bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research of Bituminous Mixture Water Stability Based on Aggregate Cleanness
Authors: Guo Xue Dong , Gao Chun Mei , Wang Hao , Zhang Ming Liang
Published: June 2011

Water stability of bituminous mixture, whose sediment concentration of coarse and fine aggregate are respectively in 1%, 2%, 3%, 4%, is tested and analyzed; meanwhile, under the condition of vacuum saturation, the water uptake and the residual water of bituminous mixture, whose sediment concentration of coarse and fine aggregate are respectively in 0%, 2%, 4%, are also tested. Based on the test, the tensile splitting strengths are analyzed, in correspondence to different water rates. Results show that the water stability of bituminous mixture reduces as the aggregate sediment concentration increases, and its influence on the cleanness to the fine aggregate is more sensitive than on the coarse aggregate; the ability of water uptake increases as the aggregate sediment concentration increases; residual water approaches to stability with the extension of time. However, the higher the sediment concentration is, the higher residual water ratio will be as it approaching to stability. For clean aggregate, when the ratio of the residual water reaches 50%, its splitting strength appears to be the lowest; but for the unclean aggregate, when its splitting strength is in the lowest, the rate of residual water would rise to above 75%.
Theoretical Study on Similarity Relation of Small Scale Subgrade Shaking Table Test Model
Authors: Li Jin Bei , Zhang Hong Ru , Li Zhi Qiang
Published: June 2011

Shaking table test is an important method to study seismic performance of geotechnical structures. Processing the similarity relation and deducing the response of original mold correctly are very important. Based on similarity theory, the paper adopts a dimensional analysis method to solve almost all similar constants, and provides a practical method on designing subgrade model of shaking table test. During the model designing process, several basic similar constants are defined at first and other main similar constants are obtained according to the basic similar constants. This method is applied in practical earthquake simulated shaking table test. Partial results are compared with the theoretical calculation result. The experimental result which is in concordance to the theoretical calculation result can reflect the seismic response rules of subgrade correctly. So the practical designing method is feasible.
Experimental Study of Fly Ash Activator in the Application of Aeolian Soil
Authors: Zhang Xiang Dong , Liang Yun , Yue Yan
Published: June 2011

In order to save energy and reduce the pollution of the environment at the same time reduce construction costs, unconfined compression strength of Roadbed-stabilized soil tests are proceed on the base of potential stimulate agent inspired by fly ash and equal quantity replace the cement as the pavement materials use theory of uniform design . Then contrast tests of different level use of exciting agent are proceed. Regression analysis are put down to the results by using SPSS. Optimum mix of cement, fly ash, gravel and aeolianite are obtained when they have same activator. And then the dosage of fly ash are obtained through large number of contrast tests. The results shows that take Cement Fly-ash as the pavement materials is possible in some aeolian soil area where natural sandy gravel lack. It also provides a reference value in the selection of subgrade materials in aeolian soil area.
The Distortion Analysis on Semi-Rigid Pavement Structure under the Wheel Load
Authors: Gao Jian Hong
Published: June 2011

Based on the multi-layer elastic system model, a large general used finite element software is used to analysis in the paper. The conclusion of the most distortion lying the wheel load center and the law of the distortion with basal layer rigidity & thickness change are elicited. Above contents show the finite element method possesses extensive using foreground in the pavement structure analyse.
Model Tests on Working Performance of Geogrid Reinforcement Influenced by Differential Settlement
Authors: Wang Yi Min , Yi Hao , Li Qing Zheng
Published: June 2011

Based on the designing scheme of highway widening project, a serial of model tests were conducted to simulate the performance of geogrid reinforced widening embankment influenced by subgrade differential settlement. Totally, 6 models including no-geogrid reinforcement embankment, geogrid reinforcement embankment, differential settlement of 0mm, 20mm, 30mm, and 50mm between existing subgrade and newly widening subgrade were built. The differential settlement distribution of embankment and stress performance of geogrid on each model were tested and analyzed. The test results show that geogrid reinforcement can effectively decrease the vertical deformation of embankment which with load on the top. The heavier the load, the more effective the decrease of vertical settlement. Meanwhile, the geogrid can significantly adjust the distribution of settlement along the cross-section direction of embankment to less differential. The geogrid at the connection area of existing embankment and newly widening embankment receives the biggest tension stress under the subgrade differential settlement. It is suggested that a solid connection between geogrid and the existing embankment is very important for getting a better geogrid reinforcement effect on decreasing the differential settlement between existing embankment and newly widening embankment.
Test Research of Geogrid Reducing Pavement Rutting on Soft Foundation
Authors: Zhang Zhuo , Yang Xi Wu
Published: June 2011

