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Evolution of Cracks at the Edge of a Gas-Bearing Coal Seam under Stationary Mining

Author:
Feldman, E. P.  Kalugina, N. A.  Chesnokova, O. V.  


Journal:
JOURNAL OF APPLIED MECHANICS AND TECHNICAL PHYSICS


Issue Date:
2019


Abstract(summary):

In this paper, we consider the conditions under which the gas enclosed in a main crack located at the edge of a coal or rock formation can produce fracture of the formation. Kinetic theory is developed for two competing physical processes: formation unloading due to rock pressure and gas filtration from the crack cavity into the surrounding rock. The first process promotes fracture, and the second leads to a decrease in the gas pressure causing the fracture. The evolution of the crack is determined by the ratio of the rates of these processes. It is found that a modified Griffith's criterion is a necessary but not sufficient condition for fracture. For formation fracturing, it is also necessary that the ratio of the unloading rate to the filtration rate exceed a certain threshold value.


Page:
560---568


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