公路隧道微震监测系统构建与微震特性分析  

Construction of Microseismic Monitoring System and Analysis on Seismic Characteristics in Highway Tunnel

作　　者：李天斌[1] 刘天毅[1,2] 陈国庆 马春驰[1] 张航[1] Li Tianbin;Liu Tianyi;Chen Guoqing;Ma Chunchi;Zhang Hang(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,P.R.China;Sichuan Water Resources and Hydroelectric Investigation&Design Institute,Chengdu 610072,P.R.China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]四川省水利水电勘测设计研究院,成都610072

出　　处：《地下空间与工程学报》2019年第4期1188-1196,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41772329,41230635);地质灾害防治国家重点实验室团队重点课题(SKLGP2017Z001)

摘　　要：以紫荆隧道为研究对象,结合钻爆法施工过程建立了紫荆隧道微震监测系统。通过现场仪器设备的安装布设、信号采集识别及分析处理和围岩微震特性的分析,对交通隧道钻爆法施工开挖岩体微破裂萌生、发育、扩展的全过程进行监控,实现了微震活动的全天候全时段监测,并采用RFPA2D模拟隧道开挖过程中的岩体破裂行为,建立了一套适用于隧道钻爆法施工的微震监测体系与技术方法。微震监测结果表明,隧道开挖后拱顶和右拱脚区域微震活动活跃、震级较大,其余区域零散的分散着微震事件,微震事件在拱顶区域更为集中。模拟结果显示,开挖后拱顶区域破坏事件较多,声发射能力较大,最终发生似"X"型破坏,且破坏前出现了事件数量的突增现象。Taking the Zijing tunnel as the research object,combining with drilling and blasting method construction process of Zijing tunnel,a microseismic monitoring system is established. Through the installation of field instruments and equipment, signal acquisition and analysis of processing and seismic characteristics of the surrounding rock,the whole process of the rock mass micro-cracks initiation,growth and expansion during the tunnel excavation was monitored,the all-weather monitoring of microseismic activity was realized. The surrounding rock failure process during the excavation was simulated by RFPA2 D,and a microseismic monitoring system and technical methods of tunnel drilling and blasting method were developed. Microseismic monitoring results show that the seismic events are active and they have large magnitude at tunnel vault and the right arch foot,small magnitude events distribute in other regions,and microseismic events concentrate in the vault area. The simulation results show that there are more damage events in the vault,whose acoustic emission energy is large,and eventually,it’s destroyed like"X"type,the number of events increases quickly before the destruction.

关 键 词：公路隧道 微震监测 RFPA2D 钻爆法施工 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]