Study On The Hydraulic Conductivity Characteristics Of Mining Overlying Strata And Exploration Drainage Technology In Xin Shun Coal Mine

For a long time, the goaf water inrush accident is the major hazard in coal mine safety. During 15# coal seam mining in Heshun mine area of Qinshui coal field, there is a hidden danger of goaf water on 4# coal seam. Because of the complexity geological conditions and rock mass structure, the past studies were based on the specific geological conditions. Therefore, in order to solve this problem, we research the development height of water flowing fractured zone and its seepage law of the overlying rock under mining on Xinshun coal field in Heshun mine area.Taking Xinshun coal field in Heshun mine area as the research object, basing the roof and floor lithologic features of the first working face in 15# coal seam, using the methods of theoretical analysis, numerical simulation, similar material simulation and regression analysis, this paper researched the production and development law of the overburden rock water flowing fractured zone, analyzed the seepage feature of the overlying rock fissure water.It has been discovered that flowing water zone of overburden rock under mining was formed on the ladder boundary fracture surface by using similar simulation. The ladder boundary grew up on the working face, and changed with the periodic weighting in regularity. The formation of caving boundary, the development process of inverse V type—M type—inverse V type, was found by numerical simulation to research the relation between caving morphology and displacement change of overburden rock fracture field. It has been determined that overburden rock flowing water fracture zone could grow up to 4# coal seam floor. Based on the analysis of overburden rock permeability, it was concluded that overburden rock fracture water could flow into 15# coal seam gob along with flowing water fracture zone, and its velocity in working face overburden rock breakup boundary is more than in upper part of gob by simulating the variation of overburden rock fracture water seepage. Based on simulation datas and using regression analysis, the prediction formula of overburden rock flowing water fracture zone under the geological conditions of Xinshun coal mine was fitted out. The research results could provide some theoretical basis and technology support for theoretical research and project practice of overburden rock breakup.