高铁列车荷载作用下桩-土复合地基及近接地铁隧道的动力响应模拟研究
李团社
Dynamic Response Simulation of the Pile-soil Composite Foundation and Adjacent Metro Tunnel under High-speed Train Load
LI Tuanshe
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作者信息:中铁第一勘察设计院集团有限公司，710043，西安
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Affiliation:China Railway First Survey and Design Institute Group Co., Ltd.,710043, Xi’an, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.06.019
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中图分类号/CLCN:TU435
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栏目/Col:研究报告
摘要:
［目的］作为典型的振动荷载，高铁列车运行引起的振动荷载会诱发桩-土地基及附近结构产生动力响应，有必要对桩-土复合地基及近接隧道的动力响应特性进行研究。［方法］基于西安地铁14号线下穿大西高速铁路特大桥工程，采用模型试验和数值模拟相结合的方法，以峰值振动加速度、峰值振动速度和峰值振动位移作为动力响应评价指标，研究了列车移动荷载作用下桩-土复合地基及近接隧道的动力响应特性。［结果及结论］研究结果表明，当施加列车荷载时，地基内部的动力响应指标均随着埋深的增加而衰减，但存在近接隧道时，动力响应指标值显著增加，且在隧道埋深处衰减明显。随着距桩基中心距离的增加，隧道埋深处的桩-隧之间地基的各动力响应指标从“波浪形”分布变为单调递减分布。根据峰值振动速度的控制阈值，近接隧道埋深处距桩基础中心水平3.6m范围内的地基处于危险影响区，必须采用减振措施；3.6~11.4m范围内的地基处于强影响区，建议采取减振措施；11.4m以外的地基处于弱影响区，视结构的重要性决定是否需要采取减振措施。
Abstracts:
［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 3.6m 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 3.6 ~ 11.4 m is the strong impact zone where taking vibration reduction measures is recommended, and that outside 11.4m 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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