Simulation method for stress recovery of caving gangue in goaf

The invention discloses a goaf caving gangue stress recovery simulation method, which comprises the following steps: S1, collecting parameters: acquiring rock mechanical parameters and thickness data of each rock stratum by collecting mining area drilling data; s2, building a model, and building a three-dimensional geologic model based on existing parameters; s3, stress recovery calculation: calculating stress recovery states under different mining step pitches; s4, load simulation: applying a vertical load to the model to simulate the vertical stress applied to the surrounding rocks of the roof and the floor by the caving coal gangue in the mining process; and S5, simulated mining is carried out on the model, and the dynamic process of stress recovery is observed. According to the method, the dynamic change condition of the action of the caving coal gangue on the top and bottom plate surrounding rocks in the mining process is obtained through calculation, and then the equivalent vertical stress is applied to