Mechanism Of Coal Bumps Induced By Fault Reactivation

The mechanism of fault reactivation and the coal bump it leaded was studied through experimental research, theoretical analysis and field practice. First, a similar model experiment was taken to simulate the stoping face with a fault. The evolution of the fault stress and abutment stress response to the transient process of fault slip were both studied, meanwhile, summarised mechanism of the fault reactivation caused by mine-induced stress. Second, based on the double shear friction method, sliding friction experiment was designed for4kinds of rock and coal samples to simulate the fault reactivation and destabilization of coal and rock structure combination. In the experiment, the thesis studied the prerequisites of instability sliding, the sliding type under certain conditions, displacement evolution and acoustic emission characteristics with the sliding process. Third, mathematical model was built to describe the fault sliding. Based on the coal deformation and failure characteristics, the model can fit the attenuation creep and accelerated creep pattern. Fourth, numerical means was used to study the law of fault reactivation influenced by the exploitation way, giving a supplement and verification of the conclusions of the indoor experiment. At last, according to the measured data of coal bumps, the law of coal bumps under the influence of a fault was studied. Evaluation of multi-parameter monitoring warning methods and measures were given in the end.