction in subway air- conditioning system.
Review Status on High Temperature Heat Pumps
Authors: Zhou Guang Hui , Feng Shi Wei , Cui Si Qi , Liu Yin
Published: June 2012

A heat pump is a kind of energy saving equipment. It can effectively improve the grade of low temperature renewable and waste energy. Because of the increasing demands for higher temperature energy in many industrial processes and other fields, the development and research of high temperature heat pumps have been becoming more and more pressing and significant. This paper briefly summarizes the development status in two aspects: the development of working fluids and system features and characteristics of different cycle types.
Experiment Research and Design of a Field Test Device for Permeability of Pore Air of Unsaturated Soils
Authors: Xu Song , Zhang Fu You , Yuan Jun Pin , Chen Hong Wei , Gu Ming
Published: June 2012

Permeability of pore air is one of the main basic characters of unsaturated soil. Measuring it accurately is important in anti-seepage design. In this paper, a new kind of device was invented that could test permeability of pore air of unsaturated soil in situ quickly and accurately. With this apparatus, the relationship of air permeability coefficient with various dry densities and saturation of ground soils were obtained in a reservoir. Compared with routine indoor test, field test can decrease the disturbance to the soil and the result is more accurately.
Hydration Heat and Solar Radiation Effect Research of Box Girder
Authors: Yang Mei Liang , Ma Tang Ke
Published: June 2012

Combining construction monitoring of a PC continuous rigid bridge, research the effect of hydration heat in block number zero at construction stage and solar radiation effect in mid-span girder section at operation stage. In construction stage, central section of block number zero is observed for hydration heat effect and WZP-035 platinum thermistors is embedded for observing during the concrete deposit to 120 hours later. As observing, the maximum thermal gradient between inside and outside of box girder is 61.7 centigrade. On the other hand, the simulation result base on Ansys shows this maximum thermal gradient is 63 centigrade. In operation stage, the measuring point on the mid-span girder section is observed for continuous 17 hours under the high solar radiation and high temperature conditions. Ansys is also used to simulate the thermal stress in mid-span girder section. As a result, the stress concentration caused by the hydration heat and solar radiation should be highly valued.
Numerical Argumentation of any Factors for Effecting Flow Property of a Power-Law Gel Propellant in a Converging Injector
Authors: Xia Xue Li , Qiang Hong Fu , Guang Wang
Published: June 2012

To evaluate the effect of a converging injector geometry, volumetric flow rate and gallant content on the pressure drop, the velocity and viscosity fields, the governing equations of the steady, incompressible, isothermal, laminar flow of a Power-Law, shear-thinning gel propellant in a converging injector were formulated, discretized and solved. A SIMPLEC numerical algorithm was applied for the solution of the flow field. The results indicate that the mean apparent viscosity decreases with increasing the volumetric flow rate and increasing the gallant content results in an increase in the viscosity. The results indicate also that the convergence angle can produce additional decrease in the mean apparent viscosity of the fluid. The mean apparent viscosity decreases significantly with increasing the convergence angle of the injector, and its value is limited by the Newtonian viscosity η∞. The effect of the convergence angle on the mean apparent viscosity is more significant than the effect of the volumetric flow rate and the gallant content on the mean apparent viscosity. Additional decreasing the viscosity results in increasing the pressure drop with increasing convergence angle. It is important to injector design that the viscosity decreasing and the pressure drop increasing are took into account together.
The Potential Analysis of Natural Ventilation in Summer Climate Conditions in Five Typical Regions for Shandong Province
Authors: Qu Yun Xia , Pan Xue Liang , Luo Wan
Published: June 2012

The author analyzed the natural ventilation effective pressure differential and Pressure Differences Pascal Hours (PDPH) according to the meteorological parameters in the five region of Shandong province, for example, Weifang, Chengshantou, Longkou, Yanzhou and Jinan. Through a simulation for one typical building, the hours of effective ventilation in the room of Different location in this building and natural ventilation potential data is received
Test and Energy Consumption Analysis of Air-Conditioning Systems in Terminal Building of Guilin Liangjiang International Airport
Authors: Dai Ming He , Zhou Zhi Ping , Xue Xing
Published: June 2012

In this paper, the operating conditions of air-conditioning systems in Terminal building of Guilin LiangJiang International Airport were tested and analysed. This paper mainly analyzes the influence of chilled water temperature on water chiller performance and derives the relationship of COP of water chiller and chilled water temperature difference between inlet and outlet , and provides reference for operation mode’s optimization of the air-conditioning system and energy consumption reduction of the whole building.
Design and Implementation of Heat Exchange Station Control System
Authors: Zhang Huan , Shang Shu Qi , Yang Ran Bing
Published: June 2012

This paper introduced a design and implementation of heat exchange station control system based on PLC and industrial configuration software, including the control scheme and principle, hardware selection and software design, etc. The circulating pumps and replenishing pumps in the system can all be driven automatically by PLC and inverter. Main process parameters e.g. steam pressure and measurement temperature can all be shown on the industrial PC running configuration software, and instructions could be sent by the engineer and operator on-the-spot via the Human Machine Interface as well. The automatic pressures adjustment of steam supply of the heater by advanced PID algorithm has been realized finally. It is verified that the system is highly reliable and stable, and it greatly enhances the level of automation and pressure control accuracy of the heat exchange station and meets all the equipments running demands well.
Analysis of Building Hybrid Ventilation Efficiency in Different Climate Regions of China
Authors: Fu Xiu Zhang , Wu Ding Xin
Published: June 2012

