The Hydrogeologic Condition And Water Hazard Control Of The Second Division Of Yang Chang Wan Coal Mine

Taking the second division of Yang Chang Wan Coal Mine of Ningxia Shenhua Coal Industry Group CO., Ltd. as a study area, according to research on its basic situation, geological conditions, hydrogeological characteristics and related data, using Q-S curve method, Big-well method, Analogy method, the future extension of the mine water inflow was calculated and corrected separately. Then the result of its normal water inflow was 357.2m3/h and maximum water inflow was 616.7m3/h were obtained when the coal mine was exploited to the second level +804m. After detailed analysis on the inundation factors of mining area, it was proposed that the waterproof measure was used primarily to XiTian River and precipitation, though there was little water quantity and long duration. The laying artificial riverbed was used to XiTian river; as to the precipitation, landfill and compaction were used to treat the fracture and collapse on the ground surface. It was also proposed that the leave waterproof coal pillar and drainage combined method were used to treat the goaf water and the water surrounding rock medium, which were large water quantity but easier to dewater. Finally based on the corresponding standard, total drainage system of the second stage of the coal mine was designed, the mine pumps and related motors at the second stage of the coal mine was identified and two journey seamless steel tubes which laying down the tube channel and the downword track for the second mining area were used to take mine water from sump which effective volume was 2857.6m3 to the sump which effective volume was 1574.4m3 and installed at +1050m level, then mine water was discharged from the mine.