bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Stress Characteristics of the Anchor Bolts in Special-Shaped Roadway
Authors: Peng Fei , Ji Hong Guang , Yan Xue Zhong
Published: June 2012

Rock bolting is one of the most common methods of rock reinforcement. To optimize bolt parameters for reasonably playing its properties under safe support condition, it’s a must to study the mechanical characteristics of roadway and bolt. This paper shows that anchor bolts at the top of the rise side has the maximum force, middle of the two sides minimal. Middle of two sides has the largest displacement, top and bottom smallest by using flac3d to simulate the force of special-shaped roadway under the support of anchor bolts, combined with field observance of anchor bolts force. Therefore, by optimizing anchor bolts supporting parameters, we can effectively control the deformation of surrounding rocks and improve the whole stability through strengthening support and changing partial anchor bolts supporting parameters.
The Development and Application of 3D Visualization and Monitoring Prewarning System for the Highway Road Slope in Mountain Area Based on GIS
Authors: Chen Guo Liang , Zhang Yong Hui , Liu Xiu Guo
Published: June 2012

Based on MapGIS platform, using vc++ development tools and SQLServer database management system,a 3D visualization and monitoring and warning system for mountain area highway slope was developed in this paper.The system realized the remote real-time monitoring, inquiry, statistics analysis and forecast for displacement and rainfall data.the management and data analysis of drilling and cross-section data were also implemented using 2D GIS.A special 3D modeling module was developed to construct the 3D space model of surface,ground and underground,and in the same time, the function of 3D visualization analysis and inquire based on the the models was presented in this system.The system was used in a highway slop of west hunan and a good effect was obtained
Research on Grading Features of Bituminous Steel-Slag Mixture
Authors: Lu Fa Liang , Li Jin
Published: June 2012

To detect and analyze the chemical composition and physic-mechanical properties of converter steel slag of Jigang Group Co., Ltd and evaluate its feasibility as aggregate of the bituminous mixture. Use the steel slag as aggregate, mix the bituminous steel-slag mixture in three different grading structures, compare its physical and mechanical properties and analyze the influence of grading on the technical properties of bituminous steel-slag mixture. According to the test analysis results, determine the optimum grading structure suitable for bituminous steel-slag mixture, re-mix the mixture according to the optimum grading structure and verify its physical and mechanical properties, then based on this, propose reasonable grading range of AC20 bituminous steel-slag mixture.
The Impact of Road Construction Materials Dynamic Modulus Parameters on Road Surface Shearing Stress
Authors: Chuo Er Yong , Wang De Qun , Deng Guo Rui
Published: June 2012

At the beginning,we used the ABAQUS to establish a two-dimensional finite element model of typical asphalt pavement, and analysised the changing axiom of road surface shearing stress under the half sine wave load. Also, we studied on the impact of damping ratio and the driving speed on shearing stress. Finally, by using SPSS13.0 software to compare the impact of speed, the surface layer material damping ratio, lower modulus ratio, the thickness of the surface layer and the thickness of the subbase. The results show that, to reduce the cracking damage caused by oversized shearing stress in asphalt pavement, we should first consider the damping ratio of surface layer material, and the most effective method is to use the road-building material of high damping ratio to prevent cracks, at the same time we should raise the driving speed.
Evaluation Method of Segregation of Road Concrete
Authors: Zhang Yan Cong , Gao Ling Ling , Wang Da Peng
Published: June 2012

To deal with the problem there was no strict evaluation method and standard, an experiment was designed to evaluate the segregation degree of road concrete. Furthermore, the status and index of segregation was determined too. The testing analyzed the distribute character of coarse aggregate in road concrete. Based on the method of digital image processing and the assumption that particles in fresh concrete conform to uniform distribution, a model that size of coarse aggregate against vertical section (the direction against vertical section of specimen) in concrete conforms to continuous distribution was established. Segregation degree—a parameter to characterize the degree of segregation of particles in concrete was proposed. Meanwhile，a reference standard to evaluation segregation degree was given.
Research on Highway Pre-Compression Term on Alluvial Flat Soft Clay Treated with Packed Drain Well
Authors: Yuan Huai Yu , Wang Xiao Mou , Li Guo Qi
Published: June 2012

The joint road of Jiaozuo-Gongyi Yellow River bridge in Henan province is built on the Yiluo River alluvial flat soft ground. The total length treated with packed drain well is 1384 meters. To guarantee project quality and summarize the deformation rules of the alluvial flat soft clay, 15 representative sections are selected and 38 settlement plats are set. The observation has been lasting more than two years from construction to precompression term. By analyzing the characteristic of the soft clay, the settlement type of precompression, the settlement standard of post-construction and the settlement rate of precompression, that the precompression term is not needed is put forward on the alluvial flat soft ground treated with packed drain well.
A New Method for Aggregate Proportion Design of Mixture
Authors: Li Yu Hua , Huang Kai , Gao Ying Zhen
Published: June 2012

