Characteristics of mining tremors within the near-wave field zone |
| |
| Authors: | Józef Dubiński Grzegorz Mutke |
| |
| Institution: | (1) Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland |
| |
| Abstract: | Mining in the Upper Silesian Coal Basin, Poland, induces tremors with magnitudes ranging up to 4.3. The recordings of mining tremors from the near-wave fiel and the far-wave field show different characteristics of ground motion.Knowledge of these characrteristics, has an enormous practical importance when solving the problems of resistance of underground workings against seismic impacts. The near-wave field is characterized by a domination of the high frequency components of motion, and the seismograms often are a single pulse Geomechanical interpretation of them leads to the conclusion that this pulse corresponds to a single exciting force. This fact is also reflected in the rockbursts: the potentially damaging ground motion which is restricted to the seismic source region.The seismometric data have shown that the peak particle velocities from a hypocentral distance of 200–300 m, resulted in more than 3 cm/s. The peak ground velocities appear to be dependent on stress drop   , and peak particle velocities reaching 5 m/s may occur. The computational example proves that in a thick coal seam the pulse with the stress =1.8 MPa from the tremor at the short source distance can generate the rockburst. |
| |
| Keywords: | Mining tremors rockburst near-wave field peak particle velocity dynamic load |
| 本文献已被 SpringerLink 等数据库收录！ |
|
