bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Analysis of Geocell Protective Slope Stability
Authors: Wang Guang Yue , Zhang Jian Peng , Zhao Jian Wu
Published: August 2013

Geocell protective slope is a kind of important ecological protection form, which is widely used in the geotechnical engineering field. Based on the finite element software ABAQUS, and combining with protective slope bodys mechanics performance in shallow soil, the finite element model of geocell slope protection is established under the conditions of rainfall seepage, and then we simulate the shallow and the overall stability of slope in rainfall seepage cases. The results show that the safety factor of slope body increased by about 14% when using geocell slope protection and it reduces the displacement of slope surface effectively, it prolongs the destruction time of the slope under the condition of continuous reduction of soil shear strength, and it further helps reducing the collapse or part of slope sliding of slope disasters.
The Analysis of Stability of Mine's Tailing Dam Based on the FLAC3D
Authors: Li Yuan , Cao Yan Fei , Chang Xiu Jun , Zhang Ya Jing
Published: August 2013

Tailings dam is an important part of engineering construction of tailings pond. Stability analysis of tailing dam is of great significance, because it is the significant security risk of the project of tailings. FLAC3D program which based on Lagrange algorithm is especially suitable for solving the nonlinear large deformation problems in rock and soil mechanics engineering. After the adequate mastery of the soil layer structure, the physical and mechanical properties and the determination of the calculation parameters, the engineering software of FLAC3D and the numerical analysis method are utilized to analyze the integral stability of the tailing dam of Guangxi Xinfa Aluminum Company in Jingxi county. It can provide a scientific basis for the stability analysis of engineering construction of another tailing pond.
Soil Shear Strength Characteristic in Slope Disintegration Area
Authors: Zhang Xiao Ming , Ding Shu Wen , Li Shuang Xi
Published: August 2013

Development of slope disintegration is close to soil mechanic characteristics such as shear strength indices. Soil grain diameter and water content were tested. Soil direct shear test was conducted to analyze the relationship between shear strength indices and the influencing factors. The experimental data indicate that clay content and the range affect soil cohesion value and the scope. Soil cohesion increases with bulk density before 1.6g/cm3. But it decreases when the bulk after that. The results could provide a scientific basis for control of slope disintegration.
Design Scheme and Construction Technology of Combined Support for a Deep Foundation Pit Excavation
Authors: Wu Mai , Zhao Xin , Liu Kai , Wang Chun Lei , Geng Hui Xuan
Published: August 2013

A deep foundation pit project in Changsha City covers an area of about 63000m2, the largest excavation depth of the pit is 16.2 m, so it belongs to the deep and large foundation supporting engineering. By comprehensive analysis of the proposed construction site environment conditions and engineering geological conditions the different combined supporting schemes are adopted in different domains separately. In this paper the design schemes of the combined supporting technology are introduced. The problems encountered in the excavation construction process and the corresponding measures being taken are analyzed in detail. The results show that the design scheme is reasonable. Both horizontal displacement and settlement can meet specification and design requirements. At the same time the reasonable construction organization makes the support engineering be finished within the scheduled term, which saves the precious time for the following construction procedure. Furthermore it provides guidance for similar projects.
Prediction of Ultimate Bearing Capacity of Half-Screwed Pile by Integrated Exponential Function Model
Authors: Liu Jian Xiong , Gao Yan Yan , Li Xiu Hua
Published: August 2013

This study fitted the measured loading-settlement curve of half-screwed pilewith least square model solution of difference form of integrated exponential functional model, and predict ultimate bearing capacity of half-screwed pile according to the fitted curve of maximum curvature point. Combined with practical engineering research, the study explored the feasibility, rationality and limitations of predicting the half-screwed single pile ultimate bearing capacity with least square model solution of difference form of integrated exponential functional model, and provided the theoretical basis for the popularization and application of the half-screwed pile.
The Study of Optimization Design Numerical Simulation on Variable Spacing Pile-Raft Foundation
Authors: Wang Wei Yu , Zhao Tuo
Published: August 2013

Based on practical engineering, numerical analysis model was established by using finite element analysis software. The rules about raft settlement, pile-top counterforce, soil counterforce were analysed after variable pile diameter. It is more favorable on settlement and counterforce after variable pile diameter than Original design. There is important academic significance and application value on pile raft foundation optimal design.
Research on Soil-Water Characteristic Curve of Unsaturated Mixed-Soil in West Sichuan
Authors: Zhou Wei Guang , Bao Yu Long , Zhou Hong Bin
Published: August 2013

A series of tests are conducted to get the physical composition, physical form and the soil-water characteristic curve in different dry density of three typical composite unsaturated soils in west Sichuan. Test data shows that the variation of physical composition, particle size and dry density can result in great change of soil-water characteristic curve. The bigger the dry density is, the more hydrophilic mineral the soil has, the more gentle the soil-water characteristic curve is, and the higher its residual moisture content is. In addition, under the same water content, matrix suction decreases with less clay content and more content. For the three typical composite unsaturated soils, with relatively bigger water content, the change of soil-water characteristic curve resulting from variation of dry density is less, but with the water content getting smaller, the change becomes clearer.
Modeling of Perforated Screens or Membrane Using Rigid Frame Porous Models Combined with Thin Membrane Resonance Sound Absorbing Theory
Authors: Gai Xiao Ling , Li Xian Hui , Zhang Bin , Xie Peng , Ma Zhi Hui
Published: August 2013

