Isolated Pillar Stability Analysis Of Deep Ore-body In A Gold Mine And Research Of Mining Effect

In the deep underground mining,the phenomenon is obvious about large area of the straight cavity caused by rock mass moving.While the isolation zone separated by a large number of continuous pillar or no ore belt,as for the support effect of isolation belt,that reduce the rock movement.If the barrier or pillar size and strength is not enough,roof rock caving may occur because of pillar under the heavy load in the late time.Theoretical analysis,field monitoring and numerical simulation technology has been applied in this article,tian-ma mountain sulfur gold-215 m phase of the isolated pillar were analyzed stability,The main research contents and conclusions were as follows:1?Apply the general situation of the engineering geological mining area,geological structure,strata,the mining characteristics of surrounding rock to make a brief evaluation.Synthesize stope layout parameters of deep ore-body level and related rock mechanics parameters to enrich the paper part of the theoretical analysis and numerical simulation data source.2?The cusp mutation theory combined with the engineering practice,By establishing the model and actual similar and using catastrophe theory and Yan Liang system instability of formation of the cusp catastrophic model to obtain the data and get judgment method for the robust stability of the system.It is concluded that the unstability of the pillar to provide a reference for actual production.3?Be incorporated in the paper content of the project,the displacement meter was adopted on pillar rock strata movement monitoring,ground penetrating radar?GPR?is used in the pillar caving condition monitoring.And Monitoring data is analysis to get some conclusions.4?Using FLAC^3D numerical simulation,combining with the maximum principal stress and minimum principal stress and the Z direction displacement and Y direction displacemen four indicators characterize ground pressure movement,according to analysis of the surface and the excavation roof strata mobile data,the span of the roof rock and the e MPty area exposed area increase gradually.Stress principal analysis shows that known in the process of ore mining,the excavation roof and floor rock mass stress to release gradually,the unstability of the mining area as a whole probability is small,and there is no further stress concentration phenomenon of excavation surrounding rock in mining.