Comprehensive early warning of rock burst utilizing microseismic multi-parameter indices

摘要

Rock bursts have become one of the most severe risks in underground coal mining and its early warning is an important component in the safety management.Microseismic(MS)monitoring is considered potentially as a powerful tool for the early warning of rock burst.In this study,an MS multi-parameter index system was established and the critical values of each index were estimated based on the normalized multi-information warning model of coal-rock dynamic failure.This index system includes bursting strain energy(BSE)index,time-space-magnitude independent information(TSMII)indices and timespace-magnitude compound information(TSMCI)indices.On the basis of this multi-parameter index system,a comprehensive analysis was conducted via introducing the R-value scoring method to calculate the weights of each index.To calibrate the multi-parameter index system and the associated comprehensive analysis,the weights of each index were first confirmed using historical MS data occurred in LW 402102 of Hujiahe Coal Mine(China)over a period of four months.This calibrated comprehensive analysis of MS multi-parameter index system was then applied to pre-warn the occurrence of a subsequent rock burst incident in LW 402103.The results demonstrate that this multi-parameter index system combined with the comprehensive analysis are capable of quantitatively pre-warning rock burst risk.