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20 February 2018, Volume 37 Issue 02 Previous Issue    Next Issue
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Bridge & Tunnel Engineering
Highway & Railway Engineering
Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment
Traffic & Transportation Engineering
Vehicle &Electromechanical Engineering


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Bridge & Tunnel Engineering

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Sensitivity Analysis on Geometric Parameters of Ground Anchor-Box for Single-Oblique-Pylon Cable-Stayed Bridge ZHOU Shuixing，WANG Lin 2018, 37(02): 1-8.  DOI: 10.3969/j.issn.1674-0696.2018.02.01 Abstract ( )   PDF (751KB) ( )   On the basis of the ground anchor-box design of a single-oblique-pylon cable-stayed bridge in Guizhou，the numerical model was established by the finite element software Midas-FEA.Through three kinds of boundary trial calculation，the reasonable simulation method for the boundary condition of the ground anchor-box was obtained.The simplified model of structural mechanics was applied to the theoretical analysis，and the influence degree of geometric parameters on the stress of anchorage zone was researched.The results show that the sensitivity curves obtained by the simplified mechanics model are basically consistent with the numerical analysis results; the stress of roof in anchorage zone is the most sensitive to the roof thickness of the anchorage zone and the least sensitive to the thickness of the top plate in the compression zone. References | Related Articles | Metrics

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Experiment Study on Mechanical Parameters of Rock Foundation of Suspension Bridge TAO Qiyu1，LI Bailong2，WANG Zhonghao2，XING Xinfu2，XIAO Shiyan2 2018, 37(02): 9-14.  DOI: 10.3969/j.issn.1674-0696.2018.02.02 Abstract ( )   PDF (483KB) ( )   In order to study the mechanical properties of tunnel anchorage rock，the rock foundation of a suspension bridge—the altered adamellite was taken as an example to launch the indoor and in-situ tests，and the test values of its physical and mechanical parameters were obtained.According to the actual geological conditions in the field，the proposed values of the physical and mechanical parameters of the altered adamellite were given.The research results not only provide a basis for the stability analysis of the surrounding rock mass of the tunnel anchorage of a suspension bridge，but also provide a reference for the study of the mechanical properties of rock mass under similar engineering conditions. References | Related Articles | Metrics

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Diseases Causes and Countermeasures of Beam Transverse Crack of Pre-tensioning Prestressed Concrete Slab Beam YAN Yanhong1，DENG Ming1，2，HE Lizhong1，ZHAO Xiangying1 2018, 37(02): 15-23.  DOI: 10.3969/j.issn.1674-0696.2018.02.03 Abstract ( )   PDF (1502KB) ( )   The theoretical calculation and reinforcement test of the beam transverse crack of the pre-tensioning prestressed concrete slab beam were carried out，and the causes of the transverse crack at the beam end were analyzed.The pre-tensioning prestressed steel strand was self-anchored by batching concrete，which caused the local micro-cracks of concrete in the anchorage zone.During the operation，the diseases such as the beam bearing cavity and the hinge joints damage appeared，and caused the expansion of local micro-cracks and the transverse crack at the beam end under the action of overloading of live load.In the light of the beam transverse crack disease，adding local longitudinal reinforcement at the end of pre-tensioning beam during beam replacement or new construction was studied，and the control of micro-cracks in the structure and the shear bearing capacity of the beam end were obviously improved after the improvement.Aiming at the pre-tensioning prestressed concrete slab beam with transverse crack at the beam end during the operation，a single beam under replacement was used to carry out the theoretical analysis and load test of bonding steel plate reinforcement.In the case that the length of anchorage was satisfied，bonding steel plate reinforcement can deal with the transverse crack of the beam end better. References | Related Articles | Metrics

