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| Meso-mechanism of permeability decrease or fluctuation of coal and rock with the temperature increase |
| XIE Jianlin1，2，ZHAO Yangsheng1 |
| (1. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. College of Enviroment and Safety，Tailyuan University of Science and Technology，Taiyuan，Shanxi 030024，China) |
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Abstract The meso-structure evolution of coal and granite samples at normal temperature to 350 ℃ was studied by means of on-line heating and synchronous observation. Under the same conditions，the sub meshes with solid particles and pure pores are affected by the temperature more obviously，and the pores are larger. As these pores are throats of porous media，the change of their sizes have a significant effect on the permeability of coal and rock. The permeability of granite and most of the meager coal samples increase first and then decrease with the increase of temperature，while a few meager coal samples show a monotone downward trend. The smaller the coal porosity is，the lower the critical temperature of porosity decreasing.
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2017, Vol. 36 