The sound absorption ability of screen or perforated membrane is studied based on rigid frame porous models combined with thin membrane resonance sound absorbing theory in this paper. Results show that the sound absorption of screen or perforated membrane is better considering the role of membrane than using the rigid frame porous models when the mass density of screen or perforated membrane is smaller. The rigid frame porous model is very accuracy to model the sound absorption ability of screen or perforated membrane when the mass density of membrane is greater. The parameter studies present that the sound absorption peaks move toward low frequency region with the increasing of the depth of air-back cavity, mass density and thickness of screens or perforated membrane and moves toward high frequency region with the increasing of the perforation and perforated radius of screens or perforated membrane when other parameters keep invariant.
Research on Location of Integrating Village Migration in Coal Mining Areas Based on AHP-Grey Correlation
Authors: Zhang Xiao Hai , Wang Wen Bo , Zhang Shao Min , Zhu Yi Qi
Published: August 2013

In the process of integrating village migration in coal mining areas, the selection of new site of village is important. In this paper, by using AHP and grey correlation of knowledge, combining with the principle of site selection, through the analysis of actual production in Longgu mine, reasonable location method is obtained.
A Study on Citizen’s Preference for Waterscape Design in Urban Open Spaces
Authors: Yu Ning
Published: August 2013

With regard to the problems of waterscape design in urban open spaces, this study is conducted from the citizens’ perspectives, questionnaire survey method and action observation method have been adopted to investigate people of different genders, ages, education levels, and occupations to look into their preference for three kinds of waterscape designs such as community parks, commercial squares, and residential areas in urban open spaces. The results indicate that people’s preference for the aesthetic features, forms, and movement patterns of water, and the relationship between humankind and water have direct relation with people’s overall characteristics and visit purposes. The experience design and culture thematic designs of water serve to broaden the appeal of waterscape designs in urban open spaces and to strengthen people’s senses of belonging.
Risk Analysis of Hydropower Construction Project Based on Fuzzy Comprehensive Evaluation
Authors: Wu Yun Na , Hu Zi Shan , Xu Ru Hang
Published: August 2013

Hydropower construction projects have been faced with more complex risk factors and had higher demands on technology in recent years. It is how to do the risk assessment and management that have been the focus of hydropower project management. In the basis of the analysis of risk factors of hydropower projects, this article has adopted analytic hierarchy to construct the hydropower project risk evaluation index system, and presented 9-scale method in accordance with human experience and judgment to make quantitative risk assessment of the risk factors by weight vector system. With the construction of the risk fuzzy evaluation model and the analysis by examples, it is proved that the fuzzy comprehensive evaluation method has the applicability for hydropower project risk analysis, which combined qualitative analysis and quantitative analysis to strengthen the regulation and evaluation effectiveness.
Program Evaluation and Review Technique (PERT) in Construction Risk Analysis
Authors: Liu Mei
Published: August 2013

Construction project scheduling is one of the most critical factors for project success measurement. Critical Path Method (CPM) is commonly used in the construction industry for project scheduling. CPM is a deterministic method that ignores uncertainties in activities through the network, which determines the duration of the projects. Program Evaluation and Review Technique (PERT) is a probabilistic method based on the assumption that the duration of a single activity can be described by a probability density function. PERT takes into account the uncertainties during the construction process to plan, schedule and control complex projects with many uncertainties. The work reported in this paper describes the PERT work process to carry out the construction schedule risk assessment and illustrates the model through case studies. The utilization in the estimate the construction liquidated damage with the uncertainties is performed, which also can be used in the insurance company to calculate the insurance premium.
Contractor Evaluation Model for Large Project Based on Grey Relevancy
Authors: Zhang Wei , Yang Yun , Liu Wei
Published: August 2013

Large projects often face risks from technology, economy, nature, social and other aspects during development and construction. This paper describes a reasonable decision-making method of the general contractor based on Grey Relevancy. The primary weights of factors and evaluation of alternatives are determined by applying AHP. An illustration is presented to demonstrate the application of the method in contractor evaluation. The results are consistent with the results calculated by conventional contractor evaluation method. The research demonstrates that the method is objective and accurate, and is of an application value in the contractor evaluation.
The Problems in PPP Project Decision Process in China Comparing with Singapore
Authors: Qi Xia , Yi Chao , Li Jie
Published: August 2013

PPP project success not only depends on governmental credit and private sectors capability, but also relies on the scientific and reasonable evaluation in early decision-making stage. By thoroughly research on Singapore PPP project decision-making mechanism, deficiencies of current policy system, government supervision and evaluation mechanism in decision process of PPP project in china were summarized. Based on the findings, the proposal to improve legal framework, policy and regulation system, institutional settings, evaluation technique system as well as other aspects of PPP implementation were put forward.
An Exploration of Sustainable Development of Indemnificatory Housing Based on the Idea of Mixed Housing
Authors: Hou Xiang Chao , Zhang Jin Yue , Fu Min , Xu Yong Tie
Published: August 2013