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Study on Definition Scope of Deep-Shallow-Buried Soil Tunnel SU Yubao 2018, 37(02): 24-28.  DOI: 10.3969/j.issn.1674-0696.2018.02.04 Abstract ( )   PDF (654KB) ( )   Three-dimensional numerical analysis on tunnel excavation was carried out by the finite element software ABAQUS.From the point of view of stress and strain，the definition scope of deep-shallow-buried soil tunnel was studied.The research results show that in the process of tunnel construction，the displacement value of the C point of the vault is the largest，and it has the trend of gradual increase with the increase of the depth of the burial.When the buried depth of the tunnel is increased to a certain critical state，the C point displacement of the vault does not change significantly with the increase of the depth of the burial，but tends to a fixed value.The stress release law of tunnel is the same as its vertical displacement rule.The vertical stress of the C point of the tunnel vault is increased with the increase of the tunnel burial depth，and the change curve of stress also tends to be gentle.The vertical stress of the C point has a good agreement with the calculation value of Terzaghi theory.Based on the above，the critical burial depth value for deep-shallow-buried tunnels was determined by means of theoretical analysis; and the proposed value was further verified by the current specification and Terzaghi theory. References | Related Articles | Metrics

Highway & Railway Engineering

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Fatigue Evolution Law of Asphalt under Constant Strain Based on DSR Time-Sweep ZHU Hongzhou1，2，FAN Shiping2，LU Zhangtian3 2018, 37(02): 29-34.  DOI: 10.3969/j.issn.1674-0696.2018.02.05 Abstract ( )   PDF (543KB) ( )   In order to research the fatigue evolution law of asphalt under constant strain，the Dynamic Shear Rheometer (DSR) was used to conduct the time-sweep test on 70# base asphalt and SBS modified asphalt in strain control model.The asphalt fatigue curve based on complex shear modulus (G*)，damage energy change rate (DR) and cumulative damaged energy ratio (DER) was obtained and the fatigue failure process was analyzed by the fatigue curve.The results show that the fatigue curve of 70# base asphalt has regularity，which can better characterize the fatigue failure process of asphalt and determine the fatigue life of asphalt.The dissipative energy change rate can not be used to represent the fatigue failure law of SBS modified asphalt.In addition，the fatigue life of SBS modified asphalt is better than that of 70 # asphalt with the same analysis method，and the fatigue life of both asphalt decreases with the increase of loading strain. References | Related Articles | Metrics

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Asphalt Mixture Fatigue Life Prediction Model Based on Neural Network XIE Chunlei1，3，ZHANG Yong1，3，GENG Hongbin2，3，WANG Xueying1 ，2，3 2018, 37(02): 35-40.  DOI: 10.3969/j.issn.1674-0696.2018.02.06 Abstract ( )   PDF (480KB) ( )   A neural network fatigue life prediction model with single hidden layer was established on MATLAB platform. The model took 3 indexes as the input term，such as the asphalt content，the void fraction and the strain level，and took the fatigue life as the output item.Four point bending fatigue test was carried out under different conditions，and a total of 27 sets of test data after normalization were obtained for training.After training，the goodness of fitness of the neural network fatigue life prediction model (R2) could reach 0.91.To make a comparsion，the same data was used to fit the traditional fatigue life regression equation.All the statistical indexes show that the prediction results of the neural network model are obviously superior to that of the fatigue equation model.Meanwhile，the neural network also has the function of the index weight analysis that the fatigue equation does not possess. References | Related Articles | Metrics

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Influence of Load Sequence and Load Amplitude on the Performance of Asphalt Mixture DING Biao1，ZHENG Chuanchao2，CHEN Tuanjie1，PENG Zixin3，ZOU Ling2 2018, 37(02): 41-46.  DOI: 10.3969/j.issn.1674-0696.2018.02.07 Abstract ( )   PDF (976KB) ( )   Based on the strain-controlled four-point bending fatigue test of asphalt mixture，the effect of load sequence and load amplitude on the dynamic viscoelastic parameters of asphalt mixture was analyzed.The results show that：under the control of low-high load sequence，the stiffness will decrease but the phase angel will increase in two load levels with the increase of load times; under the control of high-low load sequence，there are two cases of the change of the stiffness and the phase angle in the low load stage.When the low load level is close to the high one，the stiffness will decrease but the phase angle will increase with the increase of load times in the low load stage.When the difference of the amplitude of the high and low load is large，the stiffness in the low load stage will increase first and then decrease，while the phase angle in the low load stage will decrease first and then increase.The viscous modulus and elastic modulus of the fatigue test were calculated respectively by phase angle.In the process of high-low load sequence，the phenomenon that the stiffness in the low load stage increases first and then decreases while the phase angle in the low load stage decreases first and then increases is revealed，which is caused by the elastic recovery in the asphalt mixture. References | Related Articles | Metrics

