Engineering Mechanics

Proceedings Vol. 25 (2019)

ENGINEERING MECHANICS 2019

Copyright © 2019 Institute of Thermomechanics of the Czech Academy of Sciences, Prague

 

Pavlenko M., Barnov N.:
pages 271 - 274, full text

The methane extraction from the coal massif is needed due to preparatory and treatment works before starting the mining. The amount of natural methane extraction is very low and deceases with the coal seams depth. Therefore, the goal of this article is to analyze the influence of the vibration impact on lowpermeable gas-bearing coal massifs by means of creating new crack systems. The vibration treatment of the coal seam consists in inducing vibration of the gas-saturated mass, which arrives at the crack formation and the flow of methane from the reservoir to the well. The wave equations with a double periodicity are presented here. They make it possible to determine displacements of microcracks on the coal block surfaces. The process of forming the crack arrays is most efficient if the excitation frequency is equal to the resonance one of the coal seam. On these conditions the growth of cracks and their number is significant and contributes to the intensification of the methane disloging from the coal seam.

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