Study on calculation sample and parameter selection of mine microseism signal b value

Wang Shuwen

doi:10.13199/j.cnki.cst.2016.12.009

Abstract：In order to improve the calculation efficiency and accuracy of the mine microseism signal b value,based on the actual microseism event occurred during the mine heading period of Mengcun Mine as the sample,a study was conducted on the sample,parameter selection and other problems related to the b value calculation process.In the different seismic occurred area,the nicroseism evolution mechanism and law would be different,the selection of the b value calculation sample should be the seismic occurred area as the base unit and the seismic occurred scope should be determined with the related microseism event distribution of the inner all seismic unit.Due to lack of the low seismic event,thus the b value calculation results would be highly reduced.The best initial seismic grade could be determined with the analysis on the related coefficient variation tendency.When the high level seismic grade was set up,the frequency rate distribution condition of the high seismic grade of the sample should be considered and the microseism frequency and the theoretical value related to the highest grade were quite same.In order to ensure the pushing process of the time windows,the total number of the neutral gear would not be changed.When the time window too short,the b value calculation results would be easily influenced by the random abnormal factor.But when the time window was too long,due to early historical data influence too high,the b value would be too low and the reparability on the time series would be poor.Related to the energy and frequency rate curve,the variation curve of the b value would be more stable and would have the sectional high (low) value zone.The prompt effect of the energy event would be better than the energy and frequency curves.