Influence Mechanism Research Of Coal Bump Induced By Thrust Fault Based On Huge Thick And Hard Roof

The features and precursory information induced by thrust faults in the conditions of the extra thick and hard roof was studied through the site monitoring of the Yima Mine in this paper. And the mechanics analysis of thrust faults starting sliding is conducted combining with actual site. The distribution law of the horizontal tectonic stress and vertical stress of hanging wall and footwall of thrust faults were studied. And then the critical danger zones of faults slipping were preliminarily proposed. The variation characteristics of stope stress field, energy field, roof subsidence, nomal stress and shear stress of the fault plane and slippage of the fault plane of the factors inducing coal bumps under the mining influence were studied by using the numerical analysis method in the conditions of different fault dips, different fault throws and different distance to fault. Taking the Qianqiu mine as the main study object,3D geological model of the complicated structure of the thrust fault was set up. The key meshing problems of complicated refinement models were solved. And3D geological model can be converted into numerical virtual mining model. The mechanism of complicated thrust faults for coal bumps was studied by deep analysis of these factors. And then the multi-level monitoring method mainly using microseismic, electromagnetic radiation was proposed to the dangerous zones of coal bumps. The method of microseismic positioning based on steady simulated annealing-simplex algorithm was focused. It can be more accurate to track the danger souces. The study is not only helpful to deeply understand the mechanism of coal bumps induced by thust faults, but also there is a significance of prediction and prevention for coal bumps induced by faults in deep mining.