循环加卸载下柱状节理材料渗透率和孔隙度演化规律研究

doi:10.13722/j.cnki.jrme.2016.1757

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Abstract The variations of the permeability and porosity of columnar jointed artificial rock under cyclic loading and unloading of the confining pressure were measured by using the inert gas permeability test device. In the first stage of confining pressure loading，the confining pressure has a great effect on the permeability and porosity，and the changes of the permeability and porosity are irreversible. In the subsequent stages of cyclic loading and unloading，the change of the confining pressure has a less effect on the permeability and porosity. The relationships between the permeability or porosity of columnar jointed artificial material and the confining pressure were fitted with the power functions during the confining pressure-loading stage. In the unloading stage of confining pressure，the relationship of the permeability and confining pressure can described as a power function，and the one of the porosity and confining pressure can described as an exponential function. The sensitivities of the permeability and porosity to confining pressure decreases with the confining pressure increasing，while the sensitivities of the permeability and porosity to confining pressure can be restored fully after confining pressure unloading. In the each stage of confining pressure loading and unloading，the relationship curves between the sensitivity of permeability to the change of confining pressure and column inclination exhibit a double peak pattern. The value of first peak is greater than the second one. The relationship between the porosity and permeability shows a power function in the loading stage of confining pressure，and a power-exponent function in the confining pressure unloading stage. The sensitivity of the permeability to the change of porosity increases with the porosity increasing. The relationship curves between the sensitivity of the permeability to the change of porosity and column angle exhibit a double peak pattern，and the first peak value is greater than the second one.

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	Articles by authors
	CHAO Zhiming1
	WANG Huanling1
	XU Weiya2
	JI Hua2
	ZHAO Kai1

Cite this article:

CHAO Zhiming1,WANG Huanling1,XU Weiya2, et al. Permeability and porosity of columnar jointed rock under cyclic loading and unloading[J]. , 2017, 36(1): 124-141.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1757 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/I1/124

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