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Sublevel caving method without bottom column and filling method were used for mining in a mine. This paper studied the change of stope ground pressure and stope stability when two mining methods were used simultaneously. FLAC3D numerical simulation technology was used to simulate the evolution law of stope ground pressure in this mine, and microseismic monitoring technology was used to verify the simulation results. The results showed that with the development of sublevel caving method, the stability of the lower consolidated backfill was significantly improved, and the force on the lower stope pillar was on the decline. After the mining of sublevel caving method, the vertical stress of the lower stope pillar decreased by about 35%. Thus, it was proved that the mining method of sublevel caving without bottom column can effectively relieve the ground pressure in the lower filling stope and is conducive to improving the stability of stope. [ABSTRACT FROM AUTHOR]

The bedding rock slope is affected by natural geological structure and its stability is relatively poor. However, under the influence of strong degradation factors such as heavy rain, blasting and earthquakes, its stability is more threatened. Therefore, based on the strength reduction theory, this paper analyzed the stability of the bedding rock slope of a mine by numerical simulation. Meanwhile, this paper studied the position of the sliding surface of the rock slope, the lateral deformation and the stress change law of the rock slope under the bedding design and two optimization schemes under the three conditions of heavy rain, blasting and earthquake. The research results indicated that: the earthquake had the greatest impact on the stability of the bedding slope of the mine; in addition, the safety factor of the slope under the conditions of the proposed design scheme was lower than the standard value, and the slope was in an unstable state. Through the optimization study of the bedding slope of the mine, the optimal design plan of the mine was obtained. [ABSTRACT FROM AUTHOR]