Analysis Of Surrounding Rock Stability In Deep Metal Mining Process Based On Microseismic Monitoring

As an extension in the deep mining,the mining process of surrounding rock stability has strong disturbance,easily induced disasters,that has brought a serious threat to the safety of underground personnel and equipment.Microseismic monitoring technology is a field of rock damage and technology,which can provide real-time monitoring of micro fracture evolution.The stability of stope has important significance through the analysis of microseismicity.This thesis takes 21 stope of Hongtoushan copper mine as the research background,by using the microseismic monitoring technology establish the microseismic monitoring system to study the law of microseismic activity in deep stope excavation disturbance.Through 3D goaf detection equipment of stope goaf three-dimensional shape tracking study deep stope mining microseismic activity regularity.Studying the dynamic evolution law of surrounding rock stress,strain and energy in the process of mining.To determine the potential instability region of the surrounding rock of the mining process,and to divide the stability of surrounding rock and the range of the surrounding rock.The main thesis contents and achievements of this paper are as follows:(1)Combined with the technical conditions of field mining,Through the establishment of 3D geological model and sensor arrangement plan in Hongtoushan 21 layout,we complete the construction of microseismic monitoring system rationally set up signal cable and the data transmission over telephone lines.(2)Study on the process of microseismic activity of deep mining in the mine,emphatically analyzed:microseismicity in the mining process of time and space distribution characteristics,nonlinear fitting with the Omori fusakichi law of microseismic activity time series,mining conditions of the quantitative characteristics of different influence on microseismic activity.disturbance in deep stope excavation,using varieious of seismic parameters,b value and energy release,to reflect damage evolution of internal rock mass in the course of exploitation.(3)Basing on Quantitative statistics of microseismic activity,studying stress,strain distribution and dynamic adjustment law surrounding rock under the influence of mining disturbance,combining with the actual delineation of potential instability in the region surrounding rock,to establish stope stress and strain risk body,based on the parameters of microseismology.study on the correlation between the parameters of mined out area and the risk of the stress and strain Divide contour of wall rock in mining process,grading and evaluating stability of rock.