Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress

LUO Yi; LU Wen-bo; ZHOU Chuang-bing; CHEN Ming; YAN Peng

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Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress

更新时间：2026-06-25

- Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress
- Vol. 32, Issue 5, (2011)
- 作者机构：
  
  1. 武汉大学水资源与水电工程科学国家重点实验室,武汉,430072
  2. 武汉大学水工岩石力学教育部重点实验室,武汉,430072
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU354
- Online First：23 September 2011，
  
  Published：2011
- 稿件说明：
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LUO Yi, LU Wen-bo, ZHOU Chuang-bing, et al. Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress[J]. 2011, 32(5).
DOI：

LUO Yi, LU Wen-bo, ZHOU Chuang-bing, et al. Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress[J]. 2011, 32(5). DOI：

摘要

分析了高地应力条件下地下厂房高边墙变形突变的形成机制，认为地应力动态卸荷引发的围岩松动是导致地下厂房高边墙变形突变的重要原因之一。基于瀑布沟地下厂房高边墙变形突变的实测资料，利用理论分析和数值模拟，计算了高地应力准静态和动态条件下地下厂房开挖卸荷引起的厂房高边墙的水平向位移。与实测资料对比表明，在动态卸荷过程中，结构面的张开和滑移是引起地下厂房围岩变形突变的主要原因，而在准静态卸载条件下，这种结构面张开变形却并不明显。在实际工程中应考虑开挖引起的地应力动态卸荷效应，尽量减小每次开挖对围岩扰动，谨防引起变形突变甚至失稳破坏

Abstract

The mechanism of abrupt large deformation in the sidewall of underground powerhouse is analyzed. The surrounding rock mass dynamic loosening is concerned as a main cause of abrupt deformation in underground powerhouse. Based on the monitored data at Pubugou hydropower station

numerical analysis is conducted with finite element method; and horizontal displacements induced by excavation load quasi-static and dynamic unloading are calculated respectively. The result itself and comparison to monitored data show that sliding and opening on structural surfaces induced by excavation load dynamic unloading are the major causes of abrupt large deformation in underground powerhouse

but which is not so obvious under quasi-static unloading. In actual projects

the transient effect of in-situ stress unloading should be considered; and the disturbance in the surrounding rock mass during each operation should be minimized to avoid potential abrupt large deformation

or even instability

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