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Abstract Based on self-developed triaxial servo-controlled seepage equipment for hot-fluid-solid coupling of coal containing methane，permeability of coal sample after injected of CH4 or CO2 under different effective confining pressures and pore pressures is determined，in order to research the response law of the permeability to pore pressure. The results show as follows：(1) At the low pore pressure，the permeability decreases when the pore pressure increases；and its evolution can be divided into accelerating change stage and stable change stage；(2) The permeability of coal when filling CO2 is lower than that when filling CH4 at the same effective confining pressure and pore pressure. (3) Using the parameters，change rate of permeability Dp and the sensitiveness coefficient of pore pressure Cp to evaluate the pore pressure-sensitive，which indicates that the responsiveness of permeability to pore pressure is significant when the pore pressure is less than 1.0 MPa. Then based on the Cp，the functional relationship between permeability of coal and pore pressure is derived.
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Received: 29 June 2012
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2013, Vol. 32 
