Solving the Ultimate Water Accumulation Depth of Artificial Dam in Coal Mine Underground Reservoir Based on The Galerkin Method

In order to improve the problem of low utilization rate of groundwater in the process of coal mine production, some mining areas in northwest China use the goaf of the working face as a water storage space, and establish underground reservoirs to realize water retention mining. In order to solve the problem of the stability of the underground reservoir structure, this paper studies the ultimate water level height that the artificial dam can bear. The concrete wall of the artificial dam under the action of water pressure is simplified as the mechanical model of the four-sided solid support plate, and the expression of the strain deflection and the expression of the internal stress function of the dam are derived by using the Galerkin method. The ultimate head height that the dam can withstand is calculated to be 22m.