粗砂岩变形破坏过程中渗透性试验研究

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Abstract Permeability experiments of deformation and failure processes of gritstone are carried out in triaxial test instrument. The permeability of gritstone in deformation and failure processes is analyzed. The impact of confining pressure on permeability of gritstone is studied. And the relationship between permeability and volume strain was discussed. It is shown that in the triaxial compression test，the total change law of permeability presents the corresponding stage characteristic of the curve of stress-strain. It is that the permeability reduces slightly with the increase of partial stress in the stages of micro fracture compression and elastic deformation；in the elasto-plastic stage，along with the expansion of new fractures，the permeability increases slowly at first and then sharply reaches the maximum value after peak point；at residual flowage stage，the fracture which controls the permeability of gritstone is compressed because the confining pressure and the permeability decreases. During the process of deformation and failure，the permeability decreases because the generation connected fissures is compressed by the confining pressure. The permeability is more sensitive to the change of hoop strain in the deformation and failure processes of rock sample. The greater the confining pressure is，the smaller the peak value and the post-peak residual value of permeability various curve of gritstone are，and the more gentle the curve of permeability-strain is. Lastly，based on the mass conservation equation of the theory of porous media，the relationship between porosity and volume strain is deduced. By using the Kozeny-Carman equation，the relationship between the permeability and volume strain is studied，the results show that the Kozeny-Carman equation has good applicability when pores dominate the flow channel.

Key words： rock mechanics gritstone deformation and failure processes triaxial permeability test

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	WANG Xiaojiang1
	2
	RONG Guan1
	2
	ZHOU Chuangbing1

Cite this article:

WANG Xiaojiang1,2,RONG Guan1, et al. PERMEABILITY EXPERIMENTAL STUDY OF GRITSTONE IN DEFORMATION AND FAILURE PROCESSES[J]. , 2012, 31(S1): 2940-2947.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/2940

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