多级时效荷载下双裂隙砂岩变形与破裂特征试验研究

doi:10.13722/j.cnki.jrme.2016.1508

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Abstract Rocks in engineering projects experience usually the multistage time-dependent loading before reaching the final stress state. The triaxial compression experiments in laboratory were performed in order to investigate the effect of multistage time-dependent loading on the strength failure and crack coalescence behavior. The tests results showed that all the strengths of sandstone samples with three types of preexisting closed flaw pairs respectively under the multistage time-dependent loading decreased to some extent compared with those under conventional triaxial compression tests. For the type of specimens with high-low angle and high-high angle，the values of the strength under the multistage time-dependent loading were between the initiation stress level ?ci and the critical stress of dilation ?cd. Under the same stress loading path，the fractured rock showed the strong characteristics of shear failure with the increase of confining pressure. All of the low-low angle type of specimens showed the mode of rock bridge failure，indicating that the failure mode of the low-low angle type of specimens is mainly controlled by the distribution of the fracture itself，the influence of stress level and loading path is small. Under the multistage time-dependent loading，the failure of high-low angle and high-high angle type of specimens showed the mode of tensile failure. Burgers model for damage creep was used to analyze the relationship of these rock masses.

Key words： rock mechanics sandstone containing two pre-existing fissures multistage time-dependent loading crack coalescence time dependent damage model

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	Articles by authors
	YANG Chao1
	FENG Zhenhua1
	WANG Xin1
	HUANG Da2

Cite this article:

YANG Chao1,FENG Zhenhua1,WANG Xin1, et al. Experimental research on deformation and crack coalescence properties of sandstone containing two pre-existing fissures under multistage time-dependent loading[J]. , 2017, 36(9): 2092-2101.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.1508 OR http://www.rockmech.org/EN/Y2017/V36/I9/2092

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