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Dynamic Characteristics of Lime Modified Soil Subgrade Filling under Freezing-Thawing Cycles SONG Jinhua1，LI Bonan1，WANG Liang2，DU Jianfu2 2018, 37(02): 47-54.  DOI: 10.3969/j.issn.1674-0696.2018.02.08 Abstract ( )   PDF (598KB) ( )   The dynamic characteristics of lime modified soil under freezing and thawing cycles were studied by dynamic tri-axial compression，and the effect of dynamic stress amplitude，freeze-thaw cycles，cooling temperature and confining pressure on the cumulative plastic deformation of the soil was analyzed.The prediction model of cumulative plastic deformation was established under dynamic stress and freezing-thawing cycles.Based on the analysis of cumulative plastic deformation，the effect of the ratio of cement and the number of freezing and thawing cycles on the critical dynamic stress was further analyzed.And then the conclusion that the critical dynamic stress of the clean soil was less than 80 kPa and the critical dynamic stress of lime modified soil was between 150 kPa and 250 kPa was drawn.On the basis of the standard value of dynamic resilient modulus of subgrade MR in standard condition，the subgrade soil modulus reduction coefficient Kηunder the freezing-thawing cycle and the humidity adjustment coefficient of resilient modulus of subgrade KS were introduced.Therefore，the dynamic resilient modulus of subgrade was obtained under the influence of freezing-thawing cycle and subgrade soil moisture.The resilient modulus of lime modified soil on the top and bottom surfaces of subgrade work area was 70.18 MPa and 58.48 MPa respectively，which can meet the requirements of resilient modulus of subgrade. References | Related Articles | Metrics

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Application of Grey Verhulst Model Based on SA Algorithm in Settlement Prediction of Soft Soil Subgrade QIU Hongsheng1，ZHAO Yongqiang2，FU Shaoqing1，HU Yuhua1 2018, 37(02): 55-59.  DOI: 10.3969/j.issn.1674-0696.2018.02.09 Abstract ( )   PDF (750KB) ( )   Soft soil subgrade of highway will have large settlement after the completion of construction，and it may produce an impact on the vehicle traffic at the post stage.Therefore，the research on the prediction for soft soil subgrade settlement was carried out.According to the settlement data detected in practical engineering，a non-equidistance grey Verhulst model was established by using the scientific computing packages of python.Then the SA algorithm (simulated annealing algorithm) was applied to optimize the model，and the optimal solution of model parameters as well as final settlement was obtained.Meanwhile，the settlement prediction curve of subgrade changing with time was given.Comparative analysis and error analysis with the curve of conventional non-equidistance grey Verhulst model was carried out.The result shows that the model optimized with SA algorithm can better reflect the settlement regulation of soft soil subgrade，which can be applied to the settement prediction of soft soil subgrade. References | Related Articles | Metrics

Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment

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Characterization of Foundation Uniformity and Its Application to the Evaluation of Ground Uniformity in Dynamic Consolidation DENG Yongfeng1，ZHENG Xiaopei1，JIANG Shunwu2，LIU Huashan3，LI Pei1 2018, 37(02): 60-65.  DOI: 10.3969/j.issn.1674-0696.2018.02.10 Abstract ( )   PDF (480KB) ( )   The uniformity of the traditional foundation was evaluated by the uneven coefficient，but the method cannot reflect the specific distribution characteristics of the site parameters.According to this weakness，the comprehensive evaluation method combining the uneven coefficient and the variation coefficient was put forward on the basis of the traditional method.Combined with the dynamic compaction foundation treatment project at the first stage of Ganyu port area in Lianyungang，a series of in-situ testes were carried out to discuss the performance and reliability of the proposed method in the foundation uniformity evaluation.The results show that the proposed method can not only synthetically evaluate the uniformity of the foundation，but also can systematically evaluate the foundation from the plane and the depth range. References | Related Articles | Metrics