The interior prototype rutting test is designed to research the effect of geogrid on reducing rutting. Three models are studied, which include unreinfored, Telegrid JBS20 and Tensar SS30. The change trend of rutting and the influence of differential structure geogrid on rutting are analyzed to evaluate the effect of geogrid on reducing rutting. The results of the tests prove that the geogrid reduce pavement rutting on soft foundation effectively, SS30 with higher node intensity and rigidity obviously exceeds JBS20 with higher tensile strength on the effect of reducing rutting, and the effect on reducing rut is not very good by improving tensile strength of geogrid.
Application of FBG Sensors in Flexible Pavement Monitoring
Authors: Geng Li Tao , Ren Rui Bo , Zhong Yang , Xu Qian
Published: June 2011

It’s an effective method for measuring and monitoring of structure response of asphalt pavement with sensor to evaluate materials performance and to verify the validity of mechanical model. In this paper, a real-time system is established with FBG temperature and strain sensors. The strain of pavement structure caused by static test, the temperature fluctuation and the strain caused by air temperature variation are monitored with this system. The analytical results were derived by transfer matrix method based on the measured data and then were compared with the monitoring ones. The agreement of experimental observations and calculative results shows the feasibility of FBG sensors in temperature and strain monitoring of asphalt pavement structures and the validity of mechanical model.
Experiment and Mechanism Study on Effect of Water/Binder and Fly Ash on Mechanical Properties of HPC
Authors: Li Shuang Xi , Xu An Quan , Tang Xin Jun , Hu Quan
Published: June 2011

It takes on the technical and economic double benefits that fly ash taking the place of cement. However, water/binder of modern concrete is generally low; the research on the concrete performance which is based on large water/binder is no longer suitable for analysis of modern concrete. As to this problem, using different proportions of W/B and FA dosage as influencing factors, specimen is compounded for the compressive strength test. Then, mechanical properties of HPC are studied systematically. Based on this, macro-performance is analyzed from a micro-mechanism point of view through taking the electron micrograph. As the study shows, strength of HPC mixed with fly ash has low characteristics at early period while high ones at later period. At later hydration, fly ash effect plays a significant role, the growth rate of concrete strength increases as the increase of FA dosage. Compressive strength of concrete decreases as the increase of W/B and FA dosage. When the W/B is high, compressive strength is not sensitive to the change of W/B and FA dosage; but when the W/B decreases from 0.30 to 0.25, the concrete strength transition occurs. The influence of W/B on concrete compressive strength is more significant than that of the FA dosage; in the preparation of HPC, fly ash can be added more and cement is added less relatively by decreasing the W/B, displaying the role of micro-aggregate filling and modification, improving the strength and other performance of concrete. The study on micro-mechanism proves well the macro-phenomena above.
Research on Physical and Chemical Behavior of Crumb Rubber in Asphalt Rubber
Authors: Ding Zhan , Jiang Jun , He Shao Ying , Shen Cheng
Published: June 2011

Waste rubber is a typical black pollution. Producing asphalt rubber with crumb rubber is an effective way of reducing the pollution and resource utilization. The swelling and degradation degree of crumb rubber in the asphalt is a main factor of the performance of asphalt rubber. In order to study the physical and chemical behavior such as swelling and degradation, the influence of crumb rubber on the viscosity of asphalt rubber under different conditions was analyzed. And the microscopic changes of the crumb rubber were discussed by the micrographs. Test results indicate that the viscosities of asphalt rubber are increasing with the increase of the producing temperature and the dose of crumb rubber. And the viscosities are increasing firstly and then decreasing with the size decrease of the crumb rubber. The viscosity of asphalt rubber is the maximum with 60-mesh crumb rubber. The microwave can significantly improve the swelling and degradation degree of crumb rubber in the asphalt. The micrographs show that the microscopic states of crumb rubber are different in the asphalt under different conditions. The crumb rubber may only swell or swell and degrade at the same time.
Temperature Stress Analysis of Concrete Overlay on Old Asphalt Pavement
Authors: Wei Lian Yu , Wang Kai , Li Shi Ning , Ma Shi Bin , Wu Yang Feng
Published: June 2011

Temperature is one of the most important factors affecting the design and performance of both flexible and rigid pavements. The functional as well as the structural performance of flexible and rigid pavements is highly dependent on the temperature regime to which these pavements are exposed. Temperature variations within pavement structure contribute to distress and possible failure of that structure. According to pavement temperature stress calculation principle, based on general finite element software ANSYS, the paper adopt three-dimensional finite element method analysed temperature stress in concrete overlay on old asphalt pavement,in which discussed influence law of overlay thickness and modulus, equivalent rebound modulus on base course top and overlay structure parameters to temperature stress, providing theoretical principle and basis for old asphalt concrete pavement overlay method base on reliability.
Reliability Analysis of Asphalt Pavement Structure Based on Three-Dimensional Finite Element
Authors: Ma Shi Bin , Wang Kai , Wu Yang Feng , Wei Lian Yu , Zhang Ming Wei
Published: June 2011

