江边电站引水隧洞岩爆及其防治分析

Analysis on rock-burst of diversion tunnel of Jiangbian Hydropower Station and its prevention

在隧道及地下工程施工过程中,岩爆现象时有发生,岩爆产生的危害也较大。由于岩爆发生的时间、强度及具体位置的不确定性,给岩爆的预测及其防治带来了困难。从江边电站引水隧洞支洞岩爆状况入手,结合现场实测的地应力值和岩石单轴压缩变形试验,并通过对岩爆发生的力学机制及其预测的研究分析,提出了防止岩爆发生的对策和安全措施,实现了工程高强度岩爆洞段的快速安全施工,为洞室开挖设计和岩爆监测预报提供了参考依据。

In the construction process of tunnel and understructure,the rock-burst often occurs and brings about serious hazard.Due to the uncertainty of its occurrence time,intensity and concrete location,it is difficult to predict and prevent such accidents.In the light of rock-burst condition in water diversion branch tunnel of Jiangbian Hydropower Station,based on in-situ geo-stress and single-axis compression test,the mechanics mechanism and prediction of rock-burst are researched and corresponding countermeasures for prevention and safety precaution are put forward.A quick and safe construction in high intensive rock-burst tunnel has been realized,which provides reference for the tunnel excavation design and rock-burst monitoring and prevention.