双护盾TBM施工隧洞岩爆特征微震监测研究

Research on Characteristics of Rockburst in Tunnel Excavated by Double Shield TBM Based on Micro-seismic Monitoring

为了研究深埋隧洞在双护盾TBM施工环境下的岩爆特征,以某公路隧道为例对微震监测成果进行了统计整理,并在此基础上分析了微震事件与掌子面位置、岩体完整性以及隧洞埋深等之间的相关关系,获取了该工程岩爆事件发生的规律。成果表明,在隧洞采用双护盾TBM开挖过程中岩爆事件并非主要集中在掌子面附近,岩爆存在一定的延迟性和超前性,岩爆发生与开挖过程的时间效应及距离范围存在一定规律。同时,岩爆的能量等级和发生频次与岩体结构及隧道埋深也存在关联性。深埋隧洞在双护盾TBM施工环境下的岩爆规律的研究对类似工程具有一定的借鉴意义。

In order to study the characteristics of rockburst in deep-buried tunnel cut by double-shield TBM,the results of micro-seismic monitoring were statistically analyzed by taking a road tunnel as an example. On this basis,the correlation between the micro-seismic event and the position of the tunnel face,the integrity of the rock mass and the depth of the tunnel were analyzed,and the law of the occurrence of the rock burst was obtained. The results show that the rock burst events are not mainly located near the tunnel face and are usually delayed and advanced during the construction progress excavated by double shield TBM. Time effect of rock burst occurrence and the excavation process and the distance from there is a certain rule. At the same time,the energy level and frequency of rock burst are related to the rock mass structure and tunnel burial depth. The study on the rock burst regularity in the construction environment of double shield TBM is of great significance to similar projects.