摘要
双江口水电站尾调交通洞埋深大,围岩主要由花岗岩组成,地应力高,地应力与岩体强度比值大,开挖卸荷作用下围岩极易发生岩爆现象。结合地质资料、开挖形式,对岩爆分布及破坏特征进行了分析。并利用微震监测,采集微震事件频次并分析微震事件特征,揭露了岩爆与微震事件的内在联系。研究结果发现:双江口尾调交通洞微震事件主要聚集于靠山侧,在岩爆发生前24 h突然聚集;高应力围岩在开挖作用下的应力调整是岩爆发生的根本原因。该研究结果可为类似工程中岩爆的监测与预报提供一定的借鉴作用。
The traffic tunnel of tailwater surge chamber in the Shuangjiangkou hydropower station is deeply buried underground,where the surrounding rock is mainly composed of granite,and the ratio of the ground stress to rock mass strength is high,so it is common for rockburst to occur during the unloading process by excavation.Combined with the geological information and excavation,the distribution and failure characteristics of rockburst are analyzed.Microseismic monitoring is used to collect and analyze microseismic events and reveal the internal relationship between rock burst and microseismic events.The result shows that the microseismic events are mainly occur on mountain side and suddenly increased in the 24 h before rockburst.Stress redistribution of surrounding rocks after excavation is the main cause of rockburst.The research results can provide reference for monitoring and forecasting rockburst in similar projects.
作者
褚冬攀
吴帮标
王奇智
CHU Dong-pan;WU Bang-biao;WANG Qi-zhi(State Key Laboratory of Hydraulic Engineering Simulation and Safety,School of Civil Engineering,Tianjin University,Tianjin 300072,China)
出处
《科学技术与工程》
北大核心
2018年第28期151-155,共5页
Science Technology and Engineering
关键词
双江口水电站
高地应力
岩爆
微震监测
Shuangjiangkou hydropower station
high geostress
rockburst
microseismic monitoring
