Zhang Y.,Southwest Jiaotong University |
Zou B.,Guangzhou Railway Group Corporation |
Guo J.,Southwest Jiaotong University |
Zha Z.,Southwest Jiaotong University
Zhongguo Tiedao Kexue/China Railway Science | Year: 2012
To solve the risk ranking problem for the hazard events of the same risk level in train control system, the risk evaluation index system was established from two aspects of hazard event, namely, occurrence frequency and sequence severity. The weight for each risk evaluation index was determined using fuzzy analytic hierarchy process method based on the evaluation results given by experts. Then the risk ranking model for the hazards of the same level in train control system was established based on the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS method). With the model, risk ranking was carried through for three hazard events of the same risk level which were identified by CTCS-2 level train control system of a certain high-speed railway during the construction period in China. Accordingly, the rationality, feasibility and the applicability of the model are verified. Using the model, more pivotal hazard events can be separated from the hazard events of the same risk level, and scientific references can be provided for risk control and supervision.
Ren J.,Southwest Jiaotong University |
Zhao H.,Southwest Jiaotong University |
Ouyang M.,Guangzhou Railway Group Company
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2016
According to the track irregularity quality index by track inspection car of the grinded Wuhan-Guangzhou high-speed rail, the actual wheel-rail profile after grinding was simulated using finite element method in order to study the effect of rail grinding on wheel-rail contact condition. The calculation results show that wheel-rail contact points move to the rail surface center after grinding, a 20~30 mm contact band occurs at the top of rail after grinding. Slight widening of contact band and double-point contact arises when the passing gross weight is about 3.979 ×107 t, 13 months later after the grinding. Contact band width increases significantly up to 35 mm when the passing gross weight is about 5.203 ×107 t, 17 months later after the grinding, The alarm parameters of the lateral acceleration of track inspection car at Zhuzhou and Guanzhou high-speed track division indicate that rail grinding can effectively reduce the lateral acceleration alarms of the trains. To some extent, the change of power supply in Changsha power supply station indicates that rail grinding can effectively reduce the power consumption of the trains. © 2016, Huazhong University of Science and Technology. All right reserved.
Yuan D.,Southwest Jiaotong University |
Yan H.,Guangzhou Railway Group Company |
Kuang W.,Guangzhou Railway Group Company
ICTE 2015 - Proceedings of the 5th International Conference on Transportation Engineering | Year: 2015
Passenger transfer volume size determines the construction scale and transfer mode of urban comprehensive hub. From the factors which influence passengers to transfer to analysis the transfer requirements of large-scale comprehensive passenger transport hub, the main factors influencing the passenger transfer mode selection characteristics can be summarized as traffic modes, the traveler characteristics and travel characteristics from three aspects. This paper compares the traditional urban comprehensive passenger transport hub with a new mode of urban comprehensive passenger transport hub in transfer type, concluded the transfer mode of comprehensive passenger transport hub and function are more diverse. The transfer between the internal and external transportation hub is actually the choice of transportation problem, it's the key point of hub transfer volume prediction. This paper considers the transfer influence factors of different people and present a simple prediction function. © ASCE.
Shi Y.-F.,East China Jiaotong University |
Cai L.-P.,Guangzhou Railway Group Corporation |
Yang J.-S.,Central South University |
Hu W.-T.,East China Jiaotong University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015
The horizontal jet-grouting pile, which is applicable in soil reinforcement and water isolation, is hard to assemble an ideal homogeneous sealed pre-reinforced shell accounting for the restriction of geological condition, material characters and construction technology. For improvement, a composite pre-reinforcement technique utilizing horizontal jet-grouting piles and large pipe shed is proposed. The corresponding 3-D numerical model considering fluid-solid coupling effects is established using FLAC3D for further analysis. The results show that the range of the plastic zone decreases by adding extra pipe shed beneath the piles. The " arch support effect" of piles in horizontal direction and " beam support effect" of shed in vertical direction can be fulfilled. With this technique, the value of the stretch stress of the horizontal rotary jet-grouting piles will be reduced, which results in better stability and reinforcement effect of piles. This technique is successful applied in the water-rich section of Jiangmen tunnel in Guangzhou-Zhuhai Railway, which may provide suggestions for similar projects. ©, 2015, Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering. All right reserved.
Cui P.-L.,Beijing Jiaotong University |
Wang H.-F.,Beijing Jiaotong University |
Chen J.-Y.,Guangzhou Railway Group Corporation |
Xu T.-H.,Beijing Jiaotong University
Tiedao Xuebao/Journal of the China Railway Society | Year: 2015
At the current stage, the unavailability of quantitative analysis method for the complexity of train control system results in difficulty to control safety key aspects in the application process, and lack of theoretical criteria for system optimization. Based on information entropy theory, the complexity quantitative analysis method of train control system was proposed in this article. The system complexity was measured from three aspects of structure, functional allocation and process control logic, and the measurement formula was provided. The orthogonal projection method was used to build the multi-dimensional measurement model for structural complexity metrics of train control system. In the case of Wuhan-Guangzhou railway line, for the same railway line, analysis was made on the structural complexity, functional allocation complexity, and process control logic complexity under different system configurations. The research provides significance for reference in the improvement of the safety control ability in the operation process of train control system, and in the further optimization of the system structure. ©, 2015, Science Press. All right reserved.