When we make design of mixture ratio, we always use normal equation method (NEM), but the solution value of that method may doesn’t meet our demand. When we use the new method that proposed in this paper, we can solve the problem. The new method makes an improvement for NEM. By iterative algorithm, the new method uses the gradation data calculated by NEM as initial target value, canceling the relevant aggregate if the result of proportion is negative, and setting the gradation to the boundary value if the target value goes beyond limits. According to the adjusted object value, using NEM again, the new aggregate proportion can be solved. Then the new gradation of mixture will come into being the next target value. Finally, the accurate result will meet our need. The new improved method has good engineering applicability and high accuracy
Measures Analysis of Energy Saving Reconstruction for Existing Building Windows
Authors: Liu Jian Ping , Zhao Xue Fang
Published: June 2012

The paper describes the status of the energy saving reconstruction of existing buildings external window at home and abroad. on the base of analyzing the heat transfer characteristics and the factors influencing on energy saving of building windows. Effective measures of energy saving reconstruction for existing building windows were established, and these measures include improvement of seal of window, change window sash, increase the window sash, posted on energy-saving membrane in the window, replaced by energy saving window. Energy saving effect of these measures were analyzed. It could be considered as the useful reference for renovation design of similar projects.
Evaluation Analysis on the Traffic Safety Related to the Road Alignment Based on the Operation Speed
Authors: Gao He , Yuan Shao Wei
Published: June 2012

The road safety has close relation to road alignment, and operation speed is the key factor of the road traffic safety. We should make an evaluation on the safety of the road alignment indexes after finishing the design of the road alignment to judge the reasonability of the road alignment indexes. This paper studies the traffic safety of the road alignment based on the idea of operation speed, evaluates the quality of the road alignment by the operation speed, make further improvement for the road alignment indexes, and test the rationality of this idea through engineering examples.
Urban Road Roundabout Method of Contrast Optimization and Research
Authors: Chen Jiong Di , Yang Qing , Qiu Xin , Sun Sheng Nan , He Feng
Published: June 2012

Taking the unconventional roundabout of Huancheng West Road and Huancheng North Road in Jinhua City an example, a research about the existing roundabout is carried on. Through the project’s development, some problems have been discovered, and we put forward some optimized measures for the unconventional roundabout by way of keeping headway exactly. In addition, we optimize the object of study by utilizing the VISSIM software, with which the traffic capacity of roundabout is to develop. Afterwards, a conclusion is drawn that if the vehicles keep the time headway of 0.6S, the traffic capacity of roundabout will be four times as large as it was, with which a new way of thinking about optimizing the roundabout will be provided.
The Application of Streetlight Wireless Monitoring System in Tianjin Bonded Area
Authors: Lin Zhi Ling , Zhang Da Peng
Published: June 2012

A wireless monitoring system was carried out to manage the streetlight in Tianjin bonded area. The system adapted a concentric dropping voltage energy-saving mode and the single lamp was monitored without control. The single lamp’s electrical information was trapped by a detecting module and sent to the communication terminal by power carrier technology. Then the collected information of termination was transferred to a remote monitoring center by GPRS communication module. The streetlights in the subsection were on-off by combining timing with illuminance. The practice shows this system is reliable and effective.
Old Asphalt Road Surface Mixture of Cold Regeneration Research Laboratory Test
Authors: Wei Lian Yu , Yang Zheng Long , Qian Hao , Wang Qing Zhou
Published: June 2012

The use of the old asphalt road surface milling planer old material expansion project for raw materials, the WLB 10 foam asphalt generator, the bubble cold regeneration of asphalt mixture of mechanical properties, put forward the best content foam asphalt, asphalt mixture of foam regeneration and emulsifying asphalt mixture properties of contrast test that bubble scope of application of asphalt reclamation.
Laboratory Study on Cold-Mixtures for Asphalt Pavement
Authors: Ma Shi Bin , Wang Li Jie , Zhang Guo Qiang
Published: June 2012

The main purpose of recycling is to reuse existing pavement material. First this paper reviews the necessary, feasibility and mechanistic analysis of recycled asphalt mixture, then summarizes the findings of a laboratory study to characterize and design recycled asphalt concrete mixtures using different tests. The laboratory tests carried out on the material were conventional test methods including unconfined compressive strength, cleavage strength, resilient modulus and shrinkage properties tests. The results of the laboratory can be taken as reference in design, engineering and further research．
The Effect of Different Warm Additives on Performance Properties of HMA
Authors: Du Shao Wen , Li Shan Shan
Published: June 2012

The effect of three types of warm additives, including Sasobit, Aspha-min and Evotherm DAT, on the compaction temperature, rutting resistance, low temperature resistance and moisture resistance of hot asphalt mixture (HMA) were evaluated by laboratory test. The test results show that Sasobit, Aspha-min and Evotherm DAT can reduce the compaction temperature of HMA by 27°C, 20°C and 30°C respectively. These warm additives all can improve obviously the rutting resistance of HMA. However, Evotherm DAT can increase low temperature cracking resistance ability of HMA. Aspha-min has obviously negative effect on the low temperature cracking resistance and moisture resistance of HMA. Therefore, it is necessary to investigate performance properties of HMA when selecting warm additives.
Numerical Simulation of Railway Track Irregularities Based on Stochastic Expansion Method of Standard Orthogonal Bases
Authors: Zheng Heng Bin , Yan Quan Sheng , Hu Jun Liang , Chen Zhou
Published: June 2012

