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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.

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 Corporation
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.

Wu W.,Guangzhou Railway Group Corporation
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.

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.

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