This study focuses on finding the means for the harmonious and sustainable development of the people, resources, and environment of indemnificatory housing areas, as well as the prevention of the concomitants occurred in precedent countries, for example environmental deterioration, polarization between rich and poor, and social instability. It is elucidated in this paper that the government should provide residents of indemnificatory housing areas with diverse and humanized basic housing conditions and management services under the guidance of the idea of mixed housing, while follow the principles of open structure, elaborate design, shared facilities, environment friendly, and cooperative management. In addition, in this paper we demonstrated with practical examples that Harmonious Housing Mode is a sustainable development mode for indemnificatory housing.
Research on BIM-Based Construction Project Organization Interface Management
Authors: Liu Hong Lei , Wang Guang Bin , Zhang Lei
Published: August 2013

There are many participants in one construction project, however there is no direct contractual relationship between some of them and lots of disputes, claims, problems occur on organization interface, which result in great waste and low efficiency. BIM (Building information modeling) is an innovation idea and benchmarking technology which has great impact on organization and can improve the collaborative efficiency of all construction organizations. The present problems in traditional construction project organization interface management are analyzed firstly. And then, value of BIM which is applied to solve the present problems in organization interface management is analyzed and summarized. Finally, project collaborative environment logic structure at the base of BIM is constructed to achieve maximum performance of project management.
Prehistoric Human Activities and its Environmental Background in Central China: A Case Study in Henan Province
Authors: Li Zhong Xuan , Wu Guo Xi
Published: August 2013

Based on amount change and distribution density of the Neolithic sites in Henan Province, these sites are divided into three types: (1)the Growth type. This type is mainly located in Luoyang Basin where the landform was convenient for millet-farming and settlement-clustering. (2) the Atrophy type. It mainly sits in the Nanyang Basin in which was a transition zone for cultural exchange. And (3) is the Oscillation type. This type distributes around the area of Yinghe-Ruhe River downstream with low land and frequent floods, which affected the amounts of sites in respond to series climate fluctuations in the early and middle Holocene. Comparatively, the unique terrain environment and water networks in the Luoyang Basin heralded the earliest civilized fruit in China and to be the cradle of early cultural transmission.
Green Building Technology of Regional Suitability Evaluation System Research and Case Study
Authors: Zhao Peng , Niu Yan Tao , Xie Lin Na , Wang Zhi
Published: August 2013

One of the most important things in green building is green building technology selection. Because green building has different requests in different location, this report uses Fuzzy comprehensive evaluation method which based on Analytic hierarchy process to establish of green building technology of regional suitability assessment system. The factors of evaluation in assessment system include: technical feasibility; the standard maturity level; protection of supporting; technical failure rate; economic benefits; ecological benefits; negative impact on the environment. Evaluation of roof greenings applicability in Beijing is used to verify this assessment system feasibility.
Design Principle of Interior Air Environment Based on Passive Ventilation Idea
Authors: Yuan Li Juan , Meng Cong Lin
Published: August 2013

Wind energy is one of the most important energies on Earth. It can be used in many ways, such as wind power generation and interior air ventilation promotion, while the latter is the main way of using wind energy for green building. Under the full range guidance of passive design concept, it uses idea that advection leads heat to flow through building naturally, and control the heat flowing direction by building performance, to achieve a cooling effect without any special machinery and equipment.
Ultrasonic Testing of Lightweight Fine Aggregate Concrete in Time and Frequency Domains
Authors: Kim Jee Sang , Yoo Kyung Suk
Published: August 2013

Non-destructive techniques (NDT) have been used to assess the condition of existing concrete structures, to predict future performance, and to monitor the conditions of repaired systems and so on. One of the widely known NDT is the ultrasonic pulse velocity (USPV) method, which determines the travel time of the ultrasonic pulse through the tested material. Most studies were focused on the results expressed in time domain. However, the signal of ultrasonic pulse in time domain can be transformed into frequency domain, through Fast Fourier Transform (FFT). This paper shows a comparison of changes in the pulse velocity and frequency domain signals of concrete for various load histories using lightweight fine aggregates. The results demonstrate that the signals in frequency domain of ultrasonic pulse of lightweight fine aggregate concrete does not show any significant difference comparing with those of normal concrete. The reduction trend of peak frequency was found to be more influenced by the stress levels rather than the ultrasonic pulse velocity.
Experimental Study of Alkali-Activated Red Mud Cement Material
Authors: Zhou Min , Ji Yong Sheng , Chang Zheng , Zhang Chan , Yan Xing Tong
Published: August 2013