A new simulation method of stochastic process was accepted in the field of simulation for the track irregularities. This method adopted the Hartley orthogonal bases as the standard orthogonal bases. On the basis of the expansion method of stochastic process, and under the condition of ensuring accuracy, it could capture main probabilistic characters of a stochastic process with only a few independent random variables. Through the numerical simulation of the example, it testified the validity and effectiveness of the new method.
Experimental Study of the Accumulation Dynamic Residual Strain of Ice under Rail Traffic Loading
Authors: Zhu Zhan Yuan , Chen Shi Jun , Li Qiong Lin , Wang Li Na , Zhang Feng
Published: June 2012

Based on dynamic tri-axial test at low temperature, deformation behavior of ice is studied under stepped axial cyclic loading. Time history curves of residual strain of ice are investigated under different negative temperatures and frequencies. Conclusions can be drawn as follows: dynamic residual strain rate increases with the increasing of stress ratio and frequency, while decreases with the decreasing of temperature. According to test data, power function is brought forward to fit the relation between stress ratio, negative temperature, frequency and dynamic residual strain rate. Then, the effect of fitting parameters by temperature and frequency was investigated.
Dynamic Analysis of the Piled Embankment under Seismic Excitations
Authors: Zhang Shi Ping , Cui Chun Yi , Wang Zhong Tao
Published: June 2012

Aiming at discussing the behavior of piled embankment under seismic excitations, the numerical analysis model is built by employing ADINA. The interaction of embankment backfill with piles and subsoil is considered. And Coulomb contact pairs based on penalty algorithm is adopted to simulate the contact behavior between pile and soil. Through the varieties of relative displacement and acceleration of embankment structure acted by earthquake loads are analyzed, the weakness of structure is marked and corresponding design suggestion is proposed. It reveals that the displacement and acceleration response of embankment vary non-monotonically, and the peak value of acceleration response of pile firstly increases and then decreases with height of pile, and one of displacement response relative to pile bottom firstly increases and then decreases as well.
Study on Semi-Rigid Road Base Asphalt Pavement Typical Structure of Town Roads
Authors: Wei Lian Yu , Li Hao , Zhang Jin Liang , Ma Shi Bin
Published: June 2012

In this paper, authors analyzed the semi-rigid road base asphalt pavement of towns and studied the optimum design methods of it, combining characteristics of town roads, considering natural conditions, vehicle axle,materialsupply,construction techniques, maintenance, transportation and so on, referring to design experiences of asphalt pavement in Tian Jin area, through indoor and outdoor experiments, applying math methods. In addition,optimum pavement structure function and calculating methods is given out, asphalt pavement structure adapt to Tian Jin area is recommended and CAD program is developed.
The Rational Construction Length Alternately by Subsections of the Reconstruction Project of Freeway
Authors: Cheng Shuang , Zhu Shun Ying , Wang Hong , Liu Bing
Published: June 2012

In order to ensure the quality of the reconstruction project of freeway as well as the traffic efficiency without breaking down the traffic, it is crucially important to arrange the work zone length alternately by sub-ways and subsections. The simulation method of transportation is adopted for Microscopic of the transportation situation under various length of work zone. Based on the results of the simulation, the stability, efficiency and safety of traffic flow are evaluated and analyzed comprehensively. The balance point among these three factors is determinated by the method of fuzzy comprehensive evaluation. Combined with the project cost, construction cost saving and other factors. to get the reasonable construction segment length reference value. Finally, G4 freeway (Beijing to Hong Kong and Macao) is selected as a case study.
Large-Scale Intelligent Building Energy-Saving Measures Based on BA System
Authors: Chen Xiao Rong , Yang Wen
Published: June 2012

With the rapid development of the intelligent building in China, Intelligent building energy consumption has become a social and economic development in a strategic issue that can not be ignored in our society. In this paper, we proposed the energy saving measures in central air conditioning and ventilation system and lighting system of large-scale intelligent building building automation (BA) system from four aspects.
Research on Ground Subsidence Law Using FEM for Comprehensive Mechanized Caving Coal Mining under Railway
Authors: Wang Yang , Li Qing Yuan
Published: June 2012

With the project of mining 701 Working Face of Baojianshan Coalmine of Jingyuan Coal Industry Group undermine special railway as a background, the authors predict ground subsidence law caused by routine comprehensive mechanized caving coal mining method and back filling method with elastic-plastic nonlinear FEM method. By different exploitation methods, development law of horizontal displacement, vertical displacement, shift angle of strata during mining is given. According to predication by FEM method, the maximum vertical settlement of subsidence area near railway subgrade is 7cm, which is caused by mining 701 Working Face. The in-situ monitoring results were essentially identical with the FEM predication value, this indicates that FEM predication is reliable. The rehabilitation technical measure of railway bed and deformation monitoring scheme of railway during long-term operation are advised.
Discussion on Rock-Fill Embankment and Manufactured Sand Using Tunnel Abandoned Dreg in Hu-Yang Expressway
Authors: Yuan Huai Yu , Wang Xiao Mou , Song Wen Jia
Published: June 2012

