Mechanism of water-inrush from fault induced by mining near the working face

摘要

Adopted the fractal tree-like failure model, and established the renormalization group transform function of fractured fault, and investigated the mechanism of water-inrush from fault, and found out the critical probability of water-inrush from fault caused by fault fracture. The results indicate: when the failure rate P is less than the critical failure rate P_c=0.206 3, the failure of the system is just partial. When P is more than the critical failure rate P_c=0.206 3, the random distributed crannies concentrate to certain domain of attraction (such as the maximum shear stress face in the fault) gradually. The process will continue until the crannies run-through, forming conductivity channel, and cause water-inrush from fault.