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THERMAL SCIENCE
International Scientific Journal
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COUPLING EFFECTS OF SHOCK WAVE FREQUENCY AND ENERGY ON CRACK PROPAGATION IN COAL-ROCK MASSES BY
ABSTRACT
Controllable shock wave technology improves coal seam permeability by weakening the strength of coal-rock mass and expanding fractures, but the coupling mechanism of frequency and energy on crack propagation remains unclear. In this study, FLAC3D was used to simulate the effects of shock waves with different frequencies (100 Hz, 500 Hz, 1000 Hz) and peak pressures (1 MPa, 5 MPa, 10 MPa) on crack propagation in coal-rock mass. The results show that the influence of frequency on plastic zone volume is non-linear, with the largest volume at 500 Hz; peak pressure exhibits a linear effect, and when the pressure is 10 MPa, the plastic zone accounts for 84% of the total volume, forming an optimal crack network. The displacement field shows that the maximum z-direction displacement in the top loading area is 0.008 m, driving crack expansion; the stress concentration area highly coincides with the plastic zone, verifying the mechanical mechanism. The study determines that the optimal parameter combination is 500 Hz and 10 MPa, providing a theoretical basis for shock wave parameter optimization and efficient coalbed methane extraction.
KEYWORDS
PAPER SUBMITTED: 2025-06-20
PAPER REVISED: 2025-09-08
PAPER ACCEPTED: 2025-09-17
PUBLISHED ONLINE: 2026-07-18
DOI REFERENCE: https://doi.org/10.2298/TSCI250620112Z
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© 2026 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International licence