The Hu-Yang expressway, the first one in mountainous area in Shannxi province, has two conflicts in construction. One is the tunnel abandoned dreg is difficult to place, and cause ecological environment damage; the other is the project needs so much filler and sand which is scarce along the line. The tunnel abandoned dreg for rock-fill embankment and manufactured sand is designed to solve the problems. Slope greening, crushed run rock in certain range of roadbed and back of the retain wall and compaction control method of rock-fill embankment are discussed. And in view of technical and economic aspects, the application of manufactured sand is also studied. It decided to adopt manufactured sand in the Hu-Yang expressway for the first time in highway construction in Shaanxi province.
Dynamic Calculation of the Port Highway of Riprap Quantities
Authors: Pan Min Hao , Peng Wei Bing , Wang Yong
Published: June 2012

In the construction process of the port highway, riprap quantities are difficult to accurately predict which has bought great difficulties to the riprap vessel to organize construction. Besides, it results in a huge waste of riprap in the construction of the port highway, even leads to the riprap vessel aground during construction process. After predicting the undersea terrain model, we can propose plane model and the basic algorithm .By using the algorithm, it is easy to calculate the amount of engineering in the riprap and the undersea terrain changes after the riprap. So we can get a reasonable dumping location. Finally, compared the predicted results with measured results of the seabed elevation after the riprap, the outcome is basically the same. It provides an effective tool for the construction process of the port highway.
Thermal Effect Mechanism on Composite Pavement Consisted of Asphalt Surface Overlay and Concrete Layer
Authors: Dong Ying Na , Huang Qiang , Wang Hua Ping
Published: June 2012

Composite pavement consisted of flexible asphalt surface overlay and rigid concrete base layer has come up. Though it occupies advantages of asphalt and concrete pavements, still there are problems containing thermal cracking, rutting deformation and pothole which result from the out-sync shrinkage of temperature. Therefore, influence of temperature on the composite pavement structure has been analyzed with methods of theoretical analysis and numerical simulation. And results indicate that the thickness of asphalt layer in some sense determines the influence extent of temperature and worst case happens at the concrete joints, which means that the optimal asphalt (Here, the best choice of asphalt thickness equals 16cm) and suitable joints should be designed.
Research Progress on Ultraviolet Aging of Asphalt and Asphalt Mixtures
Authors: Li Hui Xia , Wang Jian , Li Feng Xia
Published: June 2012

The ultraviolet aging of asphalt and asphalt mixture has attracted attention worldwide from research progress and testing methods. The research progress and testing methods of ultraviolet aging of asphalt are described in this paper. Author also briefly discussed the methods for improving anti-aging properties of asphalt and asphalt mixture.
Analysis and Application of Ecological Protection Technique for Slope Protection in Mountainous Area Expressway
Authors: Qin Feng Yan , Ge Hai Yu , Yan Fu Lian , Chang Guang Ming
Published: June 2012

Through the analysis of ecological protection for slope protection in mountainous area expressway,it illustrated the ecological protection technique advantage and mechanism.A new ecological protection technique is put forward,which is vegetation blanket protection technique.This ecology protection method was applied in the Lu'an-Qianshan Expressway and proved effective. The feasibility of protective measures was analyzed. Which provide a new ecology protection way to the expressway slope, which is in inferior land and rock area.Its protection mechanism and design principle is discussed in this paper.
Research on Road-Side Safety Evaluation and Disposal Technologies of Mountainous Rural Highway
Authors: Wang Qing Zhou , Zhang Yang , Ma Shi Bin , Jiang Kai Zhen
Published: June 2012

To reflect the real risk situation of mountainous rural highway and find out security risks, it is essential to ensure road safety with setting reasonable and effective security facilities in road-side dangerous sections. Based on SPA theory, establish the risk rating as the target layer and traffic characteristics, cross-section of the road, horizontal and vertical alignment as the criterion level, the Set Pair Analysis Model (SPAM) of mountainous rural highway road-side risk rating evaluation which contains ten key indicators realizes quantitative evaluation of risk rating on road-side risk. The model which is applied to practical engineering considers local materials as principle, proposes road-side protection facilities type and design parameters for different risk levels which is suitable for mountainous rural highway. Applications in Chengde mountainous rural highway show that evaluation results of SPAM model are objective and reasonable, it is a new method of comprehensive evaluation of the complex system for mountainous rural highway.
Studying Viscoelastic Properties of Asphalt Mixture Basing on CAM Model in the Full-Temperature-Full-Frequency Range
Authors: Chi Feng Xia , Wang Li Jian , Zhang Xiao Ning , Shi Jun
Published: June 2012

