Structural Parameter Optimization And Stability Analysis Of The Stope Of Huanian Iron Mine, Eshan, Yunnan

The stability of underground stope is one of the key issues that mining enterprises can not ignore in the process of safe and efficient production.Statistical analysis of the causes of many mine safety accidents is available.The safety and stability of underground mining sites is the prerequisite for ensuring underground continuous mining.Strengthening the research on the optimization theory of the structure parameters of the stope also plays an important role in ensuring the stability of the stope.The reasonableness of the structural parameters of the stope is the basis for the safety and stability of the mining stope and the economic benefits.By rationally optimizing the dimensions of the stope structure and other factors,the stress and strain changes of the surrounding rock of the roof and the pillar are more uniform during the mining process,and the instability of the stope is reduced.Through reasonable parameter optimization,the waste of mineral resources and support,the amount of cutting and cutting engineering,the mining intensity,the production efficiency and the recovery rate of mineral resources are effectively reduced due to the unreasonable design of the structural parameters of the stope.This paper takes the segmental empty-field mining method selected from the 61205 mining site in the middle section of Huanian Iron Mine as the research object,and combines the actual conditions of the ore body occurrence,mining process and stope parameters of the iron ore,and adopts the theoretical analysis method.The reasonable value of each element in the stope is theoretically calculated,and the comprehensive evaluation system of entropy weight ideal point is established to optimize the structure parameters of the stope.Combined with the computer numerical simulation method,the optimization scheme of the stope structure parameters is verified.Excellent stope structure parameter scheme.The main research contents are as follows:(1)Combined with the statistical results of the mine site investigation,the theoretical analysis method is used to analyze the stability of the pillar and the roof;the top pillar of the stope,the limit span of the roof and the pillar are theoretically calculated separately.According to the reasonable value range of the thickness of the top column,the span of the mine,and the width of the column.(2)Taking the safety factor of the pillar as the evaluation index,the orthogonal design experiment is used to coMPare the ability of the six elements to affect the stability of the pillar.The pillar width(0.93),buried depth(0.73)and mine span are obtained.0.65)has the most significant iMPact on pillar stability(3)Select evaluation indicators from three aspects of technology,safety and economy,and establish a comprehensive evaluation system of entropy weight ideal points,and evaluate andoptimize the selected four groups of optimization plans.Finally,by coMParing the closeness of each program,the closestness of the third option is 71.4%.(4)Using MIDAS to establish the calculation model of the stope and field of each stope structure parameter scheme,and then import FLAC3 D to assign values to each group of materials and carry out simulation mining research;for each scheme,the stress distribution of surrounding rock in stope mining after mining in each stope The displacement of the key points of the top and bottom plates and the distribution of the plastic zone during the mining of different mining houses were coMPared and analyzed.By coMParing the structural parameters of different stope structures,the plastic zone volume and penetration of the surrounding rock after excavation of the stope were adopted.Stability is judged.Combined with the theory of rock strength and the allowable displacement of key points,the stress and displacement distributions of the rock mass in the stope are coMPared,and whether the ultimate bearing capacity and limit tolerance of the rock mass are exceeded,and the stope of different schemes is adopted.The stability is judged and verified with the optimization result of the entropy weight ideal point method.Finally,the third scheme is the optimal scheme.