Archive

14 August 2017, Volume 36 Issue 8 Previous Issue    Next Issue
---
Bridge & Tunnel Engineering
Highway & Railway Engineering
Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment
Traffic & Transportation Engineering
Vehicle &Electromechanical Engineering


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

Bridge & Tunnel Engineering

Select

Comparative Analysis on Multi-Lane Transverse Reduction Factor on Different Measured Circumstances DU Baisong1，LI Ming1，LUO Ling2 2017, 36(8): 1-5.  DOI: 10.3969/j.issn.1674-0696.2017.08.01 Abstract ( )   PDF (11509KB) ( )   Based on the measured traffic data of Guang-Shen-Zhu Expressway survey points in 7 days，the daily measured traffic data were taken as the research object to obtain the multi-lane transverse reduction factors，and the influence of the measured traffic data in different periods on the multi-lane transverse reduction factors was considered.Results show that the measured traffic loading data in different periods have little influence on the multi-lane transverse reduction factors.At the same time，according to the comparative analysis on the measured traffic data of survey points in Inner Mongolia，the influence of different regions on the multi- lane transverse reduction factors was researched.The results show that different regions have obvious influence on the transverse reduction factors for 1-5 lanes and almost no influence for more than five lanes. References | Related Articles | Metrics

Select

Temperature Effect of Cable-Stayed Bridge with Single Inclined Pylon with Different Side-Anchor Styles WANG Gaosi 2017, 36(8): 6-11.  DOI: 10.3969/j.issn.1674-0696.2017.08.02 Abstract ( )   PDF (11513KB) ( )   In order to explore the influence of different side-anchor forms on the temperature effect of single inclined pylon cable-stayed bridge，the earth-anchored and self-anchored single inclined pylon cable-stayed bridges were selected and studied by finite element method.The condition of the maximum cantilever during the construction and the effect of integral temperature，temperature gradient and temperature difference among the cable，beam and pylon at operation stage were analyzed.Research shows that：regardless of construction and operation stages，the temperature deformation of earth-anchored single inclined pylon cable-stayed bridge is bigger than that of self-anchored one.Different side-anchor styles have larger influence on the integral temperature stress and have no influence on the temperature gradient stress.The influence on temperature deformation at the maximum cantilever state is greater than that at operation stage，while the stress is on the contrary.At the operation stage，the girder stress caused by temperature difference among the cable，beam and pylon is larger than that at the maximum cantilever state. References | Related Articles | Metrics

Select

Disease Investigation and Cracking Mechanism for Shallow Buried Slab Culvert SUN Shuwei，SUN Yugui，ZHAO Fu，YAN Yatao 2017, 36(8): 17-22.  DOI: 10.3969/j.issn.1674-0696.2017.08.04 Abstract ( )   PDF (11389KB) ( )   With the increase of the train speed and the running of heavy-haul trains，the culvert diseases caused by train continuous impact become more prominent， such as cracks and settlement deformation.Taking Da-Zhun railway as the research object，its slab culvert diseases were investigated；and taking K47+669 as an typical example，the occurrence mechanism of the crack of slab culvert in Da-Zhun railway was studied by FLAC3D numerical simulation method.Research results show that：the main disease of slab culvert is the crack；the deformation of culvert under the action of self-weight stress is very little，the main inducement of cracks is the running train load and the maximum allowable load of the train is 102.1 kPa.The above research results can provide theoretical basis for the prevention and control of the slab culvert diseases of Da-Zhun railway；at the same time，the results can provide some guidance and references for the investigation and cracking mechanism analysis of culvert diseases in similar geological conditions at home and abroad. References | Related Articles | Metrics

Highway & Railway Engineering

Select

Adaptability of Pavement Typical Structure in High Altitude Cold Area MAO Xuesong，HUANG Zhe，ZHU Fengjie 2017, 36(8): 23-29.  DOI: 10.3969/j.issn.1674-0696.2017.08.05 Abstract ( )   PDF (11389KB) ( )   The pavement structure directly affects the road performance，and the high altitude and the low temperature climate are the key factors to affect the pavement structure.The existing pavement structure types of Tibet area were summarized through the investigation and analysis.K2876~K3595 section was selected as a typical section and its pavement disease types were analyzed.Based on the “Gong-Yu Highway” project，the field research on the test road was carried out by adopting four new types of pavement structures；and the temperature field simulation was also carried out.The results of the study show that：compared with the semi-rigid base pavement structures，the flexible base pavement structures have better adaptability in high altitude cold area，among which the pavement structure with the reinforced and graded crushed stone base performs best. References | Related Articles | Metrics

