Karst Hydrogeological Characteristics and Prevention and Control Technology for Water Damage in Zhungar Coalfield

The hazard of karst water is one of the key factors affecting the safety of mining in Zhungar Coalfield. In order to master karst development characteristics, hydrochemical characteristics, seepage field characteristics and water inrush risk, the analysis was carried out comprehensively by the regional data of drilling, hydrological exploration and hydrochemical experiment. The analysis indicates that karst fissures, karst holes and karst caves are the main water storage space and groundwater runoff channels, and collapse columns and faults are important vertical water conducting channels in this area. The evolution sequence of karst water quality type along the run-off path is HCO₃·Cl-Na→ HCO₃·Cl-Na·Ca（Ca·Mg）→Cl-Na, which indicates that the Yellow River water supplies groundwater at the eastern boundary, and karst groundwater generally moves westward, forming a stagnating area in the west of coalfield. The analysis also shows that No. 6 and No. 9 coal in the middle and eastern part of the coal field are all in non-belt pressure mining state, and the western coal field is in pressure state. The water inrush coefficient is large near the border of stagnating zone. Based on the study of the hydrogeological characteristics of karst aquifer, a comprehensive technical system for the prevention and control of water hazards such as detection, prediction, monitoring, control and special mining is proposed.