MODELING EFFECTS OF GRAVITY ON GAS DRAINAGE IN METHANE-CONTAINING COAL SEAMS
M. V. Kurlenya1, K. Kh. Lee2, V. G. Kazantsev3, U Li H.2, V. S. Zykov2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Scientific Center VostNII, Kemerovo, Russia
3Federal Research and Production Center ALTAI, Biysk, Russia
Keywords: Modeling, coal, seam, gas drainage, flow, pressure in sorption, stress state
Abstract
The apparatus of nonstationary thermoelasticity is used to estimate the joint and separate effects of gas pressure sorption and gravity on gas drainage and on stress state in the vicinity of underground openings. It is shown that gas flow changes the stress state of coal, and pressure in sorption essentially counteracts pressure in gravity. Ignorance of the latter fact may lead to a poorly substantiated choice of a coal gas drainage technology and to an erroneous prediction of rock strength and stability.
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