Select

Fuzzy Comprehensive Evaluation of Highway Drainage System Based on Monte-Carlo Simulation and Comprehensive Weight XU Guoyuan，SHAO Hengxin，WANG Dongming 2017, 36(8): 30-36.  DOI: 10.3969/j.issn.1674-0696.2017.08.06 Abstract ( )   PDF (11389KB) ( )   In order to comprehensively and accurately evaluate the existing highway drainage system，a set of evaluation indexes was established by analyzing the influence factors of the highway draining condition.Firstly，using fuzzy comprehension evaluation method，the score interval was given at the expert scoring stage， which was different from the previous specific score；secondly，Monte-Carlo simulation method was used to generate a random set of scores which was adapt with the given interval；thirdly，combining with the comprehensive weight of the influence factors of highway draining system determined by AHP and entropy weight method，the fuzzy comprehension evaluation on the drainage system was finished.On the basis of above，multiple iterations were carried out and the results of various fuzzy evaluations were summarized.Finally，the evaluation results were compared with those of the field test.It is proved that the proposed evaluation system is of some science and can provide a certain reference for the maintenance of highway drainage system. References | Related Articles | Metrics

Select

Mechanical Response of Pavement Structure of High-Performance RAP Material Flexible Base under the Condition of Overloading SONG Jinhua，ZHANG Xuesong，LIU Zhilei，JI Yuping，NI Dongxu 2017, 36(8): 37-43.  DOI: 10.3969/j.issn.1674-0696.2017.08.07 Abstract ( )   PDF (11389KB) ( )   Based on the reform and expansion project of 308 State Road from Nangong to Shixing，the mechanical response of pavement structure of high-performance RAP material flexible base under the condition of overloading was analyzed.The surface deflection，horizontal tension strain，the top compression strain of the remaining base layer of the old road and shearing stress of pavement structure of high-performance RAP material flexible base under five different load levels were comparatively analyzed by ABAQUS software，the distribution and the variation rule of them changing with load level were analyzed as well.The result shows that：the surface deflection distributes as a “W” in the X direction，and reaches its maximum value at the center of single wheel.With the gradual increase of depth，the surface layer is transformed into tensile strain from the pressure strain；and along with the increase of the axial load，the compression strain moves downward along the vertical direction；the top compression strain of the remaining base layer of the old road as a “U” in the X direction，and reaches its maximum value at the center of the wheel track；the shear stress shows a sine distribution in the transverse direction，reaches the maximum value at the edge of the wheel track and occurs in the range of 45cm depth below the surface of the surface layer in Y direction；under the same axle load，the mechanical response of pavement structure of high-performance RAP material flexible base is less than that of the graded crushed stone pavement structure.With the increase of axial load，both the mechanical responses of pavement structures increase，and the mechanical response of pavement structure of high-performance RAP material flexible base shows a slow increase. References | Related Articles | Metrics

Select

Influence of Aggregate Gradation on Compaction Characteristics of Warm Mix Rubber Asphalt Mixture ZHANG Lihong1，DONG Zejun2，GUO Shaocheng1 2017, 36(8): 44-48.  DOI: 10.3969/j.issn.1674-0696.2017.08.08 Abstract ( )   PDF (11389KB) ( )   In order to study the influence of aggregate gradation on compaction characteristics of warm mix rubber asphalt mixture，different aggregate gradation trend of AC-13，AC-20 and AC-25 warm mix rubber asphalt mixture was designed.Compaction characteristics of different aggregate gradation mixture were studied based on void ratio of Marshall specimen and gyratory compaction curve.The results show that fine gradation gives smaller void ratio of warm mix rubber asphalt mixture；the warm mix rubber asphalt mixture with design gradation has the best compactibility at the construction stage；the coarser gradation，the better high temperature stability of warm mix rubber asphalt pavement after traffic operation. References | Related Articles | Metrics

