Research On Water Filling Evaluation And Water Disaster Prevention Technology Of 5^-2 Coal Seam In HongLiulin Mine

Hongliulin coal mine of Shaanxi coal chemical industry group is a modern mine with a production capacity of 20 Mt/a in Shenfu mining area.During the driving process of haulage gateway of 25209 working face in North panel 1 of coal mine,the water inrush event of water flowing through the fracture was caused by water inrush from burnt rock fracture,and the mine water sprayed more than 2m along the fracture.The investigation found that the research on the water filling conditions of 5-2 coal seam in the North panel of the mine is insufficient,which affects the safe and efficient mining of the mine.Through theoretical analysis,numerical simulation,field monitoring and other methods,this paper studies the evaluation and prevention technology of water filling ability of 5-2 coal seam in hongliulin coal mine,and draws the following conclusions:Paper with red grahame north a panel 5-2 coal mine coal water filling characteristics as the research object,through the study area and the surrounding of flood water information collection,in combination with the study area 5-2 coal added hydrogeological exploration project,hydrogeology,hydrogeochemistry,mine geology,petrology and subject theory and technical methods and statistics,and so on in-depth analysis to systematically study 5-2 coal mine water filling water source and water filling channel,analyzed main charge 5-2 coal mining hydrogeological characteristics of the water level.The research conclusion is as follows:5-2 coal mining direct water filling sources are atmospheric precipitation,surface water,old(mining)empty water and groundwater,etc.;5-2 The main water-filling sources of coal are goaf water and groundwater,and the indirect sources are quaternary unconsolidated rock diving and atmospheric precipitation in coal seam.The water-filling channel is the roof water-guiding fracture zone,and the roof water-guiding fracture zone will run through the whole roof coal-bearing bedrock.According to theoretical calculation,the height of the water-conducting fracture zone in No.5-2 coal seam is 19.18?136.09m,with an average of 75.23 m.According to the numerical simulation results of the failure law of coal mining roof of5-2 coal mining,as the working face advances and goaf area continues to increase,the plastic zone develops upward,the development height of water-conducting fracture zone remains stable at 89.8m,and the fracture mining ratio is 17.96.(4)Put forward the prevention and control water technical measures combining the exploration of "joint water release test up and down,advanced underground exploration and water release,surface hydrogeological supplementary exploration" and "local roof drainage".The verification results of the roof drainage project of 25210 working face show that the threat of water damage in this area has been basically relieved,which indicates that the water control technology of "advanced exploration and drainage and local roof drainage" for 5-2 coal seam in Hongliulin Coal Mine has obvious effect.