In order to use the alkaline ingredient in red mud, this paper studied the strength variation law of alkali-activated red mud and lime cement material combined with slag. When the content ranged from 0 wt% to 20 wt%, the experiment showed that the flexural strength increased when the content increased, and the compress strength increased when the content increased with the content ranging from 0 wt% to 15 wt%. When the content reached 25 wt%, the strength of alkali-activated red mud cement material was equal with alkali activated slag cement. The SEM test of alkali-activated red mud cement material showed that red mud and lime both participated in hydration reaction fully.
On the Application of Decoration Materials in Architecture
Authors: Jia Qiong , Zhou Yue , Shen Yan Ni
Published: August 2013

Decoration materials, as an essential part of architectural design, play a prominent role in the success of the entire architectural design. It not only meets the environmental requirements but embodies aesthetic value to some extent. Starting from the selection and application of decorative materials, this paper explored the method of decoration materials application in buildings from the perspective of how to achieve a perfect combination of decoration materials and detail design of a building and how decoration materials echoes with the built environment. In the understanding of material properties,as a full integration of design and technology and art was realized, construction quality was improved. Keywords: building; decoration materials; detail design; environment; new materials; application
Preparation and Storage Stability of Asphalt Emulsions Made from Modified Lignin Cationic Asphalt Emulsifiers
Authors: Liu Zu Guang , Zong Lei , Zhao Le Le , Xie Xiong Min
Published: August 2013

The asphalt emulsions were prepared using modified lignin amines as cationic emulsifiers. The effect of types and dosage of lignin cationic emulsifiers on the preparation and storage stability of asphalt emulsions were discussed by measurement of average particle diameter and Zeta potential of emulsions. The experiments show that the higher the surface activity of emulsifiers was, the smaller the average particle diameters of emulsions became. With the increasing of dosage of emulsifiers, the average particle diameters of emulsions descended. The storage stability of emulsions was improved distinctly when the lipophil dodecyl group was introduced into emulsifiers, which was attributed to good surface activity and enhanced mechanical strength of interfacial membrane for the alkyl chain of dodecyl group could be inserted in the asphalt particles.
Study on the Loss and Degradation and Sustainable Development Countermeasures of the Coastal Wetlands in Qinhuangdao
Authors: Peng Yan Dong , Wang Jing Yue
Published: August 2013

Qinhuangdao coastal wetland is the distribution of China's most representative of the sandy coastal wetlands, and its main wetland types are sandy coast wetland, rocky coast wetland, estuarine wetland, lake wetland, shallow sea wetland and artificial wetland. Under the influence of natural factors and human factors, coastal wetlands degradation constantly. Land reclamation, city and port development, pollution, coastal erosion and excessive use of coastal biologic resource are considered as the main factors to the degradation of the coastal wetlands. Based on the analysis the main factors contributing to the loss and degradation of the coastal wetlands and the characteristics of wetland degradation, sustainable development countermeasures are suggested in this paper.
Comprehensive Evaluation on Exploitation and Utilization of Water Resources Based on Improved Fuzzy Pattern Recognition Model
Authors: Chen Hua Wei , Fan Ming Yuan , Huang Ji Wen , Zhang Xin , Liu Hai Jiao , Fu Shi Dong
Published: August 2013

Through identifying the exploitation and utilization of water resources system, this paper establishes an improved fuzzy pattern recognition model by combining fuzzy matter-element model with the improved entropy evaluation method and sets up the comprehensive evaluation index system which includes 3 layers and 10 indicators from two aspects: water utilization efficiency and water ecological environment. The proposed model and evaluation index system are applied to evaluate the comprehensive exploitation-utilization grade in Shandong Province. Results show that the exploitation-utilization of water resources and water ecological environment are not balanced in Shandong province, this indicates that the growth of ecological benefits and the protection of water ecological environment are ignored in the process of water resources exploitation-utilization.
The Effects of Alkaline Treatment on Excess Sludge Supernatant Characteristics
Authors: Li Ting Ting , Fu Zhi Min
Published: August 2013

The effect of alkali treatment on excess sludge supernatant characteristics was studied in this experiment. 4 mol/L sodium hydroxide solution was utilized to adjust the initial pH value of excess sludge to 9.0, 11.0 and 13.0. Batch experiments were operated in 35 °C shaking bath for 12 h. The soluble chemical oxygen demand (SCOD), protein and polysaccharide concentration in excess sludge supernatant was measured every 3 h. The experimental results showed that maximum amount of protein, polysaccharide and SCOD were obtained when the initial pH value was 13.0.
PAHs Formation Routes in the n-Heptane Laminar Flow Premixed Flame
Authors: Zhang Yun Peng , Wei Xiang Yang , Huang Xing , Zhong Bei Jing
Published: August 2013

A detailed reaction mechanism is adopted to simulate n-heptane laminar premixed flame in this paper. The reaction mechanism comprises 108 components and 572 elementary reactions. The main reactants (O2,n-C7H16), reaction products (CO2,CO,H2,H2O), intermediate products (CH4, C2H4, C2H2, C3Hx) and the concentration distribution of PAHs in the flame are analyzed in the numerical method. The numerical results are in good agreement with the experimental results, which states that the mechanism can predict PAHs in the n-heptane flame. In this paper, the sensitivity and reaction flow analysis method is used to analyze the numerical results and the PAHs formation routes in n-heptane laminar flow premixed flame are obtained.
Study on the Static and Dynamic Load Test of Ramp Bridge
Authors: Zhao Qing Yun , Wang Lei , Yu Shi Hua , Lu Zhi Qiang , Sun Yue Long
Published: August 2013

