Study On The Hydro-geological Meticulous Evaluation And Technology Of Drainage And Dewatering In Yongxia Mining Area

In this paper,combining with the geological structure distribution of the Yongxia Mining area in Henan Province,take the Chengjiao and Juji Coalmines as example.Through the systematic statistics and comprehensive analysis of the distribution of the major structures,hydro-geological characteristics and existing 11 pumping?discharge?test data,this paper conducted 5 discharge tests in typical blocks and the analysis research on the hydro-geological data and grouting data that exposed by 3984boreholes in 31 typical working faces.By comprehensively studying of the development of karst fissure,boundary characteristics,conditions of groundwater recharge-discharge,water abundance regularity and cycle conditions of the Taiyuan Formation limestone aquifer below the No.II₂ coalseam in two Coalmines,divided the blocks of hydro-geological condition and meticulouly evaluated hydro-geological parameters.Combined with the existing experience of floor water prevention and control in Yongxia mining area,comprehensively considered the hydrogeology regional features in two Coalmines and the evaluation and of mining under water pressure of the Taiyuan Formation limestone.This study chose the 22006 working face in Chengjiao Coalmine as the typical face to find out the feasibility of drainage and dewatering in a isolated hydro-geological unit,and researched water prevention and control technology.Using the analytical methods and MODEFLOW numerical simulation methods to predict drawdown and achieved the successful production after drainage and dewatering to drop pressure in the typical face.Study on the hydro-geological meticulous evaluation in Yongxia mining area in this paper has overall reveals the hydrogeology regional features,groundwater recharge-discharge and its circulating law in the research working face.The feasibility of drainage and dewatering to achieve prevention of mining water hazards and safe mining in typical working face floor which has been researched and practiced,which has important theoretical significance and practical value in safe mining and innovating the technique of prevention of mining water hazards.