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Technology Research and Development of New Type of Large Area Sand-Quilt-Cushion for Newly Hydraulic Reclamation Mud Foundation YANG Fuling1，DONG Zhiliang2，BAO Shufeng3，4，LIN Junhua3，4，XIE Rongxin3，4 2018, 37(02): 66-75.  DOI: 10.3969/j.issn.1674-0696.2018.02.11 Abstract ( )   PDF (1012KB) ( )   The newly hydraulic reclamation mud foundation can be treated as a working platform for the construction machinery of subsequent foundation treatment after rapid reinforcement of shallow surface.However，the construction period was short but the construction cost was not low.Therefore，a new idea of newly large area sand-quilt-cushion was put forward，and the bearing mechanism of this kind of cushion foundation was qualitatively analyzed.Based on the actual project，the field comparative test research was carried out.The research results show that：① The new type of large area sand-quilt-cushion is a large spatial and 3D permeable structure; combined with underlying floating (flow) mud foundation，it can form a whole bearing system with high bearing capacity.Its working mechanism is mainly reflected in the shell effect (including the stress diffusion effect and the surface closure effect)，the lateral confinement effect，the drainage consolidation effect and the vertical reinforcement effect (only floating mud foundation).② The new type of large area sand-quit-cushion (the scheme 5) has good integrity and better sealing effect，which can effectively reduce the extent of uplift surrounding foundation during construction process.Therefore，it can be used as a one-time vacuum preloading platform for the newly hydraulic reclamation mud foundation. References | Related Articles | Metrics

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Geo-temperature Change Law Caused by Shallow Geothermal Energy Utilization in Chongqing ZHANG Furen1，WANG Lexiang1，LI Xueyang1，PENG Qingyuan2，WANG Cece2 2018, 37(02): 76-81.  DOI: 10.3969/j.issn.1674-0696.2018.02.12 Abstract ( )   PDF (790KB) ( )   The resource monitoring network of shallow geothermal energy based on the investigation and related research work of shallow geothermal energy in Chongqing in recent years and combined with the constructed project of the shallow geothermal in development and utilization was established to conduct dynamic monitoring of ground-source heat pump system.The ground temperature was cyclical change along with the operation of the system，and the change range of the ground temperature for the operation hole was significantly higher than that of drilling holes along the edges，through gathering temperature data of typical ground-source heat pump project from March 28th, 2011 to October 28th, 2014 and the comparative analysis of ground temperature variation before and after the operation of system.The average temperature change curve of the recovery period after the operation of the system was drawn，and it was discovered that there was upward trend in the average temperature of soil and slight heat accumulation.At present，the system is running in a good condition and the ground temperature does not have a significant impact on the system. References | Related Articles | Metrics

Traffic & Transportation Engineering

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Influencing Factors of Driver Vigilance Based on Simulation Experiment XIONG Jian1，YUAN Lingwei1，XIONG Deng2 2018, 37(02): 82-89.  DOI: 10.3969/j.issn.1674-0696.2018.02.13 Abstract ( )   PDF (766KB) ( )   In order to test the influencing factors of drivers’ vigilance，the testing scenario of city road and highway based on driving simulation system was designed，which respectively took drivers as the subject and took the traffic signal lamp and the quantity of risk information as the influencing factors of vigilance.The drivers’ braking response time and fixation behavior data in face of risk in 4 scenarios were selected as the evaluation parameters of the simulation test of drivers’ vigilance.The difference of drivers’ vigilance level under different scene factors was analyzed.The results show that the designed simulation experiment and test results are good.Under different traffic control conditions and different risk information，there are certain differences between drivers’ vigilance level.The research results can be used to analyze the causes of road traffic accidents. References | Related Articles | Metrics

