Numerical simulation of blasting excavation induced damage to deep tunnel

CHEN Ming; HU Ying-guo; LU Wen-bo; YAN Peng; ZHOU Chuang-bing

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Numerical simulation of blasting excavation induced damage to deep tunnel

更新时间：2026-06-25

- Numerical simulation of blasting excavation induced damage to deep tunnel
- 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试验室,武汉,430072
  2. 武汉大学水工岩石力学教育部重点试验室,武汉,430072
- 作者简介：
- 基金信息：
- DOI：
  CLC： O383.1
- Online First：23 September 2011，
  
  Published：2011
- 稿件说明：
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CHEN Ming, HU Ying-guo, LU Wen-bo, et al. Numerical simulation of blasting excavation induced damage to deep tunnel[J]. 2011, 32(5).
DOI：

CHEN Ming, HU Ying-guo, LU Wen-bo, et al. Numerical simulation of blasting excavation induced damage to deep tunnel[J]. 2011, 32(5). DOI：

摘要

爆破开挖扰动是深埋隧洞损伤区孕育及演化的重要影响因素。根据隧洞岩体钻爆开挖过程分析了爆炸荷载及开挖荷载瞬态卸荷对岩体的扰动作用，基于LS-DYNA动力有限元程序，提出了利用施加节点反力模拟待开挖隧洞岩体的约束作用，通过控制节点反力的变化过程以模拟开挖荷载瞬态卸荷，采用爆炸荷载变化曲线模拟爆炸作用过程的爆破开挖扰动数值模拟方法，并利用该方法模拟分析了爆破开挖扰动对围岩的损伤效应，结果表明，应力重分布对围岩损伤最大，隧洞围岩损伤区主要由围岩初始应力重分布所导致，爆炸荷载作用将增大围岩损伤区范围，考虑开挖荷载瞬态卸荷作用的围岩损伤区最大，且地应力越高，开挖荷载瞬态卸荷作用对围岩的损伤效应越显著

Abstract

Blasting excavation disturbance is an important influence factor to the inoculation and evolution of deep tunnel damaged zone. According to the drilling and blasting excavation process of the tunnel

the disturbance effects induced by blast load and transient unloading of excavation load are analyzed; and based on the LS-DYNA dynamic finite element program

the numerical simulation method of blasting excavation disturbance is proposed that using nodes reaction to simulate the constraint of the awaiting excavation tunnel rock

controlling the change process of nodes reaction to simulate transient unloading of excavation load

and using blasting loading change curve to simulate the effect of explosion. After that

the blasting excavation induced damage of tunnel rock mass is analyzed by the method. The results show that the surrounding rock damage zone is mainly caused by the in-situ stress redistribution and increased by blasting load; the surrounding rock damage zone is maximum when the transient unloading of excavation load is taken into account; and in-situ stress is higher

the damage caused by transient unloading of excavation load is more remarkable

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