Abstract: Water inrush is one of the great disasters which threaten coal mine safety production.In order to discuss the law of velocity and pressure and reveal the change of flow state of water-inrush in mines,a non-linear flow model is used to simulate the complete flowing process of water-inrush in Yi′an coal mine.The study results show that when the water-inrush in Yi′an coal mine reaches to the maximum water emission,the pressure of aquifer is 0.2~0.3 MPa.Water-inrush is actually a process with pressure decreasing and velocity increasing,and the pressure drop of aquifer is the precursor of water-inrush.Besides that,the pressure and velocity varying at the out-inlet of the water-inrush channel are changed dynamically,the three flow fields are composed of an an integral whole.The vortex of water-inrush is the spatial response of laminar to turbulent flow,which indicates that the water-inrush is a process of flow translation.The further study results show that the stronger of water infiltration characteristics in water-inrush channel,the greater of water-inrush disaster.The above analysis results in this paper can provide some reference for confirming the reasonable mechanics parameters and the geometric structure of water-inrush channel.

Key words: Coal mine, High non-linear flow, Water-inrush, Forchheimer equation, Dynamic uniformity