Detection and analysis of excavation damage zone of deep tunnel

LIU Ning; ZHANG Chun-sheng; CHU Wei-jiang

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Detection and analysis of excavation damage zone of deep tunnel

更新时间：2026-06-25

- Detection and analysis of excavation damage zone of deep tunnel
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  中国水电顾问集团华东勘测设计研究院,杭州,310014
- 作者简介：
- 基金信息：
- DOI：
  CLC： U456
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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LIU Ning, ZHANG Chun-sheng, CHU Wei-jiang. Detection and analysis of excavation damage zone of deep tunnel[J]. 2011, 32(S2).
DOI：

LIU Ning, ZHANG Chun-sheng, CHU Wei-jiang. Detection and analysis of excavation damage zone of deep tunnel[J]. 2011, 32(S2). DOI：

摘要

隧洞开挖以后围岩会出现损伤，并在洞周形成开挖损伤区，在损伤区范围内声波波速会出现衰减。针对锦屏二级水电站3#引水隧洞在隧道掘进机（TBM）开挖过程中可能形成的损伤区，首先利用数值方法探讨了损伤区的分布特征，通过监测特征点在开挖过程中的应力路径，确定了特征点的应力状态和可能出现声波波速衰减的部位。在此基础上确定了对声波钻孔的布置方案，并利用单孔声波检测方法确定了损伤区深度。为了实现颗粒流程序PFC对损伤区的模拟，通过三轴压缩试验确定了PFC的细观参数。最后利用PFC描述了损伤区的分布，分析了损伤局部化特征和损伤程度的变化。结果表明PFC的模拟结果和检测结果具有较好的一致性，能够实现对损伤区特征的准确描述。研究成果对损伤区的检测和支护优化设计具有指导意义。

Abstract

When the tunnel is excavated

the surrounding rock will be damaged and the damage zone will be formed around the profile where the acoustic velocity will weaken. Direct at the damage zone formed after diversion tunnel #3 of Jinping hydropower station

the distribution characteristic is discussed and the stress paths of characteristic points are monitored by simulation method. The stress states of characteristic points and locations of acoustic velocity weakened are confirmed. According to above work

the drill holes of detecting acoustic wave are arranged. The depth of damage zone is determined by single hole detection method. In order to realize the simulation of damage zone by the particle flow code(PFC)

the microscopic parameters are confirmed by triaxial compression test. The damage zone distribution is described by PFC. The local damage and damage extent are also analyzed by PFC. The simulated results are well consistent with the detections. The exact description of damage zone characteristics can be achieved by PFC. The research results can direct the detection of damage zone and support optimal design.

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