Blasting excavation induced damage characteristics of diversion tunnel for Jinping cascade II hydropower station

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

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Blasting excavation induced damage characteristics of diversion tunnel for Jinping cascade II hydropower station

更新时间：2026-06-25

- Blasting excavation induced damage characteristics of diversion tunnel for Jinping cascade II hydropower station
- Vol. 32, Issue S2, (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：26 August 2011，
  
  Published：2011
- 稿件说明：
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CHEN Ming, HU Ying-guo, LU Wen-bo, et al. Blasting excavation induced damage characteristics of diversion tunnel for Jinping cascade II hydropower station[J]. 2011, 32(S2).
DOI：

CHEN Ming, HU Ying-guo, LU Wen-bo, et al. Blasting excavation induced damage characteristics of diversion tunnel for Jinping cascade II hydropower station[J]. 2011, 32(S2). DOI：

摘要

爆破开挖导致的围岩损伤是围岩稳定性的重要影响因素。采用数值分析及现场检测的方法研究了锦屏二级引水隧洞岩体爆破开挖损伤特性。数值模拟结果表明，引水隧洞开挖引起的围岩应力重分布是围岩损伤的主要原因，爆炸荷载和应力重分布的耦合作用将增大引水隧洞围岩损伤区范围，增大的损伤深度可达1.5 m，考虑开挖荷载瞬态卸荷动态损伤效应的损伤区范围最大，较单独考虑围岩地应力准静态重分布所导致的损伤深度可增大1.9 m，平均损伤深度增大近1倍。现场检测成果较好地验证了数值模拟结果，表明爆破开挖可显著增大围岩的损伤范围。锦屏二级水电站引水隧洞开挖过程中，不可忽视爆炸荷载及开挖瞬态卸荷对围岩的损伤作用。

Abstract

The rock damage induced by blasting excavation is an important influence factor to rock stability. Blasting damage characteristics of the diversion tunnel in Jinping cascade II hydropower station were studied by numerical analysis and field testing. The results of numerical analysis show that the in-situ stress redistribution caused by diversion tunnel excavation is the main reason for rock damage

the coupling effect of blasting load and in-situ stress redistribution increased the rock damage zone about 1.2 meters; if the dynamic damage effects of transient unloading of excavation load is taken into account

the rock damage zone would increase by 1.9 meters compared with only considering in-situ stress redistribution; the average damage zone depth is about twice times than the damage zone induced by in-situ stress redistribution. Field test results verify the numerical analysis results well. It is shown that the blasting excavation can increase the rock damage zone significantly. In the process of Jinping cascade II hydropower diversion tunnel excavation

the damage effects of blasting load and transient unloading of excavation load should not be ignored

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CHEN Ming

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Related Institution

State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University

Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University

State Key Laboratory of Water Resources and Hydropower Engineering Sciences, Wuhan University

Guangdong Provincial Investigation, Design and Research Institute of Water Resources and Electric Power

Department of Mechanics and Engineering Sciences, Liaoning Technical University

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