|
|
|
| Research on the Influence of Under - passing Shield Tunnel Construction on the Track Structures of High - speed Railway |
| CAI Xiao - pei1, CAI Xiang - hui2，TAN Shi - yu1, PENG Hua1, GUO Liang - wu1 |
| (1. Beijing Jiaotong University，Beijing 100044, China; 2. China Railway First Survey & Design Institute Group Co. Ltd, Xian, Shaanxi 710043 , China) |
|
|
|
|
Abstract Abstract ： Research purposes ： When the urban rail transit shield under - pass the high - speed railway, soil disturbance will cause track irregularity of the existing line, which puts impact on the safe operation of high - speed train. In the paper, taking the interaction between shield construction and the structures of the high - speed railway into consideration, the finite element model of the track - subgrade - soil was established to analyze the deformation features of the track under shield tunneling. In addition the effect of shield tunneling on the trains operation was discussed based on the dynamic model. Research conclusions:( 1 ) The track deformation will continue to increase with the shield tunneling, and gradually come to a standstill after excavation. The results show that vertical deformation of the track is obviously larger than the lateral deformation. (2) The track settlement deformation rate, settlement difference of two rails and lateral deformation of rail will reach the maximum value when the excavation face is located under the center line of railway track, and the value will gradually reduce after the center line of the track. (3) The track deformation will decrease linearly with tunnel depth, and increase linearly with tunnel radius. (4) When train passing through the affected area of shield tunnel, the wheel - rail force and safety indexes are significantly affected, and increase as the speed increases. (5) The vertical wheel - rail force and wheel unloading rate change more obviously when the excavation face is located under the center line of railway track. (6) The research conclusions have certain instructional significance to the evaluation and risk control of under - passing the existing railway projects.
|
|
Received: 03 August 2015
|
|
|
|
|
|
|
2016, Vol. 33 