The design of asphalt pavements in china is currently based on the multilayered elastic method, which is analytical in nature and yields stresses, strains, and deflections in the pavement system for a particular loading condition and pavement geometry, which are compared with established failure criteria to determine the performance of the given pavement. This design approaches is deterministic. In this paper, typical asphalt pavement structure reliability analysis was performed in which factors that affect pavement reliability regarded as input random , pavement surface deflection, layers of bottom stress and limit state function regarded as output variables , by reliability tool infinite element analysis, base on Monte Carlo’s Latin hypercube sampling method.At last the paper pertinently offered decision basis for improve the reliability of pavement structure and important reference values for drafting and selecting of asphalt pavement design parameters through calculating the reliability of pavement structure, sensitivity analysis of the design parameters is made.
Analysis on Three-Direction Strain of Asphalt Pavement Structure Based on Accelerated Pavement Testing
Authors: Wu Jin Ting , Ye Fen , Wu Yin Ting
Published: June 2011

The internal mechanical response of asphalt pavement structure is difficult to be obtained because of the limitations of theoretical calculation and present testing methods. In order to get practical information of instructure layers, this paper analyzed the cumulative and instantaneous strains of layers’ bottom of semi-rigid base asphalt pavement based on Accelerated Pavement Testing and Fiber Bragg Grating sensors, as well as got the spatial distribution and time-variation law of longitudinal, lateral and vertical strain responses under controlled loading condition. The research result shows that under the moving vehicle loads, there is an obvious alternative property of tension-compression as the strain response of the pavement structure, and different variation shapes of instantaneous stain are in different layers from top to down. Also the measured instantaneous three-direction strain of the bottom of each surface are higher than the calculated values with BISAR, while they anatomizes well in base. This paper can be regarded as useful and tentative research and application on future correlative study.
Research on Performance of Emulsion Asphalt Cold Reclaimed Mixture with Various RAP Contents
Authors: Tang Xian Yuan , Xiao Jie
Published: June 2011

This paper systematically elaborates the impact upon performance of emulsion asphalt cold reclaimed asphalt mixture by different RAP contents, through a series of testing on six cold reclaimed asphalt mixtures with various RAP contents, such as single axle compression test, 15°C indirect tensile strength (ITS) test, 40°C rutting test and -10°C low-temperature bending beam test. Testing results indicate that 15°C ITS decreases from around 0.75 MPa to 0.58 MPa with the RAP content of mixture increasing from 0% to 100%. 40°C dynamic stabilities reduce considerably from around 19,000 time/mm of 0% RAP mixture to 3,600 time/mm of 100% RAP mixture. -10°C failure strains only change from 1500με to 2000με.
Fatigue Life Evaluation of Asphalt Rubber Mixtures Using Semi-Circular Bending Test
Authors: Liu Jing Hui
Published: June 2011

The Semi-Circular Bending (SCB) test, which is chosen as the best inspecting method for pavement cores, is of great significance. Based on the SCB test and flexure beam test, this paper presents the findings of a laboratory study that aimed to evaluate the effects of recycled tire rubber on the fatigue properties of asphalt mixtures. Three mix types, a conventional hot-mix asphalt concrete, a dry process rubber modified asphalt concrete, and a wet process asphalt-rubber concrete, were included in the investigation. It is found that the asphalt mixtures produced by the wet and dry process showed better fatigue performance, which is the same conclusion from the SCB test and flexure beam test. The SCB test can be an effective evaluation means for the pavement service performance of asphalt rubber mixtures.
Analysis on Anchorage Length of Compression Anchor
Authors: Tu Bing Xiong , Jia Jin Qing , Yuan Hong Sheng , Wang Hai Tao
Published: June 2011

This paper proposes a new model to calculate anchorage length for the compression anchor. Then the analytic solutions for the effective length and the critical length are derived according to the model. The analysis to the solutions show that the larger the rock mass’s elastic modulus, cohesion and internal friction angle, the smaller the anchorage length. Besides, the larger the load, the greater the anchorage length. However, the poisson’s ratio of rock mass nearly has no influence on the anchorage length. It is most important that the two calculation length show great agreement with present codes or specification.
Develop Probability Distribution Function to Select Pavement Preventive Maintenance Materials and Methods
Authors: Khabiri Mohammad M.
Published: June 2011

Maintenance and protection of road pavements are one of important tasks of highway agencies. Many studies are done about specifying suitable time for pavement preventive maintenance. The probability distribution isn't used in this study, although the significant factor in decision making is relevant to probability function. In present paper, the suitable time between two preventive repairs is determined by Erlangen probability distribution function method. Economical factors are one of important parameters in this method, so, maintenance and repairing process cost, the useful life of maintenance process and the cutting of traffic flow are applied in calculation of suggested method.
Dynamical Simulation of Magnetorheological Fluid Characteristics
Authors: Zhang Jin Qiu , Zhang Jian , Kong Ya Nan , Cuan Hong Liang
Published: June 2011

