Stress effect & scale effect on shear properties of double saw-tooth rock joint surface

IF 5.8 4区工程技术 Q1 MECHANICS Applied Rheology Pub Date : 2021-01-01 DOI:10.1515/arh-2020-0117

Zhan-you Luo, Mingyao Jiang, Linfei Mo, Baoping Zou, Man Huang

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引用次数: 2

Abstract

Abstract The shear properties of rock joint control the stability of rock and have an important impact on natural disasters such as landslides and debris flow. In order to study the stress effect and scale effect of shear properties of double saw-tooth rock joint, cement mortar is selected as similar material, a series of mix ratio tests are carried out, and the best mix ratio is obtained. Using rock joint integrated mold and joint panel produced by 3D printing technology, several groups of double saw-tooth joint specimens with different saw-tooth heights, saw-tooth widths, and saw-tooth spacings are made. Under multiple levels of normal stress, direct shear tests of different scale specimens are carried out by self-developed multifunctional rock-soil contact damage test system. Results show that the shear failure modes of double saw-tooth rock joint include couple effect of overriding and cutting off, and cutting off effect, which are mainly controlled by the rock joint morphology and normal stress. Peak shear strength increases with the increase of saw-tooth width and spacing, but the change with saw-tooth height is not obvious. Peak shear strength and peak friction angle of the double saw-tooth rock joint have significant characteristics of stress effect and scale effect.

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应力效应与尺度效应对双锯齿状岩石节理面剪切特性的影响

岩体节理的剪切特性控制着岩体的稳定性，对山体滑坡、泥石流等自然灾害具有重要影响。为了研究双锯齿状岩石节理抗剪性能的应力效应和尺度效应，选择水泥砂浆作为类似材料，进行了一系列配合比试验，得到了最佳配合比。利用3D打印技术生产的岩石节理集成模具和节理面板，制作了多组不同锯齿高度、锯齿宽度、锯齿间距的双锯齿节理试件。采用自行研制的多功能岩土接触损伤试验系统，在多级正应力条件下，对不同尺度试件进行了直剪试验。结果表明:双锯齿状节理的剪切破坏模式主要受节理形态和正应力的控制，包括覆切耦合效应和剪切效应;峰值抗剪强度随锯齿宽度和锯齿间距的增加而增加，但随锯齿高度的增加变化不明显。双锯齿节理的峰值抗剪强度和峰值摩擦角具有显著的应力效应和尺度效应特征。

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来源期刊

Applied Rheology 物理-力学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

>12 weeks

期刊介绍： Applied Rheology is a peer-reviewed, open access, electronic journal devoted to the publication in the field of applied rheology. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication.