列车动载作用下隧道底部隆起预应力锚索整治失效机制分析

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摘要以我国西南某铁路YD隧道典型底部隆起案例为依托，通过分析长达8年的现场监测数据，明确了预应力锚索处置后仍存在的隧底围岩变形难以约束、底部隆起病害持续发展的工程问题，进一步结合数值模拟手段，探究了列车振动荷载作用下缓倾层状岩体运营铁路隧道底部隆起预应力锚索整治的失效机制。研究结果表明：列车动载作用是导致YD隧道底部预应力锚索整治失效的关键因素；在列车动载作用下，预应力锚索出现了整体滑移现象，导致较大程度的预应力损失，难以有效约束隧底隆起发展，最终使锚索整治失效，可见在该病害整治中不宜采用预应力锚索进行加固；同时随列车速度增加，会进一步加剧预应力锚索整治失效现象，在同类病害整治后的逐级提速过程中应引起高度重视，铁路隧道底部隆起病害不宜采用预应力锚索整治方案。

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	相懋龙1
	阳军生1
	李林毅1
	傅金阳1
	2
	王立川1
	3
	李雨哲1

关键词 ：铁路隧道, 缓倾层状岩体, 底部隆起, 列车动载, 预应力锚索, 失效机制

Abstract：Based on the YD tunnel case in southwest China, the engineering problem of the continued development of the bottom heave disease after prestressing anchor cable remediation was clarified through the analysis of up to 8 years of field monitoring data, and further studied in conjunction with numerical simulations. The results show that: the train vibration load is the key factor leading to the failure of the prestressing anchor cable at the bottom of the YD tunnel; under the action of the dynamic train load, the prestressing anchor cable appears to slip as a whole, leading to a greater degree of prestressing loss, resulting in anchor cable failure; at the same time, with the increase in train speed, it will further aggravate the phenomenon of prestressing anchor cable remediation failure, which should be given high priority during the step-by-step speed increase after the remediation of similar diseases. It is not advisable to use prestressing anchor cable remediation solution for railway tunnel bottom heave.

Key words： railroad tunnel gently dipping stratified rock tunnel bottom heave train vibration load prestressed anchor cable failure mechanism

收稿日期: 2022-05-31 出版日期: 2023-08-15

引用本文:

相懋龙1，阳军生1，李林毅1，傅金阳1,2，王立川1,3，李雨哲1. 列车动载作用下隧道底部隆起预应力锚索整治失效机制分析[J]. 振动与冲击, 2023, 42(15): 190-198.
XIANG Maolong1, YANG Junsheng1, LI Linyi1, FU Jinyang1,2, WANG Lichuan1,3, LI Yuzhe1. Failure mechanism analysis of prestressed anchor cable treatment for tunnel bottom heave under train dynamic load. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(15): 190-198.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I15/190

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