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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摘要

在库水位周期性升降作用下，库岸边坡消落带岩体处于干湿循环状态，消落带节理、裂隙充分发育，直接影响库岸边坡的变形和稳定。设计进行岩体节理面的干湿循环作用试验，提出节理面单试件多周期重复剪切试验方法和数据修正方法。试验结果表明：(1) 在干湿循环作用下，节理面的剪切力学特性劣化效应明显，随着干湿循环周期的增加，剪切应力–剪切变形曲线整体逐渐下移，弹性阶段和塑性硬化阶段的斜率逐渐减小，达到剪切屈服点的切向位移逐渐增大；(2) 随着干湿循环作用周期的增加，修正前、后节理面的抗剪强度呈先陡后缓的劣化趋势，前8次干湿循环作用导致的抗剪强度劣化幅度较大；(3) 节理面抗剪强度的劣化规律与干湿循环作用的进程密切相关，水的润滑、软化、钙质胶结物的溶解、溶蚀和各种长石矿物的水–岩物理化学作用导致了节理面力学特性的劣化。相关研究成果可为库岸边坡长期变形稳定分析提供较好的依据。

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	邓华锋1
	段玲玲1
	支永艳1
	潘登1
	李建林1
	宛良朋2

关键词 ：岩石力学, 干湿循环作用, 节理面, 重复剪切

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

引用本文:

邓华锋1，段玲玲1，支永艳1，潘登1，李建林1，宛良朋2. 干湿循环作用下节理面剪切力学特性演化规律[J]. 岩石力学与工程学报, 2018, 37(S2): 3958-3967.
DENG Huafeng1，DUAN Lingling1，ZHI Yongyan1，PAN Deng1，LI Jianlin1，WAN Liangpeng2. Evolution of shear mechanical properties of jointed surface under dry-wet cycle. , 2018, 37(S2): 3958-3967.

链接本文:

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

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