The Numerical Simulation Method Based On Discrete Element And Treatment Measures About Rockburst Disaster Of Headrace Tunnel In Jinping Second Stage Hydropower Station

Rockburst is a geological disaster in underground engineering construction, the main damage types of rockburst are the inflation and collapse of local rock, rock block ejection and fracture, and a layer catapulted spalling, ejection rockburst usually happens suddenly and violently, and can produce threaten in a large range, and seriously threats the security of personnel and equipment.On the rockburst numerical analysis research side, there are many scholars around the rockburst carry out a lot of research work, but the majority is considered based on continuum mechanics of numerical analysis method. The main research work is rock stress distribution simulation when tunnel occurred rockburst, it’s certain difficultie to simulation rock discontinuous deformation and displacement when rockburst ejection. This paper based on the discrete element method connection medium, around rock block ejection with continuous and discontinuous mechanical behavior of rockburst failure process carried out numerical simulation research. The research results show that this method is feasible. Can realize rockburst ejection failure occurs rock mass by continuous small deformation in a very short time quickly into non continuous large deformation process of fine numerical simulation, provides a possible way, it provides a possible way for rockburst ejection failure of accurate prediction provides a possible way.Furthermore, according to the collected rockburst damage and its treatment measures material of headrace tunnel of Jinping second stage hydropower station, based on analysis typical rockburst damage case and rockburst damage main failure mode evaluation and analysis the rockburst treatment measures and its effect. And summed up a set of considering rock burst failure mode and its intensity levels of rockburst treatment measures for future proposed or construction in deep underground tunnel engineering of rockburst provide basis for treatment.