The aim of this research is to improve characteristic of magnetorheological fluid, and to supply theoretic basis for preparing MRF and applying MRF. By molecular dynamical simulation in MATLAB, microstructure of MRF, mechanism of MRF, and factors of affecting MRF characteristic were investigated. Based on theory of magnetic dipoles and microstructure characteristic of MRF, various factors affecting magnetic chain structure were considered, microcosmic model of MRF was established, factors affecting velocity of MRF forming chains were analyzed.
Study on the Thermal Stress Field of Steel 1045 Quenched by Water
Authors: Xie Jian Bin , He Tian Chun , Cheng He Ming
Published: June 2011

In this paper, based on the experimental measured cooling curves, it was solved that the inverse problem of non-linear heat conduct equation for Steel 1045 quenched by water using finite difference method and nonlinear estimate method. The volume fraction of constituent of austenite, pearlite, bainite, martensite and the non-linear surface heat-transfer coefficients in continuous cooling during quenching were calculated and simulated by mathematical transformation. The volume fraction of phase constituents in the quenched work piece of 1045 steel was tested subsequently. Then the temperature field and thermal stress field of Steel 1045 cylinder during water quenching was simulated by ANSYS. The study results show that the 2D transient temperature field of the cylinder specimen calculated by ANSYS during quenching coincides with the practical quenching process, and the results of thermal stress field simulated by ANSYS can guide quenching process.
Study on System of Gravity Dams Aided Design
Authors: Hou Zhi Yuan , Tian Bin , Xiao Ze Yun
Published: June 2011

Since there are some characteristics such as correlation, repeatability and integrity during the gravity dam design process, an automatic gravity dam assistant design system was established by adopting C sharp programming language, Visual Studio Development Suite as well as material mechanics and Technology of Parametric Drawing. The System includes four modules: 3D geological modeling, gravity dam structure modeling, dam sections analysis and database management. These modules realized different specialty cooperation and offered many-side analysis such as: 3D finite element analysis, stability analysis, stress analysis, section optimization and report export.
Fatigue Behavior of Prestressed Concrete Beams under Corrosion
Authors: Yu Fang , Jia Jin Qing , Yao Da Li , Zhu Wei Qing
Published: June 2011

Fatigue behaviors of prestressed concrete beams with different corrosion level are investigated in a series of bonded post-tensioned T-beams. The beams have the same designs and submitted to the same maximum and minimum load during the test. Accelerated corrosion method is used to make various corrosion rates of prestressed steel strands. With the corrosion level as main parameter, such as failure mode, fatigue life, mid-span deflection development, stiffness loss, stress expansion, are studied. The test results show that failure mode is changed fracture of non-prestressed steel bar into prestressed steel strand breaking with the increase of corrosion level. Corrosion reduces fatigue life and stiffness of beams, increase deflection and stress range of non-prestressed steel bar.
Study on Swelling-Shrinkage Behavior of Vertisols along Fujian Coast
Authors: Chen Ming Xia , Zhu He Jian
Published: June 2011

The climatic zone is characterized by alternate wet and dry seasons along Fujian coast. The vertisols experience periodic swelling-shrinkage during alternate wet and dry seasons. 16 soil samples from different profiles (0~20cm depth, 20~40cm depth)were collected from different regions in the research area. The paper shows the swelling-shrinkage behavior along Fujian coast in terms of morphology, particle content and physical properties of vertisols, The structure of the soil profile varies with depth, while the profile horizonation is weak. Crack network is usually observed on the surface. In addition, this paper investigated the effect of wetting and drying on the expansive chatacteristics of the soil. The test results show that after each cycle, the height of the soil samples increased. This indicates that the swell-shrink behavior of vertisols is not completely reversible. The swelling-shrinkage characteristics of soils become greater with stickier texture. Compared to undisturbed soils, the swelling-shrinkage behavior of disturbed soils are greater.
Exploring of the Plunge Pool Shape Optimization
Authors: Yan Tao , Chen He Chun , Wen Bin , Chen Biao
Published: June 2011

At present the flat plunge pool and inverted-arch plunge pool are usual plunge pool shape styles in high dam construction. we improve the plunge pool shape according to the study of special flow pattern in the plunge pool and the plunge pool scour mechanism, the high-speed submerged jet diffusion rule in plunge pool, impingement pressure variation rules with the jet flow route changment and some other hydraulic factors, combining with a series of scour experimental results. We analyze the specific situations in the transverse profile and longitudinal profile of the plunge pool respectively and then make corresponding changes. The creative longitudinal profile curve of the inverted-arch plunge pool make a double inverted-arch plunge pool, which makes the hydrodynamic elements and the structure of the plunge pool are in a harmonious state ensuring the safe operation of the plunge pool.
Experimental Study of Subgrade Scout Width Along River Bend
Authors: Liu Li , Chen Hong Kai , He Guang Chun
Published: June 2011

In the paper, scour mechanism and factors influencing the scour width of roadbed along river are analyzed. Through the method of theoretical analysis and experiment study, the formula of the maximum width depth of prevention wall in concave bank of G315 is put forward. The formulation of the maximum width depth is theoretics and technic bases of protecting water scour.
Calculation Model for Crack Width of Smart Film Based on Shear-Lag Theory
Authors: Xu Yong , Zhou Zhi Xiang , Zhang Ben Niu
Published: June 2011

