Dynamic Fracture of Gas-Bearing Coal Seam during Zonal Disintegration
V. N. Odintsev1, V. V. Makarov2
1Academician Melnikov Research Institute for Comprehensive Exploitation of Mineral Resources, Moscow, Russia 2Far Eastern Federal University, Vladivostok, Russia
Keywords: coal seam, zonal disintegration, tensile fractures, methane diffusion, gas pressure, blower, sloughing
Abstract
The study focuses on the theory of zonal disintegration in gas-bearing coal seams and gas-dynamic phenomena in underground structures. The concept of unstable geomechanical behavior of coal seams is conditioned by instability of deformation during micro-cracking and macro-cracking. In the zone of disintegration in a gas-bearing coal seam, occluded methane releases from coal substance. As a result of increasing pressure of free methane, a zone of damaged coal and gas appears deep in the coal seam and can induce such gas-dynamic events as blower, sloughing and outbursting. The obtained values and relations of geomechanical and gas-dynamic parameters agree with the actual practice data.
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