CNL及CNS条件下结构面剪切特性试验研究

doi:10.13722/j.cnki.jrme.2018.0909

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摘要为比较CNL及CNS边界条件下结构面剪切力学特性的差异，开展2种法向边界条件下不同粗糙度结构面的直剪试验研究，系统阐述法向刚度、初始法向应力及结构面粗糙度对结构面剪切力学特性的影响。试验结果表明，低法向应力水平下，法向刚度效果显著，CNS条件下剪切位移曲线展现出明显的硬化特征，剪胀曲线被抑制，峰值及残余剪切强度、峰值剪切位移及峰值法向位移均大于CNL试验结果。随着法向应力增大，法向刚度效果逐渐减弱，高法向应力水平下，CNS和CNL试验结果相近。试验成果有助于进一步认识CNL和CNS条件下结构面剪切力学特性及其差异。

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	崔国建1
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	张传庆1
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	韩华超3
	曾志全3
	周辉1
	2
	卢景景1
	2

关键词 ：岩石力学, 岩石结构面, 常法向刚度, 常法向荷载, 直剪试验, 剪胀

Abstract：To compare the shear behavior of rough rock joints under the CNL and CNS conditions，a series of direct shear tests of rough artificial joints under both CNL and CNS conditions were conducted. The effects of boundary conditions，initial normal stress and joint roughness on shearing behavior of the artificial joints were analyzed. Test results showed that the effect of normal stiffness is significant under low initial normal stress level. The strain hardening behavior of shear stress-shear displacement curves were observed under the CNS conditions，which is different from the strain softening behavior under the CNL conditions，and the normal displacement was further suppressed in the CNS tests. The peak and residual shear strengths，peak shear and normal displacements were larger under the CNS conditions than that under the CNL conditions. With the increase of initial normal stress，the effect of normal stiffness is gradually weakened. Under the high initial normal stress level，the shear test results under both CNS and CNL conditions are similar. Test results could improve the understanding of the shear behavior of the rough joint under the CNL and CNS conditions.

Key words： rock mechanics rock joint constant normal stiffness constant normal load direct shear test dilation

引用本文:

崔国建1，2，张传庆1，2，韩华超3，曾志全3，周辉1，2，卢景景1，2. CNL及CNS条件下结构面剪切特性试验研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3384-3392.
CUI Guojian1，2，ZHANG Chuanqing1，2，HAN Huachao3，ZENG Zhiquan3，ZHOU Hui1，2，LU Jingjing1，2. Experiment study on shear behavior of artificial joint under CNL and CNS boundary conditions. , 2019, 38(S2): 3384-3392.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0909 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3384

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