循环加卸载作用下不同高度煤样渗透性试验研究

doi:10.13722/j.cnki.jrme.2018.0687

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Abstract In order to obtain the permeability variations of coal samples with different heights under cyclic loading，triaxial loading seepage experiment device was used to carry out the cyclic axial loading and unloading compression tests on coal samples with the same diameter and different heights. The results show that the permeability decreases with the increasing of the axial compression in the loading stage. The permeability increases with the decreasing of the axial compression in the unloading stage. The relationship between the permeability and the axial compression is a negative exponential function and the stress sensitivity of permeability decreases with the increasing of cycle numbers. The permeability has a significant difference during the loading and unloading stage and the permeability difference decreases with the increasing of cycle numbers. The permeability reduction mainly occurs in the initial stage of loading and unloading. There are significant differences in stress sensitivity for coal samples with different heights. The stress sensitivity decreases with the increasing of the height to diameter ratios of coal samples. During the loading and unloading stage，the reduction of dimensionless permeability increases with the increasing of the height to diameter ratio. After cyclic loading and unloading，the reduction rate of permeability increases with the increasing of height to diameter ratio. The recovery rate of permeability decreases with the increasing of height to diameter ratio.

Key words： rock mechanics cyclic loading and unloading axial compression height permeability stress sensitivity

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	Articles by authors
	WANG Chenlin1
	ZHANG Xiaodong1
	2
	LI Guizhong3
	DU Zhigang1
	ZHANG Shuo1

Cite this article:

WANG Chenlin1,ZHANG Xiaodong1,2, et al. Experimental study on the permeability of coal samples with different heights under cyclic loading and unloading[J]. , 2018, 37(10): 2299-2308.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0687 OR http://www.rockmech.org/EN/Y2018/V37/I10/2299

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