Analysis Of The Law Of Surface Movement And Deformation In Repeated Mining

After the mining of underground coal resources,it will cause complex movement and deformation of strata and surface in time and space.This will do harm to the safe exploitation of mineral resources,the natural environment and people's life.With the continuous exploitation of coal resources,repeated mining is becoming more frequent.Repeated mining is another damage to the surface and rock strata disturbed by the first mining.Therefore,the movement and deformation of the surface will be more intense.At present,the domestic research on repeated mining is not mature enough.There are many problems to be solved.Therefore,the study of surface movement and deformation caused by repeated mining is great significance.In this paper,1111(3)working face in Zhu Ji Dong mine is taken as the research object,and combined with 1111(1)working face results and 1111(3)working face measured data.We completed the calculation of surface movement and deformation,the drawing of mobile deformation curve and the basic parameters calculated from measured data in the main section after stable surface movement.Based on the above calculation results and combined with geological and mining conditions,the rule of surface movement and deformation in repeated mining of 1111(3)working face is analyzed.The classical probability integral method is used to get the prediction parameters through the pattern method and the genetic algorithm.The prediction parameters of the 1111(3)working face are obtained by using the vector method and genetic algorithm,and the predicted values are obtained by the obtained parameters.The results show that the prediction accuracy of genetic algorithm is higher than that of modal vector method,and the accuracy of subsidence prediction is better than that of horizontal mobile,and the expected result of subsidence is better than the expected result of horizontal movement.It is found that the mobile basin has the edge convergence too fast.Therefore,an improved probability integral method is put forward in this paper,which makes the fitting accuracy of predicted value and measured value at the edge of basin higher.The predicted and predicted values of 1111(3)working face are calculated by improved genetic algorithm.The results show that the modified model solves the problem of excessive convergence of mobile basins,and the accuracy is improved.The research contents in this paper can be a reference for other similar conditions of surface movement prediction in mining area.