Hybrid ventilation has significant advantages in building energy-saving. We discussed the potential and influencing factors of the rational use of building hybrid ventilation systems in three typical cities, located in three different climate regions of China. We used the Adapted Comfort Standard (ACS) model and Energyplus software to analyze the hybrid ventilation efficiency. This method combines the advantages of Degree-Hours Method and Heat Balance Method, and also takes into account the wind-driven and buoyancy-driven models. Results shows that the natural ventilation potential (NVP) utilization hours of high thermal insulation buildings with temperature control ventilation can be up to 5080h in Beijing, 6195h in Nanjing and 6726h in Guangzhou, accounting for 58.0%, 70.7% and 76.8% of the full year respectively. It means that the rational use of hybrid ventilation and ventilation mode can significantly reduce building energy consumption in summer.
Study on the Influence of Window Glass Ignition Temperature on the Heat Release Rate of CRH Passenger Rail Car
Authors: Chen Jun Min , Yao Xiao Lin , Li Shao Ping
Published: June 2012

The window glass ignition temperature is one of the main factors that determine the Heat Release Rate (HRR) of passenger rail car. In order to reveal the influence of window glass ignition temperature on the HRR of China Railways High-speed (CRH) passenger rail car, the HRR, ignition temperature and other thermal parameters of the individual materials and component assemblies of the CRH passenger rail car, are measured with the Cone Calorimeter, burning temperature tester and other instruments, as the input parameters of Fire Dynamics Simulator (FDS), and according to the different window glass ignition temperatures ,4 fire scenarios have been designed to obtain the HRR vs. time curves of CRH passenger rail car. The comparison results show that the window glass ignition temperature exerts a significant influence on the HRR of passenger rail car; if the ignition temperature is lower than 415°C, during the fire process the windows near the ignition source will be broken, and the back draft phenomenon will take place, resulting in the extremely high second peak HRR, about 22.6MW; if the ignition temperature is higher than 470°C, during the fire process all the windows will not be broken; and so it is suggested that the window glass ignition temperature in the passenger rail car should be higher than 520°C.
The Research on the Optimization of Surveying Engineering for Sustainable Development
Authors: Li Bao Long
Published: June 2012

We study the optimization of surveying engineering for sustainable development based on the parameterized distribution formulation and try to find out the way to realize the optimum surveying engineering for sustainable development. We used the parameterized distribution formulation for reference to establish the model system and we treated the compensation as the influential factor in this model system. Conclusion could be drawn that the optimization of surveying engineering could be realized for sustainable development by choosing the right influential factor.
A Creep-Damage Constitutive Model for Sandstone
Authors: Wang Wei , Lv Jun , Wang Hai Cheng
Published: June 2012

Based on the results obtained by the triaxial creep test, a creep-damage constitutive model for sandstone is presented by using the damage theory and by introducing the concept of “the whole process of damage” into Burgers creep model. The parameters of the model are determined by fitting the creep test data. The result shows that the proposed model can not only describe efficiently the variation of decay and steady creep under relatively low stress condition, but also give a satisfied representation of damage behavior in accelerated creep stage.
Research and Application of Grey Predictive Model Based on Wavelet Analysis
Authors: Xiao Hai Ping , Chen Lan Lan , Chen Yi Qiang , Guo Zhong Qun
Published: June 2012

It is the scientific basis of instructing the project to produce and operate that the deformation is monitored, and the analysis and prediction in constructing and operating of project is one of the important jobs. In order to analyze and predict the deformation of the project more timely and accurately, the paper analyzed and established the feasibility of wavelet-grey predicting model on the basis of the grey system theory in modeling limitations and the characteristics of wavelet transformation. With the comparison of predictive datas in two kinds of models, the results show, the predictive datas of the wavelet-grey model are more accurately than grey model’s, and has achieved good results in prediction of the engineering, is a feasible method.
Accuracy Control Technique of Vertically Matching the Curved Steel Tower
Authors: Jiang Min Wei , Cheng Xi
Published: June 2012

For solving the technical problem of accuracy control during manufacturing and vertically matching the curved steel tower of the bridge, this paper studies the accuracy control technique about it, as project example with the world’s first curved steel tower of No.3 Nanjing Yangtze River Bridge in China. Emphatically research the linear control during manufacturing and vertically matching the tower. Advance the conception of the accuracy control and build up an appropriate “Accuracy Control System” (ACS). Expound the contents of accuracy control, procedure and controlling means. Stress the research on the definition of the reference system of the tower, accumulated height error control, accumulated axis bias error control and accumulated torsion error control. Finally, in accordance with the results of accuracy control, give implement principle and method of manufacturing and vertically matching the tower. The check results show that accuracy of the control meets the design requirements and the research results are practical and reliable.
A Design of High-Accuracy Displacement Measurement Instrument from Principles of Optics
Authors: Chen Sheng Biao , Tan Yun Zhi
Published: June 2012

In order to measure the water drainage volume in soil mechanical tests accurately, it develop a new method which is based on principles of optics. And from both physical and mathematic aspects, it deduces the mathematic relationship between micro change in displacement and the increment projected on screen. The result shows that total reflection condition is better than refraction condition. What’s more, the screen could show the water volume micro variation clearly, so it can improve the accuracy of measurement.