Research On Control Technology Of Karst Water Disaster In Xiaotun Coal Mine

Xiaotun coal Mine is located in the south of Dafang County,Guizhou Province.Because the mine is buried shallow and in a mountainous area,karst landform is developed,the mine inflow is greatly affected by atmospheric precipitation.Especially since 2014,with the increase of mine goaf area,the direct supply of limestone water from changxing limestone receiving roof of the mine increases,the mine inflow increases significantly,and the pressure for karst water damage prevention increases sharply.Based on the theory of groundwater system,this paper analyzes the karst water system in the first mining area of Xiaotun coal mine.Information of karst water system in mining area is excavated from multi-source information such as survey data,mining project disclosure data,water level,water temperature,hydrochemistry,etc.The replenishment effect of atmospheric rainfall on karst water and the centralized replenishment channel are quantitatively or semi-quantitatively ascertained.The boundary of karst water-bearing system in the first mining area of Xiaotun coal mine is delineated.The structural characteristics of karst water-bearing system are analyzed.The prevention and control measures of karst water in mining area are put forward,and the main results are as follows.(1)Analyze the main controlling factors of Xiaotun Coal Mine's water hazards and their influenceThis paper analyzes the water-filling conditions of the mine,studies the hydraulic connection characteristics between different aquifers,aquifer recharge runoff and discharge conditions,evaluates the threat degree of the water-filling source of the main mining coal seam to the mine,based on this,summarizes the main controlling factors of karst water damage control,and analyzes its influence degree.(2)Propose a method for predicting coal water inflow in the upper group of limestone aquifersThe design of mine drainage system must be based on the forecast result of mine water inflow,so the forecast technology of mine water inflow is one of the key technologies of mine water disaster prevention.Based on the mining conditions of Xiaotun coal mine,this paper makes an accurate prediction of mine water inflow.(3)Formation of a key technology system for the prevention and control of roof karst water hazards in Xiaotun Coal MineThis study takes the problems encountered in the water hazard prevention and control in Xiaotun coal mine as the main research content,and combines with the water hazard prevention and control project of Xiaotun coal mine to form a set of key technology system of karst water hazard prevention and control in Northern Guizhou mining area with Xiaotun coal mine as the template.