Coal Mining Affected to Underground Water and Underground Water Storage and Utilization Technology

According to modernized coal mining affected to the underground water and the mine water drainage, evaporation, lost and other problems occurred in S hendong Mining Area, the geophysical exploration and drilling survey and observation, model experiment, numerical simulation and other means were applied to reveal underground water migration law of over passed 10 years coal mining in Shendong Mining Area. That was to say, when water table of Quaternary loose and pore aquife r was reduced by 20% ~ 30%, water quantity refilled reached balance and the water table would be steady basically. The crack water of the base rock was the main sou rces of the present mine water inflow. Based on the modernized coal mining affected to the underground water law, spaces between falling rocks in goaf of ultra large C oal mining face were developed as water storey space. With construction of the coal pillars and man made dams, underground reservoir in the underground coal mine W as set up and underground mine water storey and utilization were realized.