Experimental Study on Drainage of Strata Water-Bearing and Permeability in Huangyuchuan Coal Mine

The pumping test was carried out by arranging pumping holes in the ground of Huangyuchuan Mine to test the water inflow, permeability coefficient and influence radius of different hole positions, and to master the characteristics of water and permeability in the formation to avoid water inrush in underground coal mining. The results show that: Ordovician limestone strata develops water-conducting channels such as water-conducting fracture zone, fracture zone and collapse column; the influence of aquifer on 9# coal seam mining is more serious than other coal seams; after the pumping is completed, the aquifer water is replenished to the pumping hole，and the liquid level is restored to the depth of the water before pumping within 24 hours; the amount of water inflow from the ground drilling pump test is between 0.018 m3/h and 2.412 m3/h, and the average unit water inflow is 0.036 L/s·m, which is a weak aquifer; the permeability coefficient is 0.002 4 m/d, which is a weakly water-permeable aquifer.