Select

Experimental Study on Dynamic Constitutive Relationship of Gravel Soil under Traffic Loading WANG Jing1，LIU Dapeng1，YANG Xiaohua2 2017, 36(8): 49-53.  DOI: 10.3969/j.issn.1674-0696.2017.08.09 Abstract ( )   PDF (11389KB) ( )   Gravel soil is a kind of commonly used subgrade filling in Xinjiang oasis-desert region，so it is necessary to study its dynamic constitutive relation under the traffic loading.Dynamic constitutive relationships of gravel soil under different conditions were studied through dynamic triaxial tests.It was found that dynamic constitutive relationship of gravel soil could be described by R.L.Kondner hyperbolic model，and then the model parameters under different conditions were obtained.The effect rules of water content，confining pressure，compaction degree，the initial static deviatoric stress and cyclic loading frequency on the dynamic constitutive relationship of gravel soil were studied based on the test results.The closer the relationship between moisture content and optimum moisture content，the greater the confining pressure，the higher the compaction degree, the dynamic constitutive relationship curve of gravel soil was closer to the stress axis.Dynamic constitutive relationship curve is relatively closer when the initial static deviatoric stress is 0 kPa and 10 kPa.It is also relatively closer when the dynamic load frequency is 1 Hz and 2 Hz.The study results have important reference value for the application of gravel soil subgrade in Xinjiang oasis-desert region. References | Related Articles | Metrics

Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment

Select

Energy Dissipation of Hydraulic Fracturing Based on Energy Balance ZHANG Zhimin，GAO Wenhua，MA Xiangqian 2017, 36(8): 54-57.  DOI: 10.3969/j.issn.1674-0696.2017.08.10 Abstract ( )   PDF (11384KB) ( )   In the exploration process of shale gas，the total energy dissipation of hydraulic fracturing is one of the significant indicators to evaluate whether it is worthy to be explored.The theoretical formula of the total energy consumption in the process of the hydraulic fracturing for the plane strain problem was deduced based on the principle of energy balance of Griffith，and the impact of crack development speed，water viscosity and crack shape on the whole energy consumption was analyzed.It was concluded that the brittle rocks tended to be more beneficial to the conservation of energy dissipation of hydraulic fracturing with the lower crack speed.Furthermore，the formula of energy dissipation per unit time with the equal water injection was obtained.With the growth of crack，the energy dissipation per unit time decreased gradually；accordingly，the power of the pressurized equipment mainly depended on the loading potential of the initial crack fracturing.The conclusion can be used for reference to evaluate and improve the hydraulic fracturing exploration of shale gas. References | Related Articles | Metrics

Select

Application of Small Scale Ship Model Technique in Optimization of Navigation Hub Design CAI Xinyong1，CAI Chuang2，LEI Penghua1 2017, 36(8): 58-62.  DOI: 10.3969/j.issn.1674-0696.2017.08.11 Abstract ( )   PDF (11394KB) ( )   Through the analysis on the principle and characteristics of small scale ship model technology，combined with the navigation flow conditions at the upper and lower reaches of the hub，the optimization of the layout of Dongguashan navigation junction and navigation structure in Fujiang River was studied.The results show that the navigation is on behalf of four stage flows.The maximum rudder angle of 500t fleet in upstream and downstream doesn’t exceed the safety rudder angle limit (25°) in ship model test，and the minimum navigation speed in upstream is better than the lowest safety speed (0.4 m/s) in ship model test.The navigation channel， entrance area and connecting section of the lock for the Dongguashan hub meet the navigation requirements of the four grade channel. References | Related Articles | Metrics

Select

Shore Power Supply System Adapt to Inland Waterway Boats LIU Zhenyu1，ZHU Siying2，MI Changjun2，HUANG Kun3，DONG Haitao2 2017, 36(8): 63-69.  DOI: 10.3969/j.issn.1674-0696.2017.08.12 Abstract ( )   PDF (11384KB) ( )   The problem of port pollution caused by ships which start ship engines to generate electricity during the berth time at port has attracted widespread attention.However，the current shore power technology mainly provides power for the ocean-going ships，which has nothing to do with inland waterway.The equipment composition，transmission mode of communication，power supply mode and some other aspects of shore power system for inland ships which locates at Xin’an river-way service center in Wuxi were elaborated.And the economic and social benefits of the system were analyzed，and the problems in the application and promotion process of the system were also discussed.The research shows that：the shore power system for inland ships，as a social public welfare service initiative，can provide safe and clean energy，improve the quality of boatmen’s daily life as well as improve the air quality of inland waterway，which is of great significance for the construction of green waterway. References | Related Articles | Metrics

