Stability Analysis And Treatment Of Goaf In Dongfanghong Ore Section Of Yinnachang Iron-copper Mine

With the acceleration of the social process,the consumption of mineral resources is also increasing day by day.The ore is mined,and the mining activity destroys the original ground stress balance and redistributes the stress around the mined-out area.In this process,if the redistributed stress exceeds the limit that the surrounding rock can withstand,the mined-out area will be It will fall or even collapse,which is a huge threat to mine safety.This article takes the goaf of Dongfanghong mine section of Yinnachang Iron and Copper Mine in Wuding County as the research object.Due to the long mining life of this mine,the mined area formed by mining has not yet been effectively controlled.The existence of the goaf is important to the mine.It is always a hidden safety hazard.Therefore,it is urgent to analyze the stability of the mined-out area and formulate an economic and effective treatment plan to protect the safe production of the mine.Aiming at the current situation of the goaf in the Dongfanghong mine section of the Yinnachang Iron and Copper Mine,the stability of the goaf of the mine section and its hazards to the surface are analyzed.This article mainly conducts research from the following aspects:(1)Through on-site investigation of the mined-out area,the relevant data was collected and sorted out.The survey results showed that the mined-out area left by the mine section has a long life.The whole goaf is currently in a stable state,however,there are still mining activities in the lower part of the goaf,and the stability of the goaf will be disturbed.(2)Through the game theory-cloud model goaf stability discrimination model and the cusp catastrophe theory to analyze and discuss the stability of the goaf from multiple angles,and finally through the game theory-cloud model goaf stability discrimination model The analysis shows that the five mined-out areas in the mining section are in a basically stable state;the cusp catastrophe theory calculates that the roof-pillar system of the mined-out area is in a stable state,indicating that the goaf is in a safe state..(3)Combining the results of discriminant model analysis,theoretical calculation,and numerical simulation,the analysis shows that when the ore body is removed,the maximum settlement of the surface of the goaf is about 6 mm,which has little impact on the surface.In a stable state.This article puts forward three methods of comprehensive treatment using caving surrounding rock treatment goaf,existing pillar-supported goaf and isolated closed goaf,and puts forward an economical and effective goaf treatment plan for the mine.(4)Combining the results of discriminant model analysis,theoretical calculation,and numerical simulation,the analysis shows that when the ore body is mined,the maximum subsidence of the surface of the goaf is about 6 mm,which has little impact on the surface.In a stable state.However,there is a risk of caving in the goaf for a long time.This article analyzes the possible hazards of caving in the goaf,and proposes the use of caving surrounding rock to treat the goaf,the existing pillar supporting the goaf,and the isolation and sealing of the goaf.The three methods of comprehensive management in the area have proposed an economical and effective goaf management plan for the mine.