锚杆杆体–砂浆界面剪切力学特性试验研究

doi:10.13722/j.cnki.jrme.2017.1090

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摘要为研究锚杆杆体–砂浆界面力学特性及其破坏模式，进行简化的锚杆杆体–砂浆界面直剪试验，分析法向应力与横肋间距对界面力学特性及破坏模式的影响，阐述界面剪切滑移与剪胀特性，并对界面剪切强度与破坏模式进行分析与解释。试验结果表明：剪切滑移曲线和剪胀曲线均具有明显的阶段特征，界面剪切破坏为典型的脆性破坏，随着横肋间距增大，脆性程度有所减弱；界面破坏模式可划分为剪胀滑移破坏、切齿破坏及复合破坏模式三种，随着法向应力增大，界面破坏逐渐由剪胀滑移破坏向切齿破坏过渡，且剪胀位移明显减小；随着横肋间距增大，更容易出现剪胀滑移破坏，且剪胀位移明显增大；剪胀起始点对应的剪切应力约为0.5τmax。试验结果能够为进一步研究砂浆锚固系统的破坏准则和力学模型，揭示其破坏机制奠定基础。

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	张传庆1
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	崔国建1
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	周辉1
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	刘立鹏3
	刘振江1
	2
	卢景景1
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	程广坦1
	2

关键词 ：岩土工程, 锚杆砂浆界面, 直剪试验, 力学特性, 界面破坏模式

Abstract：In order to study the mechanical properties and failure modes of the rod-grout interface，the direct shear tests of the rod-grout interface under different normal stresses and rib spacings were carried out. The characteristics of shear stress-shear displacement curves and dilatation curves were discussed，and the shear strength and the failure modes of the interface were analyzed and explained in detail. Four stages were observed in the shear stress-shear displacement curves and three stages were observed in the dilation curves. The experimental results indicated that the rod-grout interface had a strong characteristic of brittle failure，and the degree of brittleness decreased with the increasing of rib spacing. The failure modes of interface can be divided into the dilation slip failure，the shear through failure and the compound failure. With the increasing of the normal stress，the normal displacement decreased significantly and the failure mode transformed gradually from the dilation slip failure to the shear through failure. The normal displacement and the possibility of dilation slip failure increased significantly with the increasing of rib spacing. In addition，the shear stress in interface at dilation initiation was approximately 0.5 of the peak shear strength.

Key words： geotechnical engineering rod-grout interface direct shear test mechanical properties failure mode of interface

引用本文:

张传庆1，2，崔国建1，2，周辉1，2，刘立鹏3，刘振江1，2，卢景景1，2，程广坦1，2. 锚杆杆体–砂浆界面剪切力学特性试验研究[J]. 岩石力学与工程学报, 2018, 37(4): 820-828.
ZHANG Chuanqing1，2，CUI Guojian1，2，ZHOU Hui1，2，LIU Lipeng3，LIU Zhenjiang1，2，LU Jingjing1，2，CHENG Guangtan1，2. Experimental study on shear and deformation characteristics of the rod-grout interface. , 2018, 37(4): 820-828.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1090 或 http://www.rockmech.org/CN/Y2018/V37/I4/820

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