Detection of crack width is crucial in structural health monitoring of concrete bridge. In this paper, the smart film has been employed to monitor the crack initiation and development in concrete bridges. Under plane stress and two dimension conditions, through structure mechanics behavior analysis, the calculation model for crack width of smart film was constructed based on the shear-lag theory. Calculation model study demonstrated the relationship between crack width and diameter of the smart film, and the crack width could be calculated.
Calculation and Control of Seepage of Hardfill Dam with Different Foundation
Authors: Peng Yun Feng
Published: June 2011

As a new dam type, Hardfill dam has been arisen recently. The suitable geologic condition of t Hardfill dam construction was analyzed based on considering its characteristics in this paper; it was also studied how to choose the reasonable impervious and drainage system to control the dam body and foundation’s seepage on a given geologic condition to make sure the safety of the project. On the basis of analyzing the foundation geologic conditions of many common dam types, two kinds of typical Hardfill dam foundation were put forward. The seepage field law of dam foundation was analyzed by dam foundation seepage discharge, uplift pressure and seepage gradient of some typical positions after setting reasonable impervious and drainage measures on the two kinds of dam foundations. It is indicated by the calculation results that the adaptability of Hardfill dam foundation is comparatively nice, and the safety of dam foundation can be ensured if appropriate impervious and drainage measures are adopted.
Safety Analysis of the Temporary Dam Body of Concrete Faced Rockfill Dam during Construction Period
Authors: Lu Xiao Chun , Tian Bin , Zhang Suo
Published: June 2011

Concrete faced Rockfill dam (CFRD) is a safe and economical dam type in hydraulic engineering. The temporary dam body for flood control during construction period is usually used for CFRD, so the safety of temporary dam body during construction period is very important. Based on numerical simulation of the seepage field of the temporary dam body of CFRD using nonlinear FEM (Finite Element Method) under the action of flood of the river during construction period, the stability of the dam slope is studied. The effectiveness and applicability of the method introduced is certified through computation in the study on the practical project. The paper provides an effective analysis method for the study on the stability of dam slope of the temporary dam body of CFRD for flood control during construction period.
Study on the Buckling of Steel Columns with one Special-Shaped Section
Authors: Chen Jun Ling , Huang Xin , Ma Ren Le
Published: June 2011

One large-diameter and non-circular steel tube was adopted in Henan TV tower (China). This special cross-section consists of three flat plates welded to three arc plates one by one. This paper studies the critical local buckling behavior of steel plates by using the finite element analysis method. Initial geometric imperfections and residual stresses presented in steel plates, material yielding and strain hardening were taken into account in the nonlinear analysis. An experimental study was performed to verify the capacity ability of this special steel tube. Based on the results obtained from the nonlinear finite element analyses and experiments, a set of design recommendations are provided for ensuring the safety of this special tube in Henan TV tower.
The Research of Coat Materials Performance Based on Multi-Scale Method
Authors: Ren Ke Liang , Dong Yan , Wang Yan Chang
Published: June 2011

As for the multi-scale coupling phenomenon among substrate, bonding coat and coating in thermal barrier coating materials, the method of wavelet-based homogenization are used to convert the thermal equilibrium equation into a group of algebraic equations. Using this method, an operational matrix of integration based on the wavelet is established and the procedure for applying the matrix to solve the temperature and displacement are formulated. The results provide a theoretical basic for selecting coating thickness of thermal barrier coating materials in optimization design.
Study on the Deep Rock Parameters of Fushun Mining Area
Authors: Zhou Jian Jun , Fu Zhan Ling , Zhao Guo Bin , Han Geng You
Published: June 2011

In order to get the mechanical parameters of deep rock for the Fushun mining area, some mechanical properties tests of rock prepared from the drill core and trial adit were carried out. The complex mechanical parameters of rock mass were proposed by inversion of B-P neural network method with intruding the uniformity design theory. The deep rock parameters were amended and correction factor was proposed by according to geostress test and high confining pressure triaxial compression test.
Instability Identification of Goaf Risky in Mines Based on Distance Discriminant Analysis Method
Authors: Yan Xiao Ming , Chen Xiang Yun , Gong Feng Qiang
Published: June 2011

The instability identification of goaf risky is an important work in the mine engineering. Based on distance discriminant analysis, a method to identify the instability of goaf risky in mines was presented in this paper. Nine factors influencing the stability of goaf risky, including uniaxial compressive strength of rock, elastic modulus of rock, rock quality designation (RQD), area ration of pillar, ratio of width to height of pillar, depth of ore body, volume of goaf, dip of ore body and area of goaf, were selected as discriminant indexes in the stability analysis of goaf. The actual data of 40 goafs were used as training samples to establish a discriminant analysis model to identify the stability of goaf. The results show that this discriminant analysis model has high precision and misdiscriminant ratio is 0.025 in re-substitution process. The instability identification of a metal mine was discriminanted by using this model and the identification result is identical with that of practical situation.
Numerical Analysis on Tunnel Support Nearly Mined Area and Stability Evaluation
Authors: Yu Wei Jian
Published: June 2011