Ramp bridges are usually curved girder bridges, and show unique mechanical characteristics under live load. On the basis of an interchange ramp bridge static and dynamic load test in a radius of 230m, the bridges stress, deflection and dynamic characteristics were analyzed and the bearing capacity was evaluated.
Selection of Anticorrosion Adhesive Layer for Steel Deck
Authors: Yan Chun Xia , Li Zhi Guo , Su Bo
Published: August 2013

In order to solve the problems of the pavement delamination or slip caused by the failures of waterproof adhesive layer or anti-corrosion coating, the epoxy zinc-rich paint, the epoxy clear water paint and epoxy asphalt adhesive material with good performance was selected for the roughness-adhesive force test, tensile test under different temperatures and corrosion resistance test. The optimal anti-corrosion layer and adhesive layer were selected to increase the service life of the steel deck pavement. The test results show that: When the steel roughness is 60μm, the anti-corrosion material has the highest adhesive strength with the steel plate. Both the epoxy zinc-rich paint and the epoxy water paint have high adhesive strengths with the steel plate at room temperature. But at low temperature, the adhesion performance of the epoxy water paint is significantly better than that of the epoxy zinc-rich paint. At 70 °C, the adhesive strengths of both the epoxy water paint and epoxy zinc-rich paint adhesive system greatly decrease. The destruction morphology shows the opening of the adhesive layer. The specialized anti-corrosion coating must be brushed on the steel deck.
The Space Model of Urban_Rural Integration in Sparsely Populated Areas - Taking ETuoKeQianQi as an Example
Authors: Yang Huan , Zhang Pei
Published: August 2013

The reasonable structure of urban_ rural space is an important way to achieve the integration of urban and rural areas, so this paper researched the space model of urban and rural areas ,aiming to find the suitable spatial structure in sparsely populated areas .First, the paper expounded the concept of the rural and urban spatial structure , studied the relationship between urban_rural areas and its development stages, based on this, this paper used the induce deduction, experience learning and case analysis methods to construct the spatial patterns of urban _rural integration in sparsely populated areas, and finally taking ETuoKeQianQi for example to demonstrate this model.
Research on Development of Arch Tower Cable-Stayed Bridge
Authors: Cao Yi Shan
Published: August 2013

In recent years, the arch tower cable-stayed bridge were widely used. 19 arch tower cable-stayed bridges built or under construction at home and abroad were investigated and summarized in design technology. Involves mainly include: span arrangement form, ratio between side span and main span, height-span ratio, the form of arch axis, structure form of tower and main girder. Research results can provide reference for the engineering designers.
Analysis of Large-Span Steel Concrete Railway Arch Bridge Suspender Tension
Authors: Xu Jia Lin
Published: August 2013

In this paper the concrete-filled steel tube concrete arch bridge as the research object, through the finite element program MIDAS, analyzes the internal force of the whole bridge, determined the distribution of internal force and the most unfavorable position; Using the force balance method, taking the reasonable stress of the bending moment status to control goals, determines the boom of the bridge as the condition of reasonable internal force; Use fall down method, according to the reverse sequence in order to cut the boom, each cut as a model for internal force calculation and analysis, get the next will be cut derrick's internal force, its value is the order construction boom of the initial tension.
An Acceleration Sensor Placement Method Considering Network Life Cycle for Vibration Monitoring of Bridges
Authors: Zhang Wei Dong , Wan Jun , Ai Yi Bo , Yang Bin
Published: August 2013

Vibration is a very important signal for the health monitoring of bridge. Wireless sensor network powered by batteries are widely used in the monitoring system. How to prolong the network life cycle becomes an important problem due to the limitation of battery energy. This paper presents a new method of optimal acceleration sensor placement for monitoring the vibration of bridges, the method considers network life cycle as the second target on the basis of traditional modal assurance criterion (MAC). And multiple-objective optimization is performed by using a genetic algorithm. The simulation result shows that when the sensors number is less than 30, the networks life cycle can be greatly extended with the addition of only the little cost of MAC indicators.
Theoretical Study of the Spherical Bearing Rotational Torque
Authors: Peng Tian Bo , Shi Xian Fei , Han Lei
Published: August 2013

A theoretical analysis model to calculate the spherical bearing rotational torque is established based on two assumptions: a) The spherical cap suffers uniformly distributed pressure along the convex surface, pointing towards the center of the sphere; b) The pressure on the rotating plate imposed by the spherical cap flat surface is distributed as a right trapezoid. Compared with the test results, it can be found that the value calculated according to the theoretical formula is closer to the experimental value than that calculated according to the code. Keywords: spherical bearing, rotational torque, bearing design, bearing test.
Stability Impact Analysis of Random Dead Load Distribution to T-Rigid Frame Bridge Swivel Construction
Authors: Che Xiao Jun , Zhang Xie Dong
Published: August 2013