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Modeling of Park & Ride Behaviors of Commuting Corridors Based on Structural Equation Model XIANG Hongyan，HE Suzhen，XU Tao 2018, 37(02): 90-95.  DOI: 10.3969/j.issn.1674-0696.2018.02.14 Abstract ( )   PDF (479KB) ( )   The park-and-ride mode of commuter corridor based on rail transit is an effective means to improve the corridor travel rate ，alleviate the urban traffic congestion and solve the insufficiency of parking facilities.Based on structural equation model (SEM)， the personal attributes，the information demand preference and the park-and-ride facilities level were taken as exogenous latent variables; the travel purpose，the departure time，the travel mode and the travel intensity were taken as endogenous latent variable; the P&R travel behavior path and the effectiveness of various factors were analyzed.Based on the actual survey data，LISREL software was used to evaluate the effect of the model.The analysis results show that：①The travel mode of P&R has strong regularity in time， and travelers have a higher percentage of choosing P&R travel mode on morning and evening peak hours.②Traffic state information， accident information，parking information have significant effect on P&R travel behavior.Among them，the traffic state utility value is 0.8; in the aspect of endogenous latent variables，the travel purpose has the highest priority，which has greater impact on the departure time，travel mode and travel intensity. References | Related Articles | Metrics

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Self-organizing Control Method for Urban Traffic Signal Based on the Pass-Priority Rules WANG Anlin，SUN Xiaolong，ZHONG Fusheng 2018, 37(02): 96-101.  DOI: 10.3969/j.issn.1674-0696.2018.02.15 Abstract ( )   PDF (561KB) ( )   Traditional traffic signal control methods lacked the flexibility on phase and phase sequence，and their traffic efficiency and control of real-time was poor.To solve these problems，a self-organizing control method for urban traffic signal based on the pass-priority rules was proposed.In the self-organizing control system for urban traffic signal，the average delay time，the average speed and the parking rate were taken as evaluation indices，and the pass-priority rules (including pass-priority，intersections relation and phase combination) were taken as fundamental basis of the real-time control on phase and phase sequence.Therefore，a microscopic city traffic model based on cellular automata (CA) was established，which efficiently realized the self-organizing control of traffic signal.The traffic control simulation of 16 intersections under the same condition shows that：comprising with traditional fixed-time control and inductive control methods，the self-organizing control method for urban traffic signal based on the pass- priority rules has higher traffic efficiency and better real-time control effect.The proposed method based on the pass-priority rules is a theoretical exploration to the self-organizing control for urban traffic signal，and it has a guidance meaning to the engineering of the new generation of intelligent traffic control equipment and system. References | Related Articles | Metrics

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Satisfaction Model of Cyclists in Urban Road Environment ZHU Tong1，YANG Chenxuan1，GUO Chunlin1，LI Congying2 2018, 37(02): 102-106.  DOI: 10.3969/j.issn.1674-0696.2018.02.16 Abstract ( )   PDF (380KB) ( )   In order to establish the numerical relationship between urban road environment factors and satisfaction degree of urban bike travelers，23 indicators were selected for the commuter traffic，and the questionnaire was designed and investigated.The reliability and validity of questionnaire was tested and the content of the questionnaire was determined by the preliminary survey data.The video surveys and laboratory questionnaire were adopted in formal investigation.The results show that there is no significant difference between the results of the survey and on-the-spot investigation.The model of urban road cyclists’ satisfaction was finally obtained by model test and correction.The influence coefficient of model shows that the total influence coefficient of patency of road and environmental comfort are 0.632 and 0.601 respectively; the influence coefficient of road construction level is 0.478 and the influence coefficient of traffic safety feeling is 0.401.The electric vehicle influences cyclists’ patency and security most，and its influence coefficient reaches to 0.894 and 0.781 respectively.The effect of isolation facilities on security is only 0.117.The results show that the main external factors that influence the cyclists’ satisfaction are the patency of road and the environmental comfort， and the effects of road construction level on satisfaction have great limitations.Electric vehicles have much influence on cyclists. Cyclists think that isolation facilities do not have obvious safety protection.The above conclusions can provide a basis for the improvement of urban bicycle traffic environment. References | Related Articles | Metrics