Select

Formation Mechanism and Control Technology of Typical Perilous Rock in Three Gorges Reservoir Area XU Jiamei 2017, 36(8): 70-75.  DOI: 10.3969/j.issn.1674-0696.2017.08.13 Abstract ( )   PDF (11389KB) ( )   Perilous rock is a kind of common geological disaster with great harm，which is widely distributed in the Three Gorges Reservoir area.The basic features， the damage ways and the formation mechanism of typical perilous rock were studied.It was pointed out that there were three damage types，including falling type， sliding type and dumping type；and the chain reaction had influence on the damage modes of perilous rock.There was a great difference on the strength and weathering resistance between sandstone and mudstone (shale).The mudstone (shale) was easy to become a weak base because of its low strength，its easiness to be softened and weathered.Therefore，the mudstone (shale) became concave rock cavity because it was shattered and loosened；and the upper sandstone became perilous rock.The research shows that based on the correct analysis on the formation mechanism of perilous rock，the “artificial removing + point anchoring + suspended spray anchor + active protective net” technology is adopted to control the perilous rock in such areas，and the effect is obvious. References | Related Articles | Metrics

Traffic & Transportation Engineering

Select

Improvement of Urban Road Impedance Function Based on Section Impedance and Node Impedance PAN Yiyong，YU Ting，MA Jianxiao 2017, 36(8): 76-81.  DOI: 10.3969/j.issn.1674-0696.2017.08.14 Abstract ( )   PDF (11389KB) ( )   Road impedance is used to measure the accessibility of vehicles in urban traffic network，and is the basis of vehicle routing selection.The urban road impedance was divided into two parts：section impedance and node impedance.Section impedance was obtained by the optimization result of BPR function based on the relationship between traffic volume and traffic density；node impedance was obtained by adopting different models according to different road saturation at intersections.At the same time，the road impedance model was optimized by integrating into the influence factors of road impedance to make it more accurate.Finally， the improved road impedance function was verified by using the measured data of Nanjing Longpan road.The result shows that the optimized urban road impedance function can reflect the actual road impedance better. References | Related Articles | Metrics

Select

Residents’ Trip Characteristics of Intercity Traffic between Guangzhou and Foshan WEN Huiying，WU Yaping，ZHU Dianchen，QI Weiwei 2017, 36(8): 82-88.  DOI: 10.3969/j.issn.1674-0696.2017.08.15 Abstract ( )   PDF (11384KB) ( )   With acceleration of urbanization process，trip characteristics of urban agglomeration intercity traffic are constantly changing.The intercity traffic under the effect of Guangzhou and Foshan integration was taken as study object.Firstly，the influencing factors of residents’ trip behavior in Guangzhou and Foshan intercity traffic were analyzed.Then，through residents’ trip satisfaction survey of intercity traffic，trip characteristics were analyzed mainly from the number of residents’ weekly round trip，trip time，trip purpose and trip modes，adopting correlation analysis and regression analysis.Finally，some countermeasures and suggestions for integration development of Guangzhou and Foshan intercity traffic were put forward based on the SWOT analysis.Studying trip characteristics and integration development countermeasures can provide strong support for efficient allocation of traffic facilities and resources of Guangzhou and Foshan metropolitan，and can accelerate the regional integration process. References | Related Articles | Metrics

Select

Extraction Algorithm of Truck Brake Temperature from the Highway Lateral Thermal Image Temperature Spectrum MI Xiaoyi1，CHENG Haifan2，DONG Shuo1，ZHANG Tiejun1 2017, 36(8): 89-94.  DOI: 10.3969/j.issn.1674-0696.2017.08.16 Abstract ( )   PDF (11384KB) ( )   In order to develop one kind of infrared thermal image truck brake safety early warning system，which was used on the road side and aimed at improving the active safety of long and steep downgrade sections，an algorithm that the truck lateral thermal image was captured from the highway lateral thermal image temperature spectrum in order to further extract the truck brake temperature was proposed.High frequency thermograph was adopted to obtain the highway lateral thermal image temperature spectrum，and its potential characteristics were analyzed.According to these characteristics，the extraction algorithm of truck brake temperature was proposed by the matrix analytical method.The results from the algorithm software show that more than 98% of truck brake temperature can be extracted accurately under the state of free traffic flow，and these extraction results can be used as safety information in the infrared thermal image truck brake safety early warning system. References | Related Articles | Metrics