In order to study viscoelastic properties of asphalt mixture, an advanced Shear Rheometer is used. The continuous dynamic frequency scanning test is carried out, which can get full-temperature-full-frequency master curve of asphalt mixture by the time-temperature equivalence principle. The CAM model acts as the rheological model for studying viscoelastic properties of asphalt mixture, because CAM model’s parameters have clear physical meaning. Then viscoelastic properties of asphalt mixture are studied basing on the four equations of CAM model in the full-temperature-full-frequency range.
Research on Anti-Rutting Performance of Reconstruct Pavement
Authors: Wei Lian Yu , Gao Fei , Ma Shi Bin , Wang Qing Zhou
Published: June 2012

Based on the overhaul structure of actual asphalt pavement, establishes the finite element model and analyses the shear stress in the state of overload, longitudinal slope and contact coefficient. The result is that the load and the gradient of longitudinal slope larger, the influence of rutting more seriously. The growth of shear stress is larger which brought by adding load on steep longitudinal slope than that of adding on longitudinal slope. The contact coefficient of interlayer α larger the maximum shear stress larger, on the contrary, the contact coefficient of interlayer α smaller the maximum shear stress smaller.
Influence Analysis of Roadway Friction on Shock Wave Attenuation
Authors: He Ning , Qin Bin
Published: June 2012

Friction is the extremely important factor when considering the interaction between the shock wave and the tunnel wall. But so far, the impact of wall friction on the shock wave is mainly measured by experimental methods. This paper mainly discusses the effect of wall friction on the shock wave attenuation, without considering roughness, roughness elements, the viscosity of air, and the complex relationship between them; the numerical simulation calculation model is established with DYNA calculation software; the influence law of friction coefficient on tunnel shock wave propagation and attenuation is given based on friction coefficient between air medium and tunnel wall, so as to provide guidance to mining, reduce the impact of tunnel explosion shock wave on personnel and equipment and provide a design basis for shaft safety works.
Crash Hazard Comparison between Rural and Urban Road Segments Based on GIS and Logistic Regression Technology
Authors: Wang Bin , Yan Xue Dong , An Mei Wu , Zhang Cui Ping , Ma Lu
Published: June 2012

Traffic safety in rural and urban areas is a serious public issue worldwide. In this paper, the weighted hazard index (WHI) was adopted to describe risk distributions in rural and urban areas. At the beginning, the WHI analysis results were shown in the GIS-based maps and the visual display of the hazardous segments was illustrated by ArcGIS software, which would help policymakers to assume more targeted improvement measures. Then logistic regression is introduced to assess the difference of incidence of total crashes and incidence of the fatal/injure crashes between urban and rural areas. Based on the estimation results of logistic regression analysis, the ADT (average daily traffic) and length of segments have more evident impact on the two risk factors, namely the incidence of total crashes and incidence of fatal/injure crashes. Furthermore, the differences between rural and urban areas are obvious in total crashes and fatal/injure crashes and more specifically they are all lower in rural areas with other attributes being fixed.
Study on the Wind-Sand Flow Movement Characteristics and the Shielding Effect of the Wind-Break Wall along the Railway in Gobi Area
Authors: Cheng Jian Jun
Published: June 2012

Based on the large number of field surveys and long-term monitoring data of Hongceng, Hongliu and MengliuDong monitoring points, the wind-sand flow movement characteristics along the railway in Gobi area was analyzed. The shielding effect of the wind-break wall was evaluated by the methods of numerical simulation and field test. Conclusions drawn as followings: the wind-sand flow movement in Gobi area is characterized by stable of direction, seasonal, high-velocity,long-term,and shorting of starting-up time and moresand content. Numerical simulation shows that the wind flow form a large vortex region on the leeward side of wall, the flow field elements occurs significant changes. Both field test data and numerical simulations indicated that 3.0m height of wind-break wall meet the requirement of shielding wind-sand flow.
The Effect Analysis of the Plate-Stone Berm Structure on Safety of Anti-Thawing of Roadbed in Qinghai-Tibet Railway
Authors: Li Wen Ying , Wang Chun Lei
Published: June 2012

The plate-stone berm is an active cooling foundation to resist thaw. The Qinghai-Tibet Railway have been widely adopted the plate-stone berm to maintain the safety and stability of roadbed. Structure of the plate-stone berm have great effect on the safety of anti-thawing of roadbed. Different structure in one engineering measure cause different effect. Relying on the experimental segment in the region of Naquhe of Qinghai-Tibet railway (between DK1561+975～DK1562+530),the paper study the most safe anti-thawing structure by numerical analysis: The sunlit side height of plate-stone berm(dia. 20cm) is 1.1m, the sunless side is 1m. The sunlit/sunless side width is 6m/4m. The result is similar to practical test, which show that this method can use into engineering analysis.
Research on the Law of the Infuence on Multilayer Slope Load to the the Different Gradient High Slope Stability
Authors: Wu Jin Liang , Zhang Yong Xing
Published: June 2012

