The Discussion On The Prevention Methods Of The Underground Opening Complex Of Jinping Ⅱ Hydropower Station

In recent years, many buried deep tunnels appear in our hydropower , transportation engineering fields. Rockbrust problem has become one of the most outstanding rock mechanics problems during the tunnel excavation process.As is known to all, rockburst can lead to significant safety accidents to the state and the masses of life and property safety hazard. Rockburst prevention is a technical problem to be overcome at home and abroad.In Jinpingâ…¡Hydropower station,the assistant tunnel,drainage holes and water diversion holes are all buried deeper than 2000m,the rockbrust happened in earilier time is rarely seen. It is an urgent need to combine with engineering practice in-depth study rock blasting prevention and control technology.This paper focused on the following job:In this paper, the producing mechanism of rock burst in rockburst classification method of rockburst is concluded, the monitoring and control methods are analyzed. Combining Jinpingâ…¡Hydropower station tunnel engineering, the paper analyzed and summarized the rockburst phenomenon and the characters of occurrence regularity in Jinpingâ…¡Hydropower station.Process rock bolting system and seismic monitoring research. Take Jinpingâ…¡Hydropower station cavern group for example, this paper introduces bolting and safety rapid supporting technology, research water-expansive anchor-bar, prestressed hollow shell bolt up, the constant resistance large deformation anchor and nanoparticle rapid imitation united steel fiber shotcrete support measures of their respective advantages and disadvantages, and process field test.This paper expounds the application of rockburst monitoring and prediction in the construction of tnnels in Jinpingâ…¡Hydropower station.