Abstract:Based on the study of water inrush mechanism from coal floor in coal mining above confined aquifer, the water inrush mechanism and law were studied by using ANSYS through translating solid-fluid coupling equations into thermal analysis problem. Taking the Wuyang mine of Lu¢an coal mining administration geology as an example,the comparison of coal seam floor¢s stress,strain and water pressure distribution rules of working face is studied when the working faces keep away from or are close to collapse column. The results show that stress,displacement and seepage field of surrounding rock mass do not influence each other when working faces keep away from collapse column. With working face being pushed close to working face,alteration of the stress-strain curve,water level pressure of water-bearing structural zone in seepage field all will take place,and the approximate boundary distance is about 50 m. It is found that alteration of stress is small as working faces keep away from collapse column,and the degree of stress concentration remains stable. However,the distribution range expands and diffuses speedily to collapse column. The highest water level of water inrush from solid seepage is located at the 15–20 m backside of working face,so water inrush from concealed collapse column is commonly the water inrush lagged.