In recent years, domestic superelevation embankment common occurance, This paper uses the finite element strength reduction method, analyzing the stability about high embankment and high embankment multilayer under multilayer load with large-scale finite element analysis software named ANSYS, it is researched on the law of the infuence on multilayer slope load to the the different gradient high embankment stability.
Research on Permeability Regularities in Subgrade behind the Bridge Abutment
Authors: Zhang Zhuo
Published: June 2012

On the hypothesis of that the compacted soil was isotropic body and water movement complied with porous model of Green-Ampt, the permeability models in subgrade behind the bridge abutment with crack that is full of water were put forward by Darcy laws. In order to test the reasonableness of theoretical analysis, the flow mode test was conducted in the lab. The test results show that there is a linear relationship between horizontal length of wetting front on top of subgrade with the square root of time, in the sections at the bottom of crack, it is two time function relationship between vertical distance with horizontal length of wetting front. The test results are consistent with theoretical analysis.
Wireless Remote Health Monitoring System Based on GPRS for Mountainous Highway Subgrade along Reservoir Bank
Authors: Yan Zong Ling , Li Hai Ping , Chai He Jun
Published: June 2012

Health monitoring is an important means for researching dynamic changing rules of deformation stability of subgrade along reservoir bank in mountainous area. The key parameters are chosen considering that highway subgrade is linear engineering, and monitoring points distribute widely and dispersively. A remote health monitoring system is set up based on GPRS technique which provides long distance wireless transmission of health monitoring data for mountainous highway subgrade along reservoir bank. So as to analyze health of subgrade along reservoir bank and discover potential disease timely which provide scientific basis for construction decision, safety operation and subgrade disease prevention and control.
Study on Temperature Shrinkage Problem of Oblique-Reinforced Transverse Prestressed Continuous Concrete Pavement
Authors: Cai Hua , Miao Jian , Jiang Ke
Published: June 2012

Aiming at different kinds of transverse joints of common concrete pavements, this paper puts forward oblique-reinforced transverse prestressed continuous concrete pavement, and compares it with other reinforcement types of continuous pavements in their mechanical and deformation behaviors under the influence of temperature drop. Analysis results show that oblique-reinforced transverse prestressed concrete pavement could take advantage of deformation transfer competence of oblique steels, and while applying prestressing force on slab along transverse direction, longitudinal prestressing force appears which would effectively counteract temperature shrinkage stress along driving direction. Thus this paper provides corresponding theoretical support for the feasibility study on jointless concrete pavement.
The Research on the Application of the Steel Slag Produced by the Converters of Jigang Group Co. Ltd on Base Course
Authors: Lu Fa Liang , Li Jin
Published: June 2012

To test and inspect the chemical compositions and mechanical properties of the steel slag produced by the converters of Jigang Group co. ltd, and study the feasibility of using the steel slag as base course material. Prepare cement stabilized steel slag specimens with different contents of cement mixed for the unconfined compressive strength test. Determine through test its strength after 7 days and 28 days and its water stability after 7 days’ soaking. Prepare in the same method of two different kinds of cement and coal ash stabilized specimens with different contents of coal ash mixed for the unconfined compressive strength test, to test its strength and water stability. The comparison on mechanical property with cement stabilized macadam indicates that the cement stabilized steel slag and cement with coal ash stabilized steel slag both have favorable mechanical property and water stability and the steel slag produced by the converters of Jigang Group co. ltd can be popularized for use as base course material.
Model of Level of Service for Urban Expressway Cloverleaf Interchanges
Authors: Zang Xiao Dong , Tang Yuan Hong
Published: June 2012

Analyzing the insufficiency of research on the Level of Service(LOS) of the urban expressway interchanges in China, Building an evaluation index system of Level of Service (LOS) based on field data, which takes relative delay as quantitative index based on the hypostasis of LOS, it is the ration between the difference of actual time and free time and the free time, setting up the theoretic calculating models of the free driving time and the actual driving time on urban expressway cloverleaf interchanges, then the relative delay can be calculated.
Study on Location Planning of Regional Parking
Authors: Zhang Xin Jie
Published: June 2012

Parking difficulty is being a highlighted problem in nowadays' cities. As a reality of planning of parking lots in Chinese cities are later than other countries, and also parking lot planning are based on city blueprint and needs of parking places, as well as limit of making parking lot plan, we can make a model on planning and choosing parking lot fields to find the most suitable scheme. Thus it can bring the greatest benefit to the whole area in the city, and also make a reference to planning of the parking lot construction in area.
Research on Transportation Structure Model of Dispersed Multi-Center Urban Based on Urban Rail Transit
Authors: Zeng Xiao Qing , Cao Kai Xiang , Zhu Yun Yun
Published: June 2012

This paper researches the influence of urban rail transit based transportation structure on development of dispersed multi-center city. After the studies of the features of urban rail transit and characteristics of city forms, we constructed the snowflake-shaped transportation structure model of dispersed multi-center city, which took urban rail transit as the backbone of transport network. Finally we analyzed the feedback effect from urban rail based transportation to the development of urban form.
The Study on Transport Organization Process Design of Self-Supporting Railway Company
Authors: Shi Fang Tong , Sun Hong Sheng , Li Hong Feng , Guo Ya Peng
Published: June 2012

