Probable Effect of Secondary Subsidence of Main Roof on Outburst Hazard in Coal Beds under Decomposition of Gas Hydrates
V. V. DYRDIN1, V. N. OPARIN2, A. A. FOFANOV1, V. G. SMIRNOV1, T. L. KIM1
1Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
2Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: газодинамические явления, вторичные осадки, зона дезинтеграции, "газовый мешок", газогидраты метана, выбросоопасность, низкочастотные колебания, температура, давление, моделирование, gas-dynamic events, secondary subsidence, disintegration zone, gas pocket, methane gas hydrates, outburst hazard, low-frequency vibrations, temperature, pressure, modeling
Abstract
The article presents physical modeling of geomechanical processes in outer zones of coal beds with the main roof caveable with difficulty. The scope of the modeling embrace the effect exerted on gas release by gas temperature and pressure variation during stage-wise outlet of gas from a pressure bomb, which simulates cyclical mechanical impact on a coal bed in the zones of a gas pocket. It is found that the low-frequency (2.0-4.5 Hz) attenuating vibrations generated in the main roof can induce both secondary rock mass disintegration as well as methane desorption and decomposition of gas hydrates (if present) accompanied by an increases in gas pressure and in number of gas-dynamic events in outer zones of coal beds.
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