Chengshi guidao jiaotong yanjiu (Jun 2024)
Dynamic Response Simulation of the Pile-soil Composite Foundation and Adjacent Metro Tunnel under High-speed Train Load
Abstract
Objective As a typical vibration load, the vibration load caused by high-speed train running will induce dynamic response of the pile-soil foundation and the adjacent structures. It is necessary to study the characteristics of the dynamic response of the pile-soil composite foundation and the adjacent tunnel. Method Based on the project of Xi’an Metro Line 14 under-passing the grand bridge on Datong-Xian High-speed Railway, a combination of model test and numerical simulation is adopted, with the peak vibration acceleration, peak vibration speed and peak vibration displacement as dynamic response evaluation indexes, the dynamic response characteristics of the pile-soil composite foundation and the adjacent tunnel under train moving load are studied. Result & Conclusion The results show that when the train load is applied, the dynamic response index inside the foundation attenuates with the increase of the buried depth, but when there is a tunnel nearby, the dynamic response index value increases significantly, and its attenuation is obvious at the buried depth of the tunnel. As the distance from the center of the pile foundation increases, the dynamic response indexes of the foundation between piles and tunnels at the buried depth of the tunnel change from "wavy" distribution to monotone decreasing distribution. According to the control threshold of peak vibration speed, the horizontal area within the scope of 36m around the pile foundation center to the adjacent tunnel buried depth is the hazardous impact zone where the vibration reduction measures must be taken, and that within 36~114 m is the strong impact zone where taking vibration reduction measures is recommended, and that outside 114m is the weak impact zone, whether the vibration reduction measures are taken or not depends on the importance of the structure.
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