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| Permeability of mine gas hydrate bonded coal against loading-unloading
of axial stress |
| ZHANG Baoyong1，YU Yang1，GAO Xia2，WU Qiang1，ZHANG Xuhui3，ZHANG Qiang1，LI Huanru1 |
| (1. School of Safety Engineering，Heilongjiang University of Science and Technology，Harbin，Heilongjiang 150022，China；
2. School of Architecture and Civil Engineering，Heilongjiang University of Science and Technology，Harbin，Heilongjiang 150022，China；3. Institute of Mechanics，Chinese Academy of Sciences，Beijing 100190，China) |
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Abstract Key issues still remain in revealing the effect of hydrate formation on coal permeability，as well as the permeability variation subjected to mining exploitation，concerning to the application of the hydrate method. Using steady-state method based on outlet flow，the permeability tests of gas-bearing coal(three water contents and three particle sizes) and subsequently the tests of mine gas hydrate bonded coal for against loading-unloading of axial stresses were conducted，by triaxial testing machine for coupled seepage，chemical and triaxial stress measurements in mine gas hydrate bonded coal. Then，the rule and mechanism are revealed relating to the effect of hydrate formation，effective stress and hydrate saturation on coal permeability. The results show that the coal permeability decreases after hydrate formation by a reduction between 79% and 99%. The permeability varies exponentially with the effective stress under loading-unloading of axial stresses. The variation of the permeability under unloading can be divided into three patterns，including a small amount of permeability recovery，partial permeability recovery and permeability increase. In the process of loading-unloading of axial stress，the permeability loss rate and damage rate increase with the growth in the hydrate saturation for mine gas hydrate bonded coal. As a result，the formation of gas hydrate blocks the coal penetration channel and restricts the coal mine gas migration，which makes it a possible solution to shortening the construction period of rock cross- cut coal，accompanied by gas pressure decrease in a short time.
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2022, Vol. 41 
