Optimization Of Mining Methods And Optimization Of Stope Structure Parameters In Muyang Lead Mine

The optimization of the mining method is a multi-objective,multi-factor nonlinear system engineering.Reasonable mining methods are the prerequisite for safe production and maximum recovery of resources in mines.On the premise of ensuring safe production,the optimal stope structure parameters can also further increase the recovery rate and ensure the stability of the goaf.This article takes the mining of steeply inclined thin ore bodies in Muyang lead mine as the research background,in order to solve many technical problems faced in mining steeply inclined thin ore bodies.In view of the difficulty of selecting mining methods and the incomplete consideration of factors,a more scientific and comprehensive game theory-combined weighting comprehensive evaluation model was established to optimize mining methods.Aiming at the problems of complex and diverse indicators in the evaluation of stope structure parameter schemes and low prediction accuracy,the evaluation model is used to optimize its stope structure parameters.Numerical simulation software is used to analyze the stope stability of each stope structure parameter scheme,and the simulation results verify the scientificity and practicability of the game theory-combined weighting comprehensive evaluation model.The main research conclusions are as follows:(1)On-site sampling analysis and structural surface investigation,processing samples and conducting indoor mechanical tests to obtain rock mechanical parameters.(2)The J?v value of the volume joint number of the rock mass is used to characterize the integrity of the rock mass,and the J?c value of the structural surface condition factor value is used to characterize the structural surface conditions,and the two are used to quantify the GSI value.Using the volume joint number J?v and the GSI estimation method of the uniaxial compressive strength of the rock,the GSI value is calculated through the test data.The two verified each other and proposed a method to modify the GSI value.(3)According to the geological and hydrological characteristics of the mining area,the rock mechanics parameters of the ore rock mass and relevant expert recommendations,three mining methods are initially selected.Consider many factors and establish a more scientific evaluation index system.A combination weighting method based on analytic hierarchy process and entropy weight method is proposed,and the two-party weights optimized by game theory are used to construct a game theory-combined weighting comprehensive evaluation model.Finally,the TOPSIS evaluation method is used to select the optimal mining method.(4)Analyze and calculate stope structure parameters using the roof four-side fixedsupport mechanical model and roof four-side simple support mechanical model.Three stope structure parameter schemes are initially selected,and the game theory-combined weighting comprehensive evaluation model established in this paper is used to carry out the schemes.Preferably,the optimal stope structure parameter scheme is selected,and the FLAC3 D software is used to simulate and analyze each scheme,and the simulation results and evaluation results are mutually verified.Determine the optimal stope structure parameter scheme.The research shows that the evaluation model can select the optimal mining method and stope structure parameters in the multi-factor,multi-objective and other complex evaluation indicators during the optimization of mining methods and stope structure parameters.The research results are very useful for similar mines.Method optimization and stope structure parameter optimization have important reference value.