Due to limitations of construction conditions, the swivel construction method is the preferred even required program across the highway and railway bridges. The constant contained eccentricity of swivel bridge cantilever state has a great impact on the overturning stability of swivel process. Combined with the T configuration swivel bridge engineering instance, based on the basis of data collected loads, loads theoretical model, in line with the objective variation and the scientific process and selecting the representative value of the load was explored, the cantilever pouring weight corresponding probability distribution model was analyzed, and the impact to the stability of the bridge swivel construction process was studied. The analysis of data can ensure the bridge maximum cantilever state security, as well as to provide the basis for command and decision-making of the swivel stage.
The Nonlinear Finite Element Analysis of Prestressed Concrete Box Girder
Authors: Zhou Meng Chan , Liu Qun Yang , Su Jun
Published: August 2013

Using Midas/Civil, a nonlinear finite element software, to establish solid element, analyse the process of the construction of a prestressed concrete simply supported box girder which length 32m, this box girder is located on the Shijiazhuang-Wuhan Passenger Dedicated Line, gained the maximum stress and displacement at the control section. Comparative analysis of the simulation results with the monitoring data which gained at the construction site, The results of both are substantially the same, achieve the purpose of assessing the safety of the construction process and the reasonableness of the structure model about the box girder.
Analysis of Integral Abutment Bridge Static Load Test
Authors: Yu Tian Lai , Sun Xiao Long , Zhang Su Feng
Published: August 2013

In order to understand the form of deformation and stress characteristics of the integral abutment bridge structures under the loads, this paper bases on Fuyu industrial park crossing bridge, through test vehicle load simulating design load, does a static load test for the bridge, and with the aid of theoretical method to simulate the interaction of pile and soil, builds finite element model, compares between measured and theoretical values of deflection and stress, gets that, the bridge bearing capacity and stiffness is bigger, with sufficient safety reserves.
Study on the Load Test of Xiangjiang Cable-Stayed Bridge
Authors: Sun Yue Long , Wang Lei
Published: August 2013

Xiangjiang Bridge is a newly built bridge. In order to understand the actual working condition and the bearing capacity of the bridge, the static and dynamic tests are carried out. This paper describes the principles and methods of the load test and the measurement of the stiffness and dynamic characteristics of the bridge structure. Through analyzing the test, the data and information of bridge can be accumulated and the mechanical characteristic of this kind of bridge is discussed.
Research on the Influence of Track Structural Parameters on Abnormal Rail Corrugation
Authors: Yang Guang Wu , Peng Hua , Wang Jiani , Cai Xiao Pei
Published: August 2013

To solve the abnormal rail corrugation problem of Beijing Metro Line 4, the track structural parameters comparative tests were carry out in the Metro Line 1,2 and 4. Metro Lines 1 and 2 were chosen based of the Beijing Subway Survey and previous successful experiments. The comparative analysis was based off of rail static geometry, dynamic displacement and the lateral acceleration. The test results proved the stiffness of line4 is weaker than line1,2 and suggestions on steps to prevent and correct the metro rails abnormal corrugation will be formulated.
Construction Technology of Warm Mix Retardant Asphalt Mixture
Authors: Zhao Hong , Wang Xiu Shan , Lu He Quan , Lu Xiao Ling
Published: August 2013

As a new material, the warm mix asphalt retardant asphalt mixture has its particularity in material design, construction proportion, mixture preparation and on-site paving. This paper summarized the construction process and site construction quality inspection requirement of the warm mix asphalt retardant asphalt mixture through tracking research on-site based on the real engineering. It was shown that the road environment quality of using warm mix retardant asphalt was significantly better than normal hot mix asphalt, asphalt smoke, benzene soluble and Benzopyrene decreased 91.47%, 97.05% and 80.11% respectively. Warm mix asphalt retardant asphalt mixture had a low mixing and compaction temperature. When used in the tunnel pavement, it could not only greatly reduce harmful gas emissions in the process of construction, improve construction environment in tunnel, improve the air transparency in tunnel, be convenient for construction quality management, but also can improve the fire resilience of the tunnel pavement after be put into operation. It had broad application prospect in the tunnel pavement.
Experimental Study on Foaming Characteristics of Foamed Asphalt
Authors: Li Li , Chao Zhou , Nian Wang , Qiao Wei Hua
Published: August 2013

This paper presents study on foaming characteristics of two types asphalt with same Penetration-grade 70. Asphalt temperature (AT), water content (WC) and water temperature (WT) were selected for investigation their effects on the asphalt foamability. Maximum expansion ratio (ERMax) and half-life (HL) are important indicators of foamed asphalt. It is concluded that ERMax*HL reachs maximum at optimum foaming condition of foamed asphalt. The conclusion is used as criterion for optimizing foaming condition. The fact that the water temperature influences the ERMax and HL of foamed asphalt significantly was presented.
Influence of Rubber Powder Dosage on Performance of Cement Mortar
Authors: Zhang Yan Cong , Gao Ling Ling
Published: August 2013

