Seepage evolution in coal creep under different temperatures and different stresses
CAI Tingting1，2，FENG Zengchao1，2，JIANG Yulong2，3，ZHAO Dong2，3，ZHOU Dong2，3，ZHANG Xiaoqiang3
(1. Institute of Mining Technology，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Key Laboratory of In-situ Property-improving Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；3. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China)
Coal permeability is the key factordetermining the effectiveness of coal-bed methane(CBM) exploitation. In the CBM production cycle，the long-term high temperature and stress make the seepage paths in coal evolve with time.In this paper，the seepageevolution in coal creep under different temperatures and different stresses were studied，and the results shown that the creep of coal undergoes three phases：the hardening phase before the creep start stress threshold，the creep phase with compressive volume deformation and the creep phase with expanding volume deformation. In the whole process，the permeability of coal gradually decreases and then increases with the creep strains and there is a good consistency between thepermeability evolution and time-dependent volumetric strain.The increasing temperature is helpful for the occurrence of coal creep strain，resulting in the decrease of the creep start stress threshold and the ultimate failure strength. At high temperature，the creep of coal shows a greater influence on the decrease of permeability，and the maximum loss of coal permeability can reach 40.35%.The results can provide theoretical support for the effective exploitation of CBM.
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CAI Tingting1，2，FENG Zengchao1，2，JIANG Yulong2，3，ZHAO Dong2，3，ZHOU Dong2，3，ZHANG Xiaoqiang3. Seepage evolution in coal creep under different temperatures and different stresses. , 2018, 37(S2): 3898-3904.
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2018, Vol. 37 
