Effect of Temperature on Gas Permeability of Stressed Coal.

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  • 封圧炭のガス透過性に対する温度効果
  • フウアツタン ノ ガス トウカセイ ニ タイスル オンド コウカ

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Abstract

At the deeper coal mines in Hokkaido, Japan, the coal of working faces became hard frequently prior to coal outbursts and the gas concentration decreased unusually. In order to make clear the above phenomena the effects of temperature on strain hardening and gas permeability of stressed coal were investigated experimentally and theoretically in this study. Practically, the applicability of WLF equation to the effects of temperature and stress on creep strain rate were considered on the basis of the results of creep tests of confined coal. From this consideration it was proved that the reducibility existed between the effect of temperature and that of stress. Furthermore, creep strain and gas permeability of coal were expressed as a function of the effective stress compensated by adding the reduced stress of the effect of temperature to the applied stress. As these results, creep strain and gas permeability of coal increased and decreased rapidly under the depth of 500 m. The effects of earth temperature on strain hardening and gas permeability of stressed coal gave a reasonable explanation to the reason of frequent occurrence of coal outbursts at the mining of deep level coal seams.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 114 (3), 175-182, 1998

    The Mining and Materials Processing Institute of Japan

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