Since deformations of tunnel nearly mined area are larger, the reasonable support is very important. According to a side working face tunnel nearly mined area in one Mine, FLAC 2D was applied to numerical analyze on two type bolt net supported tunnel of “short bolt and long anchor cable” and “full anchor cable”. The results showed as follows: (1) plastic region of surrounding rock relatively large, which supported by short bolt and long anchor cable. Displacement reaches 27cm, the effect of this type supporting not significant; (2) The supporting of full anchor cable can effectively control deformation of tunnel, displacement less than 5cm, plastic region of surrounding rock also less than 2.3m. So, the supporting of full anchor cable can meet operating requirements.
Thick Board Theory on the Bolting Support of the Ribs in Coal Mine Roadway
Authors: Yang Shuang Suo , Niu Shao Qing
Published: June 2011

According to the character that broken rock mass still has higher compressive strength with appropriate support action though it can not bear tensile stress and deformation character of board with different width-thickness ratios, an idea of keeping the stability of both sides of roadway with anchorage body was put forward, namely, the width(height)-thickness ratio of the anchorage body should be higher than that of the sheet. Thus the higher compression and shear strength can play the main role in keeping the roadway stable. A clear and definite theory for bolting support has been put forward, and the determination methods of geometrical and mechanical parameters of bolting support such as bolting strength, bolt length, spacing, interval of row and bolted length etc. have been deduced.
Study on the Structure Characteristics and Ground Pressure Behavior of Overlying Strata with Shallow Buried Coal Seam
Authors: Yu Lei , Fan Zhi Zhong , Xu Gang
Published: June 2011

The mine pressure behavior characters of shallow buried coal seam differed from both shallow seam mining and general depth seam. Mine pressure observation and numerical analysis were applied to research mine pressure behavior laws in fully mechanized face of shallow buried coal seam with thick bedrock and thin alluvium. It showed that the ground subsidence level phenomenon did not appear obviously although with obvious dynamic loading of fully mechanized face during the pressure period. The appearance was due to non-synchronized fracture from two key layers in the overlying rock layers and their interaction, which leaded to roof breaking initially and caving rocks with the form of an arch. Due to the periodic breaking and caving characteristics appearing as fully cut-down and arch alternately, the periodic pressure of shallow buried coal seam face showed as different size. The conclusion could be a reference for similar working face control.
Development of Scientific Mining: a Case Study of Gob-Side Entry Retaining Technology in China
Authors: Xu Ying , Bai Jian Biao , Chen Yong , Yue Jun
Published: June 2011

The gob-side entry retaining technology, one of the scientific mining technical system, can enhance coal recovery rate and reduce entry excavation quantity. However, only the effective entry-side support and the proper entry-in support could guarantee stability of the retaining entry undergoing mining influences of two working faces. In order to recover the section coal pillar between two working faces, the technology is applied in Qinxin coal mine. By using the high-water rapid hardening material as backfill material, the backfill pumps as transportation equipments of the material, the steel formwork and backfill bag as forming molds of the material, the entry-side support is of high support resistance, certain shrinkage, convenient construction. As for the entry-in support, the bolt support is designed to improve the bearing capacity and anti-deformation capacity of the surrounding rock, and the single hydraulic prop is adopted to reinforce roof support. The observation results show that the retaining entry keeps good performance. The case not only brings better economical benefit for Qinxin coal mine but also has referential significance for other coal mines.
Mechanical Behavior Study on Headed Studs for Composite Truss Joint
Authors: Xue Dong Yan , Liu Yu Qing , Huang Sheng Fu , Ma Biao
Published: June 2011

Finite element analysis (FEA) method is used to study the mechanical properties of headed studs for composite truss joint. The results show that the shear forces in the first few rows of headed studs are much greater than others. The shear forces in the rear headed studs decrease gradually. This study shows that the stiffness of headed studs, the layout of headed studs, and the steel backing plate are the main influencing factors on shear forces of headed studs. It is also expected that the results presented in this paper would be useful as references for the further research and the design of composite truss bridge and composite joint.
The Inverse Modeling Method of Rock Rheological Model
Authors: Zhang Xiang Dong , Ruan Jian Jian , Lan Chang Yu
Published: June 2011

Along with the economical and the industrialization development, The development domain of rheology will be expanded. At present There are many researches about rock rheological, but the existing model Cannot completely, indication properties of rock, Especially the nonlinear rheological model and rock creep constitutive model of accelerating rheological phase of the study is scarce. After viewing a large number of the composition of rheological models and their laws in current papers, we find out what they are common and give the simplified method of creep equation and relaxation equation .Then we propose the inverse method to establish the new nonlinear rheological element model and the constitutive equation method. This paper focuses on establishing a new method of rheological model which provide technical support.
Numerical Simulation of Structure Dynamic Response for Civil Architecture under Mining Blasting Vibration
Authors: Zhang Zhi Yu , Luan Long Fa , Xie Jian Bin
Published: June 2011

