Analysis of dynamic stress intensity factor of rock mass 
under excavation unloading in underground caverns

WU Liang; ZHU Hong-bing; WANG Xiu-juan

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Analysis of dynamic stress intensity factor of rock mass under excavation unloading in underground caverns

更新时间：2026-06-25

- Analysis of dynamic stress intensity factor of rock mass under excavation unloading in underground caverns
- Vol. 27, Issue S1, (2006)
- 作者机构：
  
  武汉大学水资源与水电工程科学国家重点实验室,武汉,430072
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：15 December 2006，
  
  Published：2006
- 稿件说明：
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WU Liang, ZHU Hong-bing, WANG Xiu-juan. Analysis of dynamic stress intensity factor of rock mass under excavation unloading in underground caverns[J]. 2006, 27(S1).
DOI：

WU Liang, ZHU Hong-bing, WANG Xiu-juan. Analysis of dynamic stress intensity factor of rock mass under excavation unloading in underground caverns[J]. 2006, 27(S1). DOI：

摘要

在线弹性变形假设的情况下，以龙滩水电站地下厂房开挖为例和以ANSYS数值计算软件为平台，计算了在爆破荷载和初始地应力卸荷荷载作用下岩体裂纹的动态应力强度因子。计算表明，在中高地应力地区的爆破破岩过程中，虽然炮孔附近的裂纹扩展和岩体损伤主要由爆破荷载引起的，但岩体初始地应力的动态卸荷可能是引起保留岩体中远区松动及原有裂纹扩展的重要因素之一。

Abstract

Based on linear elastic assumption and ANSYS software

taking the excavation of underground powerhouse of Longtan Project for example

the dynamic stress intensity factor under blasting load and unloading of initial stress is calculated. The results show that the crack propagation and rock mass damage near borehole are due to blasting load in the process of fragmentizing rock by blasting in medium high ground stress region. But the dynamic unloading of initial stress is the key factor which induces the loose of reserved rock in medium long region and the propagation of original crack.

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