引汉济渭秦岭隧洞5号支洞岩爆微震响应研究

Microseismic response law of rock burst in No.5 branch of Qinling tunnel of Water Diversion Project from Hangjiang River-to-Weihe River

以引汉济渭秦岭输水隧洞5号支洞为研究对象,微震监测技术为手段,微震数据及岩爆实录资料为基础,分析了诱发岩爆的原因,并在此基础上探究了微震事件活动与岩爆的关系。研究结果表明:地应力和掘进速率是诱发岩爆产生的主要影响因素,且埋深不同,其对岩爆产生的影响程度不同;微震事件的空间分布特征与掌子面位置存在紧密联系,其"时、空、强"特征可以形象地演示岩爆的产生过程并用于对岩爆的预测预警;岩爆不会一直持续发生,而是会经历扰动开挖-裂隙产生-岩体储能-裂纹发育贯通-能量释放的过程,且当能量释放不彻底时,容易形成频发型岩爆。

With the No.5 branch of Qinling tunnel in Water Diversion Project from Hangjiang River-to-Weihe River as a research object,based on microseismic monitoring technology and microseismic date and rock burst date,we analyze the induced causes of rockburst and the relationship between microseismic events and rockburst.The results show that the ground stress and the excavation rate are the main inducing factors to rock burst,and the depth of tunnel burial varies,the degree of influence varies.The spatial distribution characteristics of microseismic events are closely related to the position of the tunnel face,and characteristics of microseismic events in time,space and degree can vividly demonstrate the process of rock burst and be used for prediction and early warning of rock burst.Rock burst will not continue to occur,but will undergo the process of disturbance excavation,fracture generation,rock mass energy storage,cracks development and transfixion,energy release.When the energy does not release completely,the rock burst would develop to frequent rock burst.