Analysis Of Hydrogeological Conditions And Prediction Of Mine Water Inflow In Huainan Xinji Second Mine

The mine water inrush is one of the most dangerous geological disasters in the production process of coal mine,which often results in heavy casualties.The economic losses caused are listed in the top three coal mine accidents.In order to make the coal mine safe and efficient,it is necessary to systematically analyze the hydrogeological conditions of the mine,accurately predict the water inflow in the mining area and effectively prevent the occurrence of the water inrush accident.This research had great significance for mine safety production.Based on the collection and arrangement of geological and hydrogeological data of Xinji Second Mine,the mechanism of formation and mutual cutting and combination of the mine field had been systematically analyzed.The hydrogeological conditions such as tectonic development characteristics,structural water controlling action,hydrochemical characteristics and hydraulic relations between aquifers had been studied.Based to the analysis of water inrush disaster in coal seam 1,the hydrogeological characteristics and water-richness of limestone had been clarified.The water inflow in the aquifer of 1st coal roof and floor had been calculated by analytical method.Based on the analysis of hydrogeological conditions and prediction of water inflow in Xinji Second Mine minefield,the measures to prevent and control water in coal mining had beeb put forward.The main achievements include the following:(1)The geological structure of the mining area is complicated and the fault is developed.By analyzing the geology,hydrogeology,drilling data and pumping test in the mining area,the characteristics of each aquifer and the recharge,runoff and drainage of groundwater had been determined.(2)Through the analysis of water hazard factors of mines,it had been confirmed that the water source of filling water in the mines is the in-situ system coal-series sandstone fissure water and the Taiyuan formation limestone karst fissure water.Native joints and fissures are the direct water-filled channels for face mining,the fracture fissures of the bottom are limestone water into the mining face of one of the main channel.(3)According to the mining level of 1st coal in the mining area,the normal water inflow and the maximum water inflow of the mine with the level of-750m and-1000m had been predicted by the "Big Well Method" in the analytic method.(4)According to the hidden dangers of water hazards in mines,the prevention and control measures had been proposed.Coal seam roof sandstone fissure water hazards had been using "first geophysical exploration,post-drilling verification and drain" program.Limestone water hazards had been using "hydrophobic buck,grouting reconstruction" of combining program.