This paper explains and demonstrates the operation mode and management characteristics of self- supporting railway company. According to these characteristics, the paper designs and analyses process framework of primary business for local railway company. And it designs the process of transportation planning, transportation scheduling operation, train operation organization and freight organization respectively based on the idea of self- supporting management mode. Finally, this paper analyses the advantages of transport organization process design for self- supporting railway company.
Study on Freight Traffic Flow of Port
Authors: Ji Shou Wen , Wang Lin Shuai , Ding Kai
Published: June 2012

There are clear industrial characteristics of freight traffic flow in port. According to the round distribution method, the uneven distribution of time, functional orientation of road network and properties of mixed flow road are analyzed with the example of Lianyungang.
The Study on the Safety of High School Students’ Bicycle Traffic in Beijing
Authors: Ji Dao Yuan , Liu Chang , Li Ya Dan
Published: June 2012

It is an environment-friendly transport for high school students go to school and go home by bicycle. It’s easily cause traffic accident and traffic jam owing to the time of high school students go to school and leave school is concentration or the circumstance of traffic flow mixed motor vehicle and bicycle, and the vehicle and bicycle scrambles for roads. This paper takes high school students go to school and leave school by bicycle as objects, studies bicycle traffic conflicts in two-phase intersection and the factors of insecurity, proposes the improvement measures for security. In this paper, taking T-shaped road junction ZaoJunmiaodonglu and Zaojunmiaolu in front of High school Attached to Northern Jiaotong University as example and using empirical analysis method to study.
The Walkability Assessment of Lishan Road: A Case Study in Jinan, China
Authors: Wang Lei , Jiang Yan Ling , Li Zhen Jia
Published: June 2012

Walkability reflects the overall support for pedestrian travel in an area. As for the walkability survey on Lishan Road, the audit instrument is designed based on the PEDS which put forward by Maryland University. This paper modifies and presents a standardized audit tool for use in Chinese road, of which content is more comprehensive and can be applied to most kinds of roads. Based on the pedestrian environment data of Lishan Road, the Kappa and percent of agreement are calculated to test the reliability of survey results by use of Minitab 14.0. Finally, the outcome is used to assess the safety, amenity, accessibility, aesthetic and convenience of pedestrian environment on Lishan Road.
Comparison of the Evacuation Softwares in the Applications of the Railway Station
Authors: Chen Rui Yu , Lu Shou Xiang
Published: June 2012

With more and more railway stations constructed as well as the development of rail transportation system, the safety of the occupants in railway station has drawn people's attention. This paper adopts FDS+Evac and buildingEXODUS to simulate the evacuation of Hefei south railway station, By comparing the results produced by the two softwares and analyzing the individual characters of the two softwares, we get that the evacuation time of the two simulations produced by the two softwares are very close, while occupants' selection of exits, number of occupants through the same exits and the evacuation routes in the two simulations are different. Besides, buildingEXODUS can save more computation sources and time and is easier and convenient to debug.What's more, the place and the time of the congestion exist in the two simulations are also different.
Optimizational Model of Transit Line Chosen
Authors: Liu Wen Bin
Published: June 2012

In the paper,using graph theory,set theory and iteration,we give gradual search algorithm with number of transfer acting as parameter. Through dealing with data of traffic line, line is united in algorithm,and computational model is simplified. Through optimization of left and right in circuit site and same line repeating site, the shortest timing function in circuit is realized. We consider the subway and walking time of all sites furtherly.
A Decision Making Model for Urban Mass Transit Planning
Authors: Li Cheng Bing , Yang Kui
Published: June 2012

The urban transit network planning is considered as a group decision making problem with multiple objectives and multiple decision makers, due to the its planning characteristics. A new group decision making method is presented to overcome the problem in current group decision making. With the idea of integration and collaboration, the group decision making problem is turned into the group decision making with multiple objectives and decision makers, and the two stage decision model is established. The dynamic index is transformed into static index with the dynamic multi-valued context, and the first stage decision model is established by entropy weight theory. The weight is given by experts with cluster analysis, and the aggregation model of group decision making is established with relative entropy, in the second stage.
Hub-and-Spoke Airline Network Design Method and Application Based on Gravity Model
Authors: Han Lie , Zhang Ning
Published: June 2012

Considering that lengthened transit airline route will reduce the quantity of customers in hub-and-spoke airline networks, the saved cost and reduced quantity of customers must be traded off when hub-and-spoke networks are designed. We apply gravity model to indicate the influence of quantity of customers due to different selection of hub airports. This paper presents a new network design method and mathematic optimization model whose object is to maximize total social net welfare. The hub-and-spoke network of Chinese fifteen cities is constructed using this method to demonstrate the effectiveness and practicability of this model.
Prediction for Percentage of Vehicle Entering Expressway Rest Area Based on BP Neural Network
Authors: Shen Xiao Yan , Liu Hao Xue , Liu Jia
Published: June 2012

