Study On Simulation Of Dewatering And Lowering Water Pressure And Prevention Of Water Disaster In 1011 Area Of Tongting Coal Mine

In order to ensure the safe mining of coal seam 10 in Tongting Mine on high pressure water,this paper analyzes and evaluates the geological and hydrogeological conditions of the mining area on the basis of collecting geological and hydrogeological data of Tongting Mine.Taking the 1011 mining area as an example,the groundwater recharge,runoff and discharge law are analyzed;the water abundance of the mining area is detected by using the mine transient electromagnetic detection technology;the source of water filling and the amount of water inflow in the mining area are analyzed and calculated;the groundwater flow field in the mining area is simulated by analytical method and numerical method,and the feasibility of the dewatering of the bottom aquifer is analyzed.The water inrush coefficient method is used to analyze 10 The water resistance capacity of coal seam floor is evaluated,the water inrush risk of the floor is evaluated,the response mechanism of underground water filling to groundwater migration is analyzed,and the water prevention and control plan in mining area is formulated.The results are as follows:(1)Taking the position of JL1+18m in the middle section of 1011 auxiliary return tunnel as an example,the water rich detection is carried out by using the mine transient electromagnetic detection technology.It is found that there are 2 low resistance zones,which are consistent with the location of geophysical faults.Through drilling exploration and verification,the water yield is 15m~3/h,which is a low resistance water rich area.(2)The water filling source and water inflow of the mining area are analyzed and estimated.It is concluded that the normal water inflow of mining area 1011 is35.6m~3/h,the maximum water inflow is 70.6m~3/h,and the catastrophic water inflow is223.55m~3/h.Through production verification,the normal water inflow is 40m~3/h and the maximum water inflow is 78m~3/h,which is basically consistent with the prediction results.(3)Combined with the hydrogeological conditions of the mining area,the groundwater dynamic field model of the mining area is established.The water inrush coefficient method is used to analyze the water resistance capacity of the floor of coal seam 10.It is concluded that the northeast wing area with large buried depth of working faces 10115,10113 and 10111 is vulnerable to water inrush risk;The drainage and depressurization simulation of Taiyuan limestone aquifer in mining area1011 is carried out.The simulation results show that the Taiyuan limestone water in the study area can be drained.The four hole drainage scheme is recommended.It is estimated that the drainage volume in the mining area is about 55.4m~3/h,and the drainage time is about 120 days.The limestone supply and drainage volume can be balanced,and zero pressure recovery can be realized,with a total drainage volume of about 159000 m~3.(4)The response mechanism of underground water filling to groundwater migration is analyzed and revealed.The structure around mining area 1011 is a non water conducting fault,and the Taihui water can be drained.The atmospheric rainfall in the mine field has no obvious impact on the migration of Taihui water.The Taihui supply source is mainly the shallow four containing pore water flowing underground through the solution gap of Taihui outcrop,with a supply amount of about 15.22m3/h.The hydrogeological unit in the mining area is in a closed semi closed state.