EXPERIMENTAL RESEARCH ON RESPONSE LAW OF PERMEABILITY OF COAL TO PORE PRESSURE
XU Jiang1，2，CAO Jie 1，2，LI Bobo1，2，ZHOU Ting 1，2，LI Minghui1，2，LIU Dong1，2
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China；
2. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，Chongqing 400044，China)
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.
许 江1，2，曹 偈1，2，李波波1，2，周 婷1，2，李铭辉1，2，刘 东1，2. 煤岩渗透率对孔隙压力变化响应规律的试验研究[J]. 岩石力学与工程学报, 2013, 32(2): 225-230.
XU Jiang1，2，CAO Jie 1，2，LI Bobo1，2，ZHOU Ting 1，2，LI Minghui1，2，LIU Dong1，2. EXPERIMENTAL RESEARCH ON RESPONSE LAW OF PERMEABILITY OF COAL TO PORE PRESSURE. , 2013, 32(2): 225-230.
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2013, Vol. 32 
