轴向应力循环加卸载作用下含瓦斯煤渗透性研究

doi:10.13722/j.cnki.jrme.2015.1543

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Abstract In order to investigate the response of tectonic coal to cyclic loading-unloading of axial stresses，experimental study and analysis of dynamic model of permeability were carried out with experiment facility developed in-house for triaxial seepage test considering the fluid-solid-heat coupling in gas filled coal. The results show that the relation between the permeability of gas filled coal and the strain presents a trend of inclined letter ‘V’. The permeability of tectonic coal samples increases obviously after peak strength and the growth rate is greater than the reduction rate of permeability in the initial stage of compression. The permeability of coal samples and the axial stress presented a relation of negative exponential function during unloading. The permeability decreases under loading and recoveres a bit under unloading. The permeability and the effective stress does not form a closed curve. The reduction of permeability increases and the sensitivity of permeability to the effective stress decreases because that pores of coal sample are more compressed under cyclic loading- unloading. A factor in reduction of permeability sensitivity when loading and another factor in reduction of permeability when unloading were introduced，and then the dynamic evolution model of permeability and effective stress under cyclic loading-unloading was established. The comparison of experimental data with theoretical results verified the applicability of this model.

Key words： mining engineering tectonic coal cyclic loading-unloading permeability dynamic model effective stress

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	Articles by authors
	SUN Guangzhong1
	2
	3
	JING Yongbin2
	3
	ZHANG Ruilin2
	3
	WANG Liguan1

Cite this article:

SUN Guangzhong1,2,3, et al. Permeability of coal samples containing methane under cyclic loading-unloading of axial stresses[J]. , 2016, 35(5): 928-938.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1543 OR http://www.rockmech.org/EN/Y2016/V35/I5/928

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