Stability Study On Underground Stopes Of A Mining Area

With the continuous development of society and economy of China,the production and demand of mineral resources are increasing.At present,the shallow part the mine which is the largest copper nickel sulfide mine in China has been basically mined,and the deep mining is in progress.In recent years,during the process of large-area continuous mining in the multi-middle sections of the mining area,the horizontal pillar in middle section of 1150 m has been fully recovered and the horizontal pillar in the middle section of 1000 m is being recovered.With the progress of mining,the 1000 m temporary horizontal pillar becomes thinner and thinner,and the stress accumulates constantly,which is easy to be destabilized and damaged,and even lead to serious accidents.Based on the investigation of data,geological background,mining process and future mining plan,the paper analyzes the whole mining process of mining area by FEA software.The yield of horizontal pillar of 1150 m and 1000 m is compared and studied.It is of great significance to the safety production of mining area to use the actual production experience of mining area to guide the mining work.Focusing on the stability of mining area,this paper mainly carried out the following research work:(1)The engineering research data and results related to the mining area are sorted out and studied,and the current mining conditions and mining scheme of the mining area are determined.(2)Through the comparison and selection of the main numerical FEA software,the main technical route,combining the pretreatment of ANSYS software and the advantage of nonlinear solution of ADINA software,is determined.Based on ANSYS APDL,the ANSYS to ADINA software preprocessing data conversion interface is developed,which realizes the complete conversion of pre-processing data.(3)Combined with the actual mining situation and the latest development of the mining area,the 3D finite element analysis model of mining area is established in the preprocessing module of ANSYS,and the pre-processing data is completely converted into ADINA software through data conversion interface.Based on the model,the whole process of mining in ADINA is simulated and analyzed,and the results are obtained.(4)The yield failure process of horizontal pillars of 1150 m and 1000 m middle section is analyzed and the stability of horizontal pillars in the middle section of 1000 m is analyzed and evaluated.Through analyzing and summarizing the yield failure law and stress change law of1150 m horizontal pillar,the stress change law of 1000 m horizontal pillar in each plate area during the mining process is studied,which provides the mechanical basis for the actual mining work of 1000 m horizontal pillar.(5)Two adjustment mining schemes are proposed for the future mining of 1000 m horizontal pillar in mining area.Based on the finite element model,the different whole mining processes of the adjustment schemes are both simulated,and the different influences of different mining sequences on stope stability are studied.The rules are summarized,and the recommended mining scheme is obtained through comparison analysis.