Tian M.,Lanzhou Jiaotong University |
Li J.,Lanzhou Jiaotong University |
Shi P.,Guangzhou Railway Group Corporation |
Guo Y.,Lanzhou Jiaotong University
IEEE Transactions on Applied Superconductivity | Year: 2016
Though the magnetic-valve controllable reactor (MCR) has been actually applied in dynamic reactive compensation of electric railway and power system, its dynamic compensation performance is limited by the defect of its slow response in the transition process. Based on the structure characteristics and the magnetic flux distribution of an MCR, a novel quickness improvement method, which only needs to add auxiliary windings in two iron yokes of an MCR and several switch devices, is proposed. The mathematical model of the magnetization and demagnetization with this quickness improvement method is analyzed and built, based on which, the relationships between the estimated transition time and the parameters of the improved MCR structure are considered. Also, the simulation model of the quickness improvement method is established by MATLAB/SIMPOWERSYSTEM. The simulation results confirm correctness of the theoretical analysis and effectiveness of the novel quickness improvement method of an MCR presented here. © 2016 IEEE.
Wu W.,Guangzhou Railway Group Company
Zhongguo Tiedao Kexue/China Railway Science | Year: 2011
According to the problem of the distribution rate of passenger flow in railway transportation corridor with both high-speed railway and the existing line, the main factors influencing passengers' choice behavior between high-speed railway and the existing railway were analyzed. Based on considering economy, rapidity, convenience and comfort, a variable weight generalized cost function was set up by addition principle. Then the generalized cost function was used to replace the utility function of Logit model, a variable weight Logit model for the assignment of passenger was accordingly established. The model was used to assign the passenger flow of Wuhan-Guangzhou Railway transportation corridor. The comparative analysis of the calculation results and the actual statistical data of passenger flow indicates that the proposed model has high accuracy. The key factors which influence the development of Wuhan-Guangzhou Railway transportation corridor were analyzed. Finally, the three-stage developing strategies including cultivation period, growth period and maturity period were provided for the passenger transportation organization of Wuhan-Guangzhou high-speed railway.
Huang N.-Q.,Guangzhou Railway Group Corporation
Applied Mechanics and Materials | Year: 2013
Based on the construction of the New Yangshi Tunnel, a section of the electrified speed-up reconstruction project in Zhe-Gan Railway, the author discusses and studies the construction technology employing annular excavation with core soil reserved method, together with the use of H175 steel frame as initial support in the shallow-buried and long-span railway tunnel in soft rock. Through the technical and economic comparison, it shows that the present method is faster, with the construction progress of 50m per month in average, and is more economical in construction than Center Diaphragm (CD) method with an investment of 4,000,000 Yuan having been saved. © (2013) Trans Tech Publications, Switzerland.
Xu L.,Guangdong Polytechnic Normal University |
Wu Q.,Guangdong Polytechnic Normal University |
Mao Y.,Guangzhou Railway Group Corporation
Key Engineering Materials | Year: 2014
Electric heating cutting technology is that material is heated by the thermal effect of the current so that the cutting zone material is softened, meanwhile this reduces the shear resistance of the material, thereby the cutting process gets smooth. In order to make the electric heating technology apply to the small hole drilling successfully, this paper designs a set of compact and simple electric heating drilling device to small hole, this device adopts the electrode structure to avoid spark, and by the device we drill small hole to hard-to-cut materials stainless steel under various parameter conditions, test process and results show that the electric heating drilling device is effective and practical.
Shi Y.-F.,Central South University |
Yang J.-S.,Central South University |
Shao H.-P.,Guangzhou Railway Group Corporation |
Long Y.,Guangzhou Railway Group Corporation |
Yang F.,Central South University
Yantu Lixue/Rock and Soil Mechanics | Year: 2012
Based on the fact that Jiangmen Tunnel of Guangzhou-Zhuhai Railway under water-rich channel has characters of super-shallow, large cross-section and water-rich, this paper aims to propose a systematic analysis of the risks of the super-shallow tunnel with large cross-section under water-rich channel and to elaborate reasons for these risks and their potential detriments. After the initial comparison of possible pre-reinforcement means and excavation schemes, a quantitative comparison and selection is further conducted by using three-dimensional numerical simulation approach. It suggests that with the precondition of taking surface water-resisting measures, the excavation scheme in the combination of horizontal jet-grouting and large pipe roof advanced support and 3-bench method should be applied. As is suggested in the research, this scheme is not only effective to waterproof and reinforcing the stratum, but also has its advantages to eliminate the risks of collapse, accelerate the construction progress and reduce the cost at the same time on the prerequisite of ensuring the safety of tunnel construction, so as to provide some references for other similar projects.