Risk Assessment of Water Inrush in Coal Mine through Fault Based on Forchheimer and Non-Darcy Flows

Abstract Fault water inrush accident in coal mine construction is a serious hydrogeological disaster, which seriously endangers the safe operation of underground engineering. In process mining resources Western China, large number accidents have occurred. Based on investigation geological conditions fault Pingdingshan mine, coupling model Darcy laminar flow and Brinkman used to analyze mechanism fault. On this basis, considering higher permeability rate, may not be simulate nonlinear at Two improved models, equation Forchheimer are inrush. two-dimensional finite element method, into zone analyzed. The pressure velocity nephogram under different evolution characteristics non-Darcy effect influence coefficient analyzed through parameter study. variation coefficients ξ (the ratio kF aquifer constant kA) fluid field changes, Fletcher rate compared with theoretical data.