干湿循环作用下节理面剪切力学特性演化规律

doi:10.13722/j.cnki.jrme.2018.0667

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Abstract

Under the cyclical elevation of reservoir water level，the rock mass in the sinking zone of bank slope is in a wet-dry cycle. The joint zone and full-fledged development of the fluctuating zone directly affect the deformation and stability of the reservoir bank slope. The dry-wet cycle test of rock mass joint surface was designed，and a multi-access repeated shear test method and data correction method for jointed surface was proposed. The test results show that：(1) Under the action of dry-wet cycle，the shearing mechanical properties of jointed surface have obvious deteriorating effects. With the increase of dry-wet cycle，the shear stress-shear deformation curve gradually moves downwards. The slope of the plastic hardening stage gradually decreases，and the tangential displacement at the shear yield point gradually increases. (2) The shear strength of the modified front and rear jointed surface is steeper as the cycle of wet and dry cycles increases. The deterioration trend is slow，and the shear strength degradation caused by the first eight dry-wet cycles action is large. (3) The law of deterioration of shear strength of jointed surface is closely related to the process of dry-wet cycle，and the lubrication，softening，the dissolution，erosion of the cement，and the water-rock geophysicist effects of various feldspar minerals have resulted in deterioration of the mechanical properties of the jointed surfaces. The related research results can provide a good basis for long-term deformation and stability analysis of bank slopes.

Key words： rock mechanics dry-wet cycle action jointed surface repeated shear

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	Articles by authors
	DENG Huafeng1
	DUAN Lingling1
	ZHI Yongyan1
	PAN Deng1
	LI Jianlin1
	WAN Liangpeng2

Cite this article:

DENG Huafeng1,DUAN Lingling1,ZHI Yongyan1, et al. Evolution of shear mechanical properties of jointed surface under dry-wet cycle[J]. , 2018, 37(S2): 3958-3967.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0667 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/3958

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