A number of rubber cement dosage specimens that rubber powder dosage different were obtained using same cement, water and fine aggregates, by adjusting the dosage of rubber powder. Then it was used to research the influence of rubber powder dosage on performance of cement mortar by measuring its liquidity, strength and toughness. The results show that: when water-cement ratio was equal and rubber powder replacing the same volume sand, the fluidity of cement mortar almost linear increased with rubber powder dosage increasing. With dosage of rubber powder increasing, compressive strength and flexural strength reduced, but toughness linear growth trend when dosage of rubber powder less 30%.
Application of Rubber Asphalt in Urban Road Reconstruction
Authors: Jian Bin
Published: August 2013

Rubber asphalt can significantly improve the road performance of ordinary asphalt,and consume a large amount of scrap tires, turn trash into treasure. The article takes Tianhe Road Reconstruction Project ",in Mianzhu City, as an example, introduces the application of rubber asphalt in urban road reconstruction,and describes the key technical problems in rubber asphalt concrete construction in detail.
Study on the Compilation of General City Planning Guided by Low-Carbon and Ecology
Authors: Li Jun Sheng , Cheng Xing Guo , Li Hui Yong , Gao Hua Li , Sha Zhi Hui
Published: August 2013

How to enrich the contents of the " low-carbon eco-city " in the general city planning level , how to the implement the development goals into actions are the major issues of promoting the realization of the goal of low-carbon eco-city by the general city planning . This paper discusses about this, proposes that we should view low-carbon eco-city planning rationally, identifies the impetus of practical low-carbon eco-city planning, and mainly discourses the practical approaches on the compilation level of general low-carbon eco-city planning.
Properties of Single Face Compacted Porous Asphalt
Authors: Yaacob Haryati , Hainin Mohd Rosli , Chang Fung Lung
Published: August 2013

Preparation of double layered specimen at laboratory scale is important in evaluating the performance of bond strength between pavement layers since it is normally less costly. It however involved single face compaction at wearing course layer during the specimen preparation which raised potential skepticism over the quality of the layer compacted at single face only. This paper presents the properties of single face compacted porous asphalt (SFCPA) specimen compared to conventional double face compacted porous asphalt (DFCPA) specimen. These specimens were of Grading A in accordance with the specification from Malaysia Public Works Department (PWD). The permeability and abrasive loss were investigated for specimens fabricated at 3 thicknesses of 35mm, 50mm and 65mm at an allowable limit of ±1mm. 50 blows compaction at each face according to PWD specification is adopted for DFCPA specimen, which resulted in compacting effort of 100 blows compaction for SFCPA specimen was applied for every thickness. For both tests, SFCPA possessed lower permeability and abrasive losses compared to DFCPA. This observation is the consequences of potential aggregate crushing in SFCPA which then partly filled up the voids within the specimen and reducing the permeability. Increased in density as a result of permeability reduction had increased the interlocking between coated aggregate particles, hence the abrasive loss in SFCPA is lessened.
Spatial Disequilibrium Development and its Policies of Central China: The Case of Hubei Province
Authors: Liu Yun , Chang Li Li , Peng Chong
Published: August 2013

Central China is progressively paving its way to the second carrier of Chinese population after the east coastal areas with disequilibrium theory as the guidance of provincial spatial development. Based on ESDA (exploratory spatial data analysis) with statistical data of GDP per capita of Hubei Province by county-level (2000-2010), this paper reveals the spatial differentiation characteristics of economic differences among counties in Hubei Province. According to global analysis of ArcGIS and GeoDA095i, economic space of the county presents the trend of climbing up and then declining. Besides, differences between counties are remarkable. The LISA clean-cut indicates different developed and underdeveloped districts. Finally, contrasting to policy response that the provinces cope with disequilibrium theory in Central China, the results show that the Central China continues to promote disequilibrium development is a reasonable choice, and it’s also indispensible to pay attention to controlling magnification of differences in regional development.
Research on Application of Warm Mix Asphalt Technology in Central Plant Hot Recycled Engineering
Authors: Wang Qing Zhou , Liu Shu Yan , Li Xiao Li
Published: August 2013

The warm mix asphalt technology was introduced to breaks through the low reclaimed asphalt pavement (RAP) ratio in central plant hot recycled engineering. Firstly, performance tests for traditional hot mix asphalt and central plant warm recycled asphalt mixture with different RAP ratios (0%,40%,50%,70%,100%) were conducted. It was concluded that the performance of warm mix asphalt was as good as hot mix asphalt, and the RAP ratio could increase to 60% by central plant warm recycling technology. Then a practical central plant warm recycled engineering with RAP ratio 50% was analyzed. It was concluded that not only the performance of the recycled asphalt mixture met the standard requirements absolutely, but also the compaction quality of the recycled pavement was improved.
Load Stress of Roller Compacted Concrete Base in Flexible Pavement
Authors: Suo Li Jun , Wang Xin Wu
Published: August 2013

