Experimental study of acoustic emission monitoring in situ excavation damage zone of Beishan exploration tunnel

CHEN Shi-wan; YANG Chun-he; WANG Gui-bin; LI Er-bing; CHEN Liang

doi:10.16285/j.rsm.2017.S2.048

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Experimental study of acoustic emission monitoring in situ excavation damage zone of Beishan exploration tunnel

更新时间：2026-06-25

- Experimental study of acoustic emission monitoring in situ excavation damage zone of Beishan exploration tunnel
- Vol. 38, Issue S2, Pages: 349-359(2017)
- 作者机构：
  
  1. 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆,400044
  2. 中国科学院武汉岩土力学研究所,湖北,武汉,430071
  3. 解放军陆军工程大学国防工程学院,江苏,南京,210007
  4. 核工业北京地质研究院环境工程研究所,北京,100029
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.S2.048
  CLC： TU452
- Online First：05 June 2018，
  
  Published：2017
- 稿件说明：
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CHEN Shi-wan, YANG Chun-he, WANG Gui-bin, et al. Experimental study of acoustic emission monitoring in situ excavation damage zone of Beishan exploration tunnel[J]. 2017, 38(S2): 349-359.
DOI：

CHEN Shi-wan, YANG Chun-he, WANG Gui-bin, et al. Experimental study of acoustic emission monitoring in situ excavation damage zone of Beishan exploration tunnel[J]. 2017, 38(S2): 349-359. DOI： 10.16285/j.rsm.2017.S2.048.

摘要

为研究爆破开挖对围岩的损伤，在高放废物地质处置地下设施（北山坑探设施）开展了开挖损伤区(EDZ)的研究。对多个爆破回次开挖全过程进行了声发射监测试验，根据声发射撞击数演化特征，将爆破开挖围岩的损伤过程分为爆破损伤段和渐进损伤段，分析了声发射信号频率演化规律。根据两阶段信号参数特征分析了对应阶段微破裂机制，通过高频探地雷达圈定了开挖损伤区范围，发现各回次开挖损伤区的厚度与声发射撞击数具有较好的相关关系，并分析了室内及现场试验岩石（体）的“蠕变”特征与声发射演化规律。分析认为，爆破后声发射演化特征是围岩渐进损伤过程的直接体现，渐进损伤在位移上表现为“蠕变”特征，声发射能有效地表征围岩的变形过程及其所处的损伤状态。研究成果对声发射现场应用表征围岩的损伤状态具有一定参考价值。

Abstract

In situ experiments were conducted in Beishan exploration tunnel(BET) in Beishan

Gansu

the most potential candidate site of Chinese high-level radioactive waste repository

to study the rock damage caused by blasting. Acoustic emission(AE) was monitoring during all the blasting process. Firstly

blasting damage stage and progressive damage stage are identified based on AE evolution for each blast round. Then the evolution of AE signal frequency is analyzed; and the damage mechanisms for blasting damage stage and progressive damage stage are analyzed based on AE signal characteristics. The thickness of excavation damage zone of each blast round is delineated by ground penetrating radar with high-frequency antenna. The thickness of each blast round is correlated well with the number of AE hits. At last

we analyze the displacement and AE characteristic in laboratory creep test and field displacement measurement test. Since AE evolution is a direct indictor of progressive damage process

AE can be used to describe the creep behavior and the damage state of rock mass.

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