锦屏二级水电站引水隧洞工程强岩爆综合防治措施研究

锦屏二级引水隧洞工程一般埋深1500～2000m,最大埋深2525m,具备发生强至极强岩爆的条件,工程开工以来已发生多次强岩爆.为最大限度降低强岩爆对工程安全和进度的影响,结合辅助洞和排水洞的施工经验,锦屏二级引水隧洞工程采用了微震监测、应力爆破解除、中空预应力注浆锚杆、水涨式锚杆、纳米仿钢纤维混凝土等综合防治措施.这些措施的综合运用在水电和交通隧道工程领域尚属首次,并已取得一定成果.

Study on comprehensive measures for control of heavy rockburst during construction of diversion tunnel for Jinping Hydropower Station II

The buried depths of the diversion tunnels for Jinping Hydropower Station II are usually 1 500~ 2 000 m with the maximum depth of 2 525 m,therefore,the tunnels have to be excavated under the conditions of possible heavy rockbursts and a number of rockbursts have been actually happened therein since the start of the excavations.In order to lower the impact from rockburst on safety and progress of construction maximally,the control measures such as micro-seismic monitoring,blasting stress relieving,pre-stress...