Design and application of dynamic drainage scheme for Taiyuan formation limestone aquifer in working face floor of Shunhe Coal Mine

In order to further improve the reliability of confined water disaster treatment technology in Shunhe Coal Mine, reduce the threat of water disaster in working face, and solve the problems faced by the mine, such as limestone karst fracture development and high water pressure in the upper section of Taiyuan formation, the mine adopts the method of dynamic drainage and reduction, carries out outflow test, collects relevant data, and calculates the unit water inflow, permeability coefficient and other parameters of the main aquifer of the floor. The results show that the limestone aquifer in the floor of 2401 working face of Shunhe Coal Mine belongs to weak water-rich aquifer, which has good drainage ability. The dynamic drainage and reduction schemes with different equivalent drainage quantities are designed, and the drainage and reduction effects are calculated by using the unsteady flow theory and well group interference theory. When the overall equivalent drainage and reduction intensity reaches about 100 m³/h, the period of drainage and reduction is reasonable and the effect is obvious, which can realize the safe and economic mining of the working face. It is of great significance to improve the technical means of water disaster prevention and control of the floor of Shunhe Coal Mine and reduce the cost of water prevention and control project.