Study on Source Fine Location and Spatial-Temporal Evolution Law of Stope in Jinchuan No.2 Mining Area
Aiming at the problems of microseismic signals being easily affected by mechanical vibration,rock fragmentation and other interference signals,and having complex wave forms and poor positioning accuracy in complex underground production environments,the WSA(Wavelet STA/LTA-AIC picker)method,which was an automatic arrival time pickup method,was proposed.In this method,discrete wavelet transform(DWT),long short time window mean ratio method(STA/LTA),and Akaike information criterion(AIC)were used combined with the characteristic information of P-wave arrival time and frequency domains,so as to obtain accurate P-wave arrival time.30 sets of manually triggered impact events were carried out in Jinchuan No.2 mining area for fine positioning verification of the mining source.The results show that compared with other arrival time pickup methods,the WSA method has the smallest average positioning error and standard deviation,with 12.58 m and 12.25 m,respectively.It has a better accuracy and robustness,and can provide more accurate and reliable positioning results for complex mining environments.The WSA method was used to locate microseismic events in this mining area,and it was concluded that the distribution of seismic sources and explosion events exhibit spatial-temporal correlation,and the seismic sources are also concentrated in the non blasting area of the filling roof.
Source fine locationArrival time pickupSpatial-temporal evolutionMicroseismic monitoringComplex mining environment
万方数据
维普
