Research On The Stability Analysis And Control Measures Of The Old Goafs In The Multi-level Underground Mine

In recent years, with the rapid development of the economy, the demand for the amount of resources is increasing, and the total mining of domestic metal mines and nonmetal mines is also increasing, many mines face the difficulty of goafs management. Especially the old mines from the last century, the goafs processing is imminent. Currently, for the stability analysis of the goaf, there is mostly just single numerical analysis or theoretical analysis, not effectively combining these two methods to comprehensively analyze and discuss the stability of the goafs and get more accurate results.Based on the current situation of Xinjiang Jintan Gold Mine and rock mechanics parameters which is determined by triaxial tests, this paper combines theoretical analysis with numerical simulation analysis method to analyze the three major orebody’s goafs of the mining area, then synthesize the results of two analysis methods, find out the most dangerous area of the goafs, and put forward the processing scheme.In the theoretical analysis part, Mathews stability graph which has been corrected would been used to analyze the stability of each mining level’s goafs by the detailed survey of the modes of ore occurrence, rock quality designation, the development of joint fissure, the shape and size of the goafs. In the numerical simulation, stability analysis of the goafs is performed by widely applied finite element analysis software ANSYS, through analyzing the displacement, stress, elastic strain along the ore body trend, X-axis, Z-axis nephogram, and the data of displacement and stress change of the roof and pillar’s keypoint after mining and analyze the stability of each mining level goafs.Finally, by synthesizing the results of the above two analysis methods, point out the key goafs in the mining district and take measures to fill in the key goafs. Then according to the actual conditions of the mine, propose a feasible stowing method and make a theoretical demonstration for the stowing result to provide reference for mining production in the future.