地表动水条件下综采工作面开采水害隐患及防治技术研究OA

To scientifically guide the prevention and control of water hazards in the mining of fully mechanized mining faces under surface water conditions in the western region,and to achieve green and safe coal mining,taking the 820 working face of Huangling No.1 coal mine as the engineering background,a combination of hydrogeological condition analysis,numerical simulation,and comprehensive analysis was adopted to systematically sort out the hydrogeological conditions and water hazards faced by the working face,reveal the evolution law of the water conducting fracture zone,evaluate the feasibility of safe mining of the working face,and propose hidden water hazard prevention technology.The research results indicate that the water conducting fracture zone in the working face exhibits a slightly outward expanding"saddle shape",with a maximum development height of 85.0 m and a fracture mining ratio of 28.33,affecting the lower aquifer of the Zhiluo Formation.The water inflow mode of the working face is as follows:the aquifer in the lower section of the Zhiluo Formation flows directly into the underground through water conducting cracks;Surface water mainly infiltrates and replenishes the lower aquifer of the Zhiluo Formation vertically through the exposed bedrock of the river channel,and then flows into the underground.To eliminate the dual hidden dangers of roof water hazards and surface water hazards faced by the working face mining,water hazard prevention and control technologies were proposed,including pre mining roof drainage,fine exploration of hydraulic connections in aquifers,limited height mining,and surface water drainage.