E3S Web Conf.
Volume 133, 2019AG 2019 – 5th International Conference on Applied Geophysics
|Number of page(s)||10|
|Section||Application of Geophysical Methods|
|Published online||25 November 2019|
Reference P-wave velocity in coal seams at great depths in Jastrzebie coal mine
1 Mineral and Energy Economy Research Institute of the Polish Academy of Sciences, Cracow, Poland
2 JSW S.A. KWK “Budryk”, Ornontowice, Poland
3 Cracow University of Technology, Cracow, Poland
* Corresponding author: email@example.com
In the study, the determining of the reference velocity of the P-wave in coal seams used in seismic profiling to assess increases and decreases in relative stresses at large depths has been presented. The seismic profiling method proposed by Dubinski in 1989 covers a range of depth up to 970 m. At present, coal seams exploitation in Polish coal mines is conducted at greater depths, even exceeding 1200 m, which creates the necessity for a new reference velocity model. The study presents an empirical mathematical model of the change of the P-wave velocity in coal seams in the geological conditions of the Jastrzebie coal mine. A power model analogous to the Dubinski’s one was elaborated with new constants. The calculations included the results from 35 measurements of seismic profiling carried out in various coal seams of the Jastrzebie mine at depths from 640 to 1200 m. The results obtained cause changes in the result of calculations of seismic anomalies. Future validation of the proposed model with larger data set will be required.
Key words: rock burst hazard / Dubinski method / seismic profiling / refracted P-wave
© The Authors, published by EDP Sciences, 2019
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