Calibration of Water Inrush Channel and Numerical Simulation of Water Inrush Process in Coal Mine Roof

The surrounding rock of a coal mine roof fractures with the excavation underground working face in mining. These mining-induced are connected and extended upward to form water inrush channels. A accident may occur when there is sufficiently large source. To elucidate formation mechanisms channel characteristics goafs, we performed case study No.18401 Panel Xiqu Coal Mine China determined whether by theoretical calculation microseismic monitoring. modified mechanical parameters masses were embedded into numerical model based on data. Microseismic monitoring simulation organically combined analyze connection process channel, after which calibrated Panel. We established non-Darcy flow for water-conducting fractured zone mines coupling Darcy, Forchheimer, Navier–Stokes equations. Finite element language its compiler (FELAC) was used mechanism seepage. results show that pressure, velocity, porosity non-uniform occurrence development, mixed fluid mainly passes through “dominant channel.” development accompanied release hydrostatic pressure aquifer, sudden increase velocity at position, concentration. Hence, can be predicted prevented aforementioned indicators. This research great significance calibration prediction disasters.