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Traffic Location Level of the Cities in Wuhan City Circle MA Caixue，LI Xiantao，ZHAO Lili，ZHAO Yunyi 2018, 37(02): 107-112.  DOI: 10.3969/j.issn.1674-0696.2018.02.17 Abstract ( )   PDF (503KB) ( )   As the representative power of the central region，Wuhan city circle has established its economic position in the whole country with its unique traffic location advantage.From the road traffic accessibility and potential，the traffic location level of each city in Wuhan city circle was studied.The distance measurement method was used to measure the urban traffic accessibility，and the potential model was introduced to evaluate the city’s location potential.On this basis，the comprehensive traffic location level of each city in Wuhan city circle was obtained by weighting.The results show that：① the comprehensive traffic location of Wuhan， Ezhou and Xiantao is relatively high，and the location advantage is stronger; ② Huanggang，Huangshi and Tianmen are followed closely ，and the advantages of traffic location are relatively weak; ③ the traffic location in Xiaogan，Xianning and Qianjiang is lower than that of the above cities. References | Related Articles | Metrics

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Layout Optimization Method of Intelligent Monitoring Data Collector of Expressway LI Xia1，WU Weiwei1，CUI Hongjun1，LI Shaopeng2，LI Hainan1 2018, 37(02): 113-118.  DOI: 10.3969/j.issn.1674-0696.2018.02.18 Abstract ( )   PDF (471KB) ( )   The intelligent monitoring data collector of highway is always laid out according to the experience，which is easy to cause the omission，deviation of monitoring area or the waste of the quantity cost of the collector.In view of the present situation，based on the principle of camera imaging and the pixel requirements of the monitoring identification，the whole course monitoring model under the horizontal curve section，the longitudinal curve section as well as the horizontal and longitudinal combination curve section of the highway was established respectively，with the combination of the linear characteristic parameters of the road.And the calculation formulas of the spacing，horizontal angle and dip angle of the data collector under 3 different alignments were deduced.The optimal layout of data collector was made on an actual highway.Comprised with the layout based on experience，the results show that the proposed layout optimization method of data collector can not only ensure the effectiveness of the whole course monitoring of highway，but also save the quantity cost of the collector. References | Related Articles | Metrics

Vehicle &Electromechanical Engineering

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Review of Research on Electro-Hydraulic Power Steering Technology XIE Houxun1，GAO Xiang2 2018, 37(02): 119-122.  DOI: 10.3969/j.issn.1674-0696.2018.02.19 Abstract ( )   PDF (376KB) ( )   In order to analyze the current shortcomings and further research directions of electro-hydraulic power steering (EHPS) design，the research process，characteristics and current situation of EHPS technology at home and abroad were reviewed.The foreign research mainly focused on the introduction and analysis of energy saving control strategy and system development process etc..The domestic research focused on the system modeling and simulation，the analysis of different power characteristics and the control strategy of the drive motor，etc.，however，its research on the design theory of power characteristics，the dynamic performance of the system and the design method of the main parameters was insufficient，and its guidance to the design was not enough.It is expounded that how to quantify driver’s road sense，analyze the characteristics of electric pump and optimize the design method of multiple objective parameters are the problems which are needed to be studied further in the research and engineering application of EHPS. References | Related Articles | Metrics

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Temperature Compensation Technology for Induction Motor Vector Control System MEI Jianwei，TIAN Yanfang，LUO Min，LIU Jie，WEI Haibo 2018, 37(02): 123-128.  DOI: 10.3969/j.issn.1674-0696.2018.02.20 Abstract ( )   PDF (538KB) ( )   Being frequently used as an fixed rotor time constant in the calculation of induction motor rotor field oriented vector control system，the rotor time constant was practically sensitive to the temperature and magnetic saturation effects，which drifted from its initial value，thereby causing the failure of field orientation.The influence of the rotor time constant on the stator current excitation component，torque component，rotor flux and electromagnetic torque was analyzed theoretically，and a rotor time constant temperature compensation method was proposed，which used the temperature changes of stator winding to correct rotor time compensation values.Simulation test results show that the proposed method is effective and feasible，which has a certain practical significance. References | Related Articles | Metrics