In order to scientifically decide the percentage of vehicle entering expressway rest area, based on analyzing the influencing factors relating to the percent of mainline traffic stopping, a BP neural network prediction model for it was put forward. Finally, The Xinzheng Rest Area (XRA) was taken as an example for verifying the feasibility of the prediction model and determining the influence degree of the Shijiazhuang-Wuhan high-speed railway on the percentage of mainline vehicles entering XRA. The result shows that the model had a high precision and reliability.
Inventory-Transportation Integrated Optimization Problem in Many-to-Many Distribution Network
Authors: Pei Ying Mei , Ye Chun Ming , Liu Li Hui
Published: June 2012

In order to solve the Inventory-transportation Integrated Optimization problem (ITIO problem) in a distribution network consisting of many warehouses and many retailers, the Lagrange multiplier method, the scenario-based Dynamic Slope Scaling Procedure (DSSP) heuristics and the Lagrangian relaxation-based DSSP heuristics were applied to integrate the system of inventory control and transportation scheduling respectively and in proper sequence. The more efficient Lagrangian relaxation-based DSSP heuristics is found in solving the ITIO problem. And furthermore, the comparative experiments prove the heuristics can get the optimized results in less calculating time and the efficiency of this method is also proved in solving the ITIO problem in a many-to-many distribution network.
Monitoring of Long-Span Self-Anchored Arch Bridge Constructed with Rotation Method
Authors: Hu Juan , Sun Xiao Yi , Jiao Sheng Jun
Published: June 2012

In recent years, rotation construction is widely used in construction of arch birdge, and the method of construction is difficult and has complicated process. Construction process control for rotation construction of the long-span anch bridge is not only the key measure to ensure the states meeting the design requirements of the constructed bridge, but also is the important part to ensure the construction quality and safety. Therefore, it is necessary to control the construction for the long-span self-anchored arch bridge. The paper established the control system according to the rotation constrcution for the long-span self-anchored arch bridge which is overpass a exited major highway. And took a follow-up observations for the actual states of the constructing arch bridge, and used the finite enlement software ANSYS to analyze the stress of the structure and static and dynamic stress in the process of rotation construction. Comparing the theoretical value to the measured results showed that there was good meet between the results. And the rotation construction was stable, the vertical displacement and the acceleration were smaller, and didn’t take a bad effects on the structure. According to the results of the finite element and monitoring, it will provide the target of the construction monitoring for each construction segment, and meet the final design of the bridge, furthermore it will provide a reliable reference for the smooth progress of construction.
Research on Parametric Modeling and Computing of Multi-Tower Suspension Bridge Based on ANSYS
Authors: Zhang Jin Quan , Zhao An , Song Jian Yong , Yang Yun
Published: June 2012

Based on FEM program ANSYS and the OpenGL graphics, this paper develops the parametric modeling module and the computing module of the multi-tower suspension bridge, this module being embedded into the ANSYS system, and the parametric modeling module parameters can be entered by way of interface, which establish fast a multi-tower suspension bridge model. Calculation module can establish load conditions for the features of road bridge and specifications, in which multiple conditions can be defined and solved automatically. Post-processing part of the solution also for the results of the subtotals and select the output, so that the results of the output and finishing work has become more convenient and easier, and also the results can also be saved in word, excel and other different file types.
Investigation on Nonlinear Dynamics Behavior of Stay Cables under Rain-Wind Induced Vibration in the Consideration of the Restoring Force and the Coulomb Force Comprehensively
Authors: Xiao Yong Gang , Tang Yan , Huang Yan
Published: June 2012

Abstract. This paper consider the restoring force and the coulomb force between the cable and the rivulet comprehensively ,Use Alembert principle to establish two-degree coupled nonlinear motion differential equations of rain-wind-induced vibrations of the cable structure . The equation was analyzed by numerical calculation method with mathematic program . The phase diagrams of cable and water-line were achieved, Also analyzed the effect of the density ratio、viscosity and other parameters on the cable amplitude . Finally through the calculation of Lyapunov performance index obtained the system exist chaotic region. The Phase trajectory and the time-history curve with time extension will be increasingly larger , which can,t be predicted ,thus the chaos phenomenon of system being better interpreted .
Energy Consumption Level of Low-Energy Buildings among Different Climate Zones in China: Case Studies
Authors: Zhang Ke , Zhao Jing
Published: June 2012

According to statistics and field investigation, analyses of the energy consumption (EC) level are on the basis of three low-energy office building cases. These cases locate in three typical cities of different climate zones (North China region-Cold zone, East China region-Hot summer and cold winter zone, South China region-Hot summer and warm winter zone) in China. In conclusions, the energy consumption index (ECI) of these three cases is between 41.06~65.7 kWh/(m2•a). The percentage of EC used for cooling is more than 26.43%, and the outdoor climate conditions influence the total EC level of the whole building.