According to the geological conditions of mine and mine’s surrounding construction, the geological mechanical model of explosion area and the structure model of surrounding civil architecture were established. Based on the monitoring blasting vibration result of mining explosion process, the dynamic response character and structural stress of surrounding civil architecture which have been caused by blasting vibration of mining were studied by means of the Finite Element Method (FEM) and the method of fast Lagrangian analysis of continua three dimensions (FLAC 3D). The results show that calculated results coincide with the monitor results collectively, and the influence caused by blasting vibration on the stress and strains of civil architecture is smaller. But at the civil architecture roof, the transient amplification acceleration caused by blasting is 25%.
Study on the Influence of Stability for Higher Precipitous Open Pit Slope under Mining Blasting
Authors: Zhang Zhi Yu , Luan Long Fa , Yao Ji , Xie Jian Bin , Li Xiang Long
Published: June 2011

Based on the hydrological, geologies and slope features of Jianshan phosphate mine in Yunnan province, the geomechanics model of slope was established. Then the static stability of different elevations in mining section was studied by using methods such as the rigid body limit equilibrium method, finite element method, continuum large deformation Lagrange element method. According to the supervise data of the mining blasting, the dynamic response of the slope in blasting was studied by continuum large deformation Lagrange element method, and some suggestions were proposed for following mining blasting. The research results show that the slope was in the stable status before blasting vibration. Current mining blasting vibration has little effect on the stability of slope, but would reduce the safety factor of the top of the slope. Single blasting would enlarge the instantaneous acceleration of the top of the slope in a ratio of 8.8% and 10.8%.
Physical Model Test on Thick Gravel Layer Inclined Shaft Deformation and Failure in Yili No.1 Coal Mine
Authors: Guo Dong Ming , Zhang Yi , Han Peng Fei , Zhuang Jing Zhao
Published: June 2011

There exists a thick layer of gravel in Quaternary alluvium surface soil layer in most areas of Xinjiang, China. When passing through the gravel layer during mine construction, mine workings collapse and rib spalling often happen, which influences the mine working’s construction and bring hidden danger to safe construction. This article took the engineering geological characteristics of thick gravel layer in Ili mining area in Xinjiang as background, carried out the gravel layer roadway’s deformation and failure tests based on the principle of similar model test, and analyzed and summarized the law of the surrounding rock deformation and failure. The results indicates that: Seepage is the decisive factor in the destruction of gravel layer surrounding rock; roof displacement increased from 1.8mm up to 3.4mm when the gravel layer roadway surrounding rock’s water content grows from 7% to 12.67%, which shows that displacement of surrounding rock increased with the increase of water content; coupling support has the best effect in gravel layer roadway. The research results play a guidance role and have a reference value for the engineering with the same type of roadway design and construction.
Research on the Stress-Strain Curve and Damage of Steel Fiber Reinforced Concrete under Uniaxial Loading
Authors: Yang Run Nian , Wei De Min
Published: June 2011

The static failure can be seen as a special fatigue failure, which means the static failure is the fatigue failure only bearing one cycle under the ultimate-strength loading. By learning from the analysis of fatigue damage, the stress- strain curve and damage of steel fiber reinforced concrete under uniaxial loading have been studied in this paper. The damage evolution equation can be derived from the damage theory, and it can be used to describe the relationship between the damage variable and strain. According to the strain equivalence principle, the corresponding constitutive equation considering damage can be obtained. Finally, comparisons among test results, the model and ansys simulation results show that the model is suitable to describe the uniaxial stress-strain curves of steel fiber reinforced concrete.
Research of the Best Combination of Cooling Parameters in High Temperature Work Deep Stope
Authors: Zhang Yi , Guo Dong Ming , Han Qiao Yun
Published: June 2011

When designing cooling engineering in deep stope, the three parameters, air temperature, air velocity and distance between cooling air and work place, are three key factors to determine cooling effect. Lowering air temperature, increasing air velocity and shortening the distance between cooling air and work place can all achieve the purpose of cooling work place. Not only to achieve the purpose of cooling, but also to reduce operating costs, save energy and extend the service life of cooling equipments, these three parameters should be chosen and combinated rationally, to gain the fine operation conditions. Taking 7446 work face in Jiahe coal mine as an example, on the base of analysis of multiple sets of cooling parameters in a variety of conditions, it proposes the range of parameters which can gain better cooling effect, more economical run and longer cooling equipments service life. It provides a wider choice of reasonable parameters for 7446 work face cooling engineering.
A Study on Designing No-Penalty Reporting System about Enterprise Staff’s near Miss
Authors: Zong Ling , Fu Gui
Published: June 2011

