SEISMIC MONITORING AND ROCK BURST HAZARD ASSESSMENT IN DEEP POLISH COAL MINES-CASE STUDY OF ROCK BURST ON APRIL 16, 2008 IN WUJEK-SLASK COAL MINE
64 channel Seismic Observation System (SOS) was developed in GIG and installed in Wujek-Slask Mine in the Upper Silesian Basin - Poland. Also software for analysis of seismic events, especially for 3D location and passive tomography has been developed and integrated with SOS system. More than 2000 seismic events were recorded in the longwall panel 2Jd using SOS seismic network, and were used to study temporal changes of P-wave field velocity images, peak panicle velocity (PPV) values at the excavation boundary and seismic source parameters calculated in moving time windows.On April 16, 2008 rock burst damage of tunnels caused by the M=3, 3 seismic events took place. Very promising results were obtained studying changes of tomographic velocity images to determine seismic prone areas in panel 2JD in the Wujek-Slask mine. Just before rock burst, the zone of high velocity, high seismic anomaly and high gradient velocity has been observed very clearly near 2Jd gateroad. The P wave velocity increased in damaged area up to 20％. The passive tomographic velocity images turned out to be very useful as long-term precursors of seismic prone areas.The second useful precursor was the distribution of peak particle velocity parameter (PPV) at the boundary of excavations in working area. The PPV was calculated using the empirical relationships developed for coal mines in Poland:log (PPV-R) = 0,66 log M0 - 7,4 (Mutke 2008). The calculated peak particle velocity (PPV) in the damaged 1Jd gateroad, reached value from 0,35 m/s to 0,6 m/s. The M=3,3 rock burst damaged 85 m of gateroad No. 1Jd.The seismic source parameters calculated in moving time windows were studied before rock burst event in 2Jd longwall panel. One has observed that just before strong seismic event stress drop, seismic moment and seismic energy increased significantly and was useful mid-term precursors to estimate potential seismic hazard.
G.MUTKE A.LURKA J.DUBINSKI
Central Mining Institute, 40-166 Katowice, Plac Gwarkow 1, Poland
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
1413-1424
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）