Investigation of characteristics of failure nearby deep tunnel considering unloading time

QIAN Yue-hong; LI Jie; CHEN Wen-tao; LI Wen-pei

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Investigation of characteristics of failure nearby deep tunnel considering unloading time

更新时间：2026-06-25

- Investigation of characteristics of failure nearby deep tunnel considering unloading time
- Vol. 32, Issue 5, (2011)
- 作者机构：
  
  1. 解放军理工大学工程兵工程学院,南京,210007
  2. 解放军92303部队，山东胶南,266405
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU32
- Online First：23 September 2011，
  
  Published：2011
- 稿件说明：
移动端阅览
QIAN Yue-hong, LI Jie, CHEN Wen-tao, et al. Investigation of characteristics of failure nearby deep tunnel considering unloading time[J]. 2011, 32(5).
DOI：

QIAN Yue-hong, LI Jie, CHEN Wen-tao, et al. Investigation of characteristics of failure nearby deep tunnel considering unloading time[J]. 2011, 32(5). DOI：

摘要

巷道开挖卸荷即巷道附近围岩应力重分布，卸荷速率影响应力场，开挖卸荷本质上是动力问题。根据弹性力学知识并假定卸荷过程符合时间参数的函数，基于Hamilton原理，获得考虑卸荷时间的巷道附近应力场演变规律。系统概括不同埋深条件下巷道附近应力场特征，并针对深埋巷道地应力较围岩强度大的特点，详细地分析考虑剪切及拉伸破坏时巷道附近破坏特征。结果表明，自巷道壁由近及远出现以剪切破坏、未破坏、拉伸破坏为主要特征的现象，也即以“剪切破坏+未破坏+拉伸破坏”为主要特征的状态是巷道附近可能破坏模式之一，并且该现象与围岩性质及卸荷时间相关。

Abstract

Unloading is the same with that of redistribution of surrounding rock’s stress when excavating; and the unloading velocity affects stress field

so the problem of unloading is a dynamic one essentially. Assumed the unloading ruled by a simple function characteristic of the time parameter and based on the elastic mechanics and the Hamilton principle

the regulation of the stress field nearby the tunnel is obtained. The stress fields around the carvity in different depths are generalized. Especially when the in-site stress is larger than the rock strength，the characteristics of the failure nearby the tunnel are analyzed considering the shear failure and tensile failure. The results show that the main mode of the shear failure

intact and tensile failure occurs from the tunnel. In other words

the characteristics of the shear failure

intact and tensile failure is one of the likely failure modes. The situation is concerned with the unloading time

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