Select

Quantitative Classification Model for Standardization of Safety Production of Road Passenger Transport Enterprise Based on Matter-Element Theory CHEN Jian1，2，CHEN Lin2，WANG Daiyu2 2017, 36(8): 95-101.  DOI: 10.3969/j.issn.1674-0696.2017.08.17 Abstract ( )   PDF (11384KB) ( )   In order to solve the problem that the current safety production standardization evaluation of road passenger transport enterprise lacked of scientific quantitative classification method and the evaluation agencies mainly relied on the status of enterprises’ self-declaration of standard level to assess the enterprise，the road passenger transport enterprise safety production standardization classification evaluation index system was established，which was based on the relevant laws and regulations of the state safety production and the characteristics of road passenger transport enterprise safety production.Meanwhile，the quantitative classification model for safety production standardization of road passenger transport enterprises was constructed by use of matter-element theory.The model was applied to the case studies of 11 road passenger transport enterprises in Chongqing.The results show that，the safety production standardization level of 4 passenger transportation enterprises is second level；that of 3 passenger transportation enterprises is third level，and that of 4 enterprises is fourth level.The results are more comprehensive and objective，compared with the experts’ evaluation results，which shows that 6 passenger transportation enterprises is second level and 5 passenger transportation enterprises is third level.Therefore，the proposed matter-element model can actually reflect the comprehensive level of safety standardization of road passenger transport enterprise and determine the enterprise safety production standardization level according to the enterprise quantitative index. References | Related Articles | Metrics

Select

Simulation Optimization of Compound Channel Port Tugboat Configuration ZHENG Hongxing，XU Haidong，CAO Honglei 2017, 36(8): 102-109.  DOI: 10.3969/j.issn.1674-0696.2017.08.18 Abstract ( )   PDF (11384KB) ( )   In order to better guide the compound channel tugboat configuration，a tugboat operation simulation model was put forward.Firstly，based on the characteristics of compound channel，the Arena simulation model was proposed，which embedded operation scheduling optimization model，with the aim of minimizing the total tugboat fuel consumption cost.Secondly，the embedded heuristic rules genetic algorithm was designed to solve the proposed model.Thirdly，through various simulation tests，the present optimal configuration scheme was selected，considering total tugboat fuel cost and tugboat idle rate.Then，through the simulation analysis on the tugboat idle rate changing with ship types and ship numbers as well as the combination with large scale trend of ship in the future，the future optimal tugboat configuration scheme was given. References | Related Articles | Metrics

Vehicle &Electromechanical Engineering

Select

Analysis and Optimization of Car Interior Noise Based on Noise Transfer Function LU Senlin，REN Zhixiang 2017, 36(8): 110-114.  DOI: 10.3969/j.issn.1674-0696.2017.08.19 Abstract ( )   PDF (11390KB) ( )   A trimmed body finite element model and a coupled structure-acoustic model of a car were established by Hypermesh.Considering the excitation of engine，the analysis on NTF was conducted；and it was identified that the acoustic response caused by z direction excitation of engine rear suspension exceeded the target value.Through the analysis on the dynamic stiffness and acoustic contribution of connection points，the cause of the critical path noise problem was found.An optimization plan was proposed for the panels with large acoustic contribution and the local parts with no enough dynamic stiffness in excitation source.It is validated by simulation that the noise caused by z direction excitation of rear suspension is reduced and the car interior noise is also controlled. References | Related Articles | Metrics

Select

Numerical Simulation of Intake Ports of Engine Based on CFD LI Jun，LI Linfeng 2017, 36(8): 115-118.  DOI: 10.3969/j.issn.1674-0696.2017.08.20 Abstract ( )   PDF (11509KB) ( )   CFD (Computational Fluid Dynamics) was applied to numerical simulation of double intake ports of a certain type of engine，and the flow coefficient，swirl ratio and tumble ratio of vent valve under different lifts were obtained.Through comparing the calculation results with the test results，the data show good agreement and higher flow coefficient，and the variation rule of flow coefficient of airway under different lifts is summarized.Meanwhile，simulation results show that：the airway-in-cylinder has a good intake effect and obvious in-cylinder tumble flow，which further verifies the rationality of CFD simulation of the ports structure. References | Related Articles | Metrics