In order to prevent work safety accidents from occurring and gather some information valuable for enterprises’ safety in production, enterprises should build a reporting system with no-penalty. Establishing the system should be followed by the principle of voluntariness, confidentiality and no-penalty. Under the situation where the enterprise staff’s near miss is caused by negligence, hasn’t led to dangerous consequences and he/she makes self-report without delay, staffs shall be exempted from punishment. With the purpose of guaranteeing the operation of the system, a perfect reporting procedure should be set up. Meanwhile, the article also researches into some other problems such as the countermeasures of the enterprise staff’s not making self-report in the process of implementing the system, defining the scope of self-report clearly, carrying out error correction measures and so on.
Stability of Automobility across Lifecycle Stages over Time
Authors: Sun Yi Lin , Huang Zhi Yi , Kitamura Ryuichi
Published: June 2011

This paper describes how automobility characteristics changed across lifecycle stages within different residential areas over time using statistical analyses. The results confirm that lifecycle is a useful classificatory variable in explaining automobility characteristics. Through analysis of four variances (including lifecycle stage, residential area, time, and age effects), the result suggests that residence area mainly determines the automobile ownership, but household members’ age is one of the main explainers for the fraction of auto trips and total auto travel time.
Analysis of Contract Dispute Settlement Mode for International Project Based on DAB
Authors: Tan Wei , Zhou Yi Hong , Huang Jian Wen , Zhang Shuo
Published: June 2011

Contract dispute is often arisen during the implement of international projects for its high amount and long duration; therefore, the contract dispute settlement is one of the most important content of contract management. The reasons of arising contract dispute in the international engineering were analyzed in this paper first; on the basis of that, several common dispute settlement modes were presented, a new method named DAB (Dispute Adjudication Board) was preliminarily introduced; in addition, an engineering case were analyzed to illustrate the feasibility of DAB; finally, some suggestions of how to reduce contract dispute were put forward from both enterprises themselves and contract management.
Risk Assessment and Transaction Cost Incorporated Budgeting for Construction Joint Ventures
Authors: Yan Min Ren
Published: June 2011

Proper budgeting and cost control are essential efforts for a successful project. The task has been conventionally supported by sophisticated project cost estimation from a production perspective. However, from a transaction cost perspective, the alliance risks with inter-organizational partners in joint venture (JV) projects should always be considered for budgeting. Aiming to assess the risks of a JV project, this paper proposes a transaction cost incorporated budgeting model with multi-criteria utility analysis. A case study is presented to demonstrate the applications of the proposed model which would help project managers to identify a proper risk contingency for practical project budgeting in construction JVs. The rationale of estimating the alliance risks with different partners is also enhanced by the proposed model.
The Application of Construction Company Selection with Multi-Attribute Decision Making Model under the Uncertain Condition
Authors: Yuan Chun Yan , Li Hui Min
Published: June 2011

With the development of the industry of building safety on the strength and rehabilitation, the safety management institution is dissymmetry with the construction company in message. Under this condition, multi-attribute decision making model can solve the problem of selection.
Design and Application Research on Division System of Steel Enterprise Group
Authors: Li Feng Xia
Published: June 2011

This paper presents the setting of Henan Hangxiao division, elaborates the organizational structure of the adjusted Henan Hangxiao business processes in detail, analysis the problems and countermeasures caused by for the operation of Henan Hangxiao Division, and makes the application analysis the performance management and operation from the target application effect of two aspects of management in Henan Province Hangxiao operational management research division. Application shows that: the division management system increased operating flexibility in Henan Hangxiao ability to form a cluster effect of enterprise groups, and strengthen the crisis management capacity, increasing the number of reserve talent.
Research on Construction of Risk Information Mining System in Programme
Authors: Zhang Zhi Guo
Published: June 2011

Programme management is integrated and coordinated management for multitudinous interactive Projects, It is a very important part of multi-Project management and trend for Project management development. Compared with single project management, It may face more kind and more complicated risks in the process of programme management. on the base of programme risk management, the paper analyze concept, characters, classification of risk information ,and designed system of programme risk information mining, then analyze the factors. It can provide a basis for the risk management.
Study on in-Service Bridge LCC Decision Model Based on Maintenance Management System
Authors: Wu Yu Meng , Chang Jun
Published: June 2011

In this paper, decision-making tree and Markov process are used to select maintenance strategies of in-service bridges with the minimum LCC (life-cycle cost). Other costs in life cycle are considered comprehensively when establish the model to find the optimal maintenance strategy. Finally, an example is given to verify the efficiency of the model. The research methodology can provide effective support to bridge maintenance management decision-maker for making management strategies.
The Impact of Chinese New Housing Policies on the Changsha Real Estate Market
Authors: Luo Jia , Tan Lei , Li Yun Fei , Huang Wei
Published: June 2011

It is difficult to assess only by qualitative approaches the impact of Chinese new housing policies on the Changsha real estate market, due to its complexity. In this paper, hence, a model was proposed to evaluate the influence of the new policies quantitatively, by introducing variables which indicate the policies. Based on the analyses, reasonable solutions and suggestions have been put forward, which could provide theoretic supports for the sustainable development of Changsha real estate.