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Study on coal adsorption-permeability model under the coupling of temperature and pore pressure
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| LI Bobo1，2，3，GAO Zheng1，YANG Kang1，LI Jianhua1，REN Chonghong1，XU Jiang4，CAO Jie4#br# |
(1. College of Mining，Guizhou University，Guiyang，Guizhou 550025，China；2. National Local Joint Engineering Laboratory for Efficient Utilization of Dominant Mineral Resources in Karst Mountain Area，Guizhou University，Guiyang，Guizhou 550025，China；3. Ministry of Mine Disaster Prevention and Control to Build a National Key Laboratory Cultivation Base，Shandong University
of Science and Technology，Qingdao，Shandong 266590，China；4. State Key Laboratory of Coal Mine Disaster
Dynamics and Control，Chongqing University，Chongqing 400044，China)
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Abstract In order to simulate the influence of temperature and pore pressure on the adsorption and permeability characteristics of coal during gas drainage，the isothermal adsorption experiments and the seepage tests in the gas reduce process under different temperatures were carried out respectively by using the isothermal adsorption device and the triaxial servo-controlled seepage equipment for the thermo-fluid-solid coupling of coal containing methane. A modified dual-site L adsorption model was established，and on this basis，a coal permeability model considering the coupling effect of temperature and pore pressure was proposed. The rationality of the new permeability model was verified by test results. The results show that，under the experimental conditions，the cumulative desorption of gas increases with decreasing the gas pressure. The permeability of coal decreases first and then increases with decreasing the pore pressure under a constant temperature. With rising the temperature，the permeability of coal decreases first and then increases under a constant pore pressure. The modified dual-site L adsorption model has better fitting effect than the original model，and can well reflect the relationship between the adsorption capacity of coal and the gas pressure at different temperatures. In the process of gas desorption in coal，the contraction strain of the matrix increases with decreasing the pore pressure. The new permeability model has a good consistency with the test data and can better represent the permeability evolution law under different temperatures.
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2020, Vol. 39 
