Research Of Microseismic Monitoring Technology And Application On Shallow Gob Stability

Many of our metal and nonmetallic mines exist in a large number of untreated gob,for this,the surrounding rock stress environment was complexed and the mine mining conditions was deteriorated.Under the continued impact of blasting vibration,it is easy to trigger the gob deformation,instability or even breakage,and it also has a serious impact of mine production and safety management.As a result of the collapse of gob has caused many security incidents,the gob has gradually become one of the most important hazards affecting the safe production of metal and nonmetallic mines.Microseismic monitoring technology can effectively predict the deformation and failure modes and range of the surrounding rock in the time and space,which it has been widely used in mine power disaster early warning and forecast,and develop gradually in practice.According to the characteristics of stress deformation of surrounding rock in shallow gob,the paper regards the shallow as the research object,based on the three researches of the stability of shallow gob by our group under different background conditions,carrying out the following aspects of research works:(1)Research on Optimization of Microseismic Monitoring System Arrangement and Positioning Accuracy.Based on the monitoring objectives under three different background conditions,different monitoring schemes were developed respectively.The error distribution of the target area was simulated by the expected precision inversion;The positioning parameters were further optimized by means of artificial blasting,and the appropriate velocity model was determined to achieve the optimal positioning effect.(2)Research on Monitoring and Forecasting of Illegal Mining Activities.The TISCO Yuan Jiacun iron mine south of Nian Gou microseismic monitoring project was took as the research background.Based on statistical principles,the time frequency and spatial distribution evolution rule of effective monitoring data was analyzed,the position of transboundary mining activities was confirmed,and the activity patterns was found out,Finally the evidence was provided to fight against the illegal mining activities for mine.(3)Research on Microseismic Monitoring of Shallow Gob Stability from Underground Mine The Pan Luo iron mine microseismic monitoring project was took as the research background.the relationship between mine production activity and microseismic activity was quantitatively analyzed.Minewhile,the microseismic activity pattern,temporal and spatial distribution characteristics was summarized,it was to ensure product efficiently.(4)Research on Microseismic Monitoring of Shallow Gob Stability from Open Pit Mine.The Da Baoshan mine microseismic monitoring project was took as the research background.Two concept about “the ratio of energy index and cumulative apparent volume(EIE)” and “the ratio of Schmidt number and cumulative apparent volume(sScE)was put forward,and it was regard as an indicator of rock mass stability prediction.Meanwhile,the author used B value and number of events.Based on the three sets of parameters,the general model of the monitoring and forecasting of the stability of the shallow gob was established,Finally,it was verified in gob large landslip.(5)Research on the Time Evolution Rule of Fractal Dimension of Microseismic Information in Shallow Gob Landslip.Based on fractal theory,the microseismic monitoring data from Da Baoshan mine was used to calculate fractal dimension of time,space,and energy.Time evolution rule of fractal dimension of microseismic information was expressed when the rock mass was destabilized,at the same time,fractal properties of microseismic parameters of mined rock destruction was put forward.