In order to analyze load stress of roller compacted concrete base of asphalt pavement, first of all, threedimension finite element model of the flexible pavement is established. The main objectives of the paper are investigated. One is calculation for stress of roller compacted concrete base in asphalt pavement, and the other is analysis for relationship between load stress of roller compacted concrete base and parameters, such as thickness, modulus. The results show that stress, which is caused by load that is located in the middle of longitudinal joint of roller compacted concrete base of asphalt pavement. Maximum load stress decrease, decrease and increase respectively with increase of the surfaces thickness, bases thickness and ratio of bases modulus to foundations modulus.
Micro-Mechanism Study and Road Engineering Application of Asphalt Rubber
Authors: Li Ting Gang , Li Jin Zhong , Li Wei
Published: August 2013

Based on the results of electron microscope observation, the formation mechanism of asphalt rubber can be explained as followed: both chemical and physical reaction take place when crumbed rubber and base bitumen are mixed together. Physical swelling of the crumbed rubber particles take place during the process, at the same time a layer of gel comes into being on the surface of the crumbed particles, through which the particles connect with each other and form a network structure. Because of the unique formation mechanism of asphalt rubber, the material provide some much better properties than other kinds of bitumen. The main points of choosing raw material and production technology of asphalt rubber is given out based on the results of a series of contrast tests such as different sizes of crumbed, different crumbed rubber content, different reaction time and different reaction temperatures. The good performance of asphalt rubber in the field of road engineering is proven based on the test results of asphalt rubber premix and road pavement.
Analysis of Increase Reason on AC-13 Asphalt Mixtures Voids
Authors: Ping Li , Deng Jia Xi , Tian Shuai Tuan , Bin Wang
Published: August 2013

Using different gradations and different fine aggregates and different molding methods for molding specimens, and calculates the sample porosity, and analyzes the cause of increased porosity of mixture from different aspects. The results show that: the same aggregate and the same gradation, the use of Gyratory Compactor and the Marshall designed method form the small different porosity specimen;
Study on Traffic Impact Assessment of Urban Road Construction Projects
Authors: Wang Miao Miao , Wang Jian Jun , Liang Hong Yan
Published: August 2013

Traffic impact assessment of urban road construction projects is important to ensure that road construction can meet the transport demand as far as possible. In view of this, from the evaluation object, influence scope, traffic surveys and demand forecasts, traffic impact assessment of urban road construction projects is studied. It provides a reference for this work to carry out.
Urban Rail Transit Financial Subsidy Decision Based on Information Fusion
Authors: Liang Hong Yan , Wang Jian Jun
Published: August 2013

The Internet of things technology provides a new model for reference for information fusion. Based on information fusion theory and methods for relative basic data fusion, established the urban rail transit financial subsidy decision model by using the marginal cost method, which assist to decide the urban rail transit finance subsidy policy.
Evaluation on Urban Low-Carbon and Ecological Transportation System
Authors: Jia Jian Min , Zhang Ru Hua
Published: August 2013

With the Fast Development of Economy, Urban Transportation Problems, such as Traffic Congestion, Energy Consumption and Pollution Emission, is Becoming more and more Serious. to Deal with this, Low-Carbon and Ecological Become Significant for Urban Development, and they are the Evaluation Criterions for Urban Transportation Development. Based on the Former Research on Transportation Evaluation, we Add Evaluation Indexes about Pedestrian and Bicycle, which Completes the Evaluation System. Whats more, we Combine the AHP and Coefficient of Variation Method while make Evaluation, which is Different from the Traditional Evaluation Method. Finally, in Order to Test the Evaluation System and Evaluation Method in the Paper, we Choose Jinan as the Example.
Study on Multi-Objective Optimization Model for VMS Layout on Expressways
Authors: Wang Jian Jun , Wu Qiong
Published: August 2013

In order to determine layout location of variable message signs (VMS) scientifically and reasonably and give full play to its transportation guidance effect, the optimal selection method of expressways VMS layout location is studied based on general rules and requirements of expressways network VMS layout. Construct the multi-objective optimization model of VMS information utilization maximum, VMS effectiveness and VMS total cost minimum based on fuzzy constraint conditions, and the Hang-Jin-Qu expressway VMS layout is analyzed. The results show that the proposed multi-objective optimization model is more in line with the actual need of VMS layout and easy to operate, and has important practical value.
Topology Characteristic of Hub-and-Spoke Transportation Network
Authors: Deng Ya Juan , Hu Shao Rong
Published: August 2013

As the hub-and-spoke network can achieve the balance of efficiency and cost, currently it is widely used in aviation, public and logistics transportation. The article chooses connectivity, node degree, entropy, and concentration indicator to analyze topology characteristic of hub-and-spoke transportation network; as well as structure reliability indicator considering sub-network numbers, shortest path and network dimension to research the reliability of hub-and-spoke network. The conclusion includes: hub-and-spoke network has higher connectivity, larger difference of node importance, higher order and less convenient; the ability to deal with random attacks is strong while the capability to resist deliberate attack is poor. The conclusion can improve planning and evaluation method of hub-and-spoke transportation network.