基于三维形貌的节理抗剪强度弱化规律研究

doi:10.13722/j.cnki.jrme.2020.1073

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摘要采用3D扫描和打印技术浇筑一系列具有相同表面形貌的节理试样，针对试样开展不同法向应力、不同剪切位移条件下的直剪试验。通过分析剪切试验曲线和节理面损伤特征，研究峰后剪切过程中节理表面形貌的劣化规律及其与抗剪强度弱化间的关系，发现采用基于Grassilli形貌参数的三维粗糙度参数可以直观地量化表征节理表面形貌的劣化规律。将三维粗糙度参数引入JRC_JMC抗剪模型，并在分析节理面吻合度与三维粗糙度参数在峰后剪切过程中的变化规律基础上，提出节理峰后抗剪强度弱化模型。基于提出模型的计算值与试验结果基本一致，表明提出的模型可以较好地表征峰后剪切段节理的抗剪强度弱化规律。

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	彭勃1
	2
	刘亚群1
	2
	李海波1
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	申辉1
	2
	吴多华1
	2
	刘博1
	2
	夏祥1
	2

关键词 ：岩石力学, 节理, 三维形貌, 抗剪强度, 弱化规律, 峰值后区

Abstract：A series of joint specimens with the same surface morphology were poured by 3D scanning and printing technology. Direct shear tests were carried out under different normal stress and shear displacement conditions. By analyzing the experimental curves and joint surface damage characteristics，the deterioration of joint surface morphology and its relationship with the weakening of shear strength during post-peak shearing were studied. It was found the three-dimensional roughness parameter based on the Grassilli?s morphology parameters can quantitatively evaluate the deterioration of the joint surface morphology. By introducing the three-dimensional roughness parameter into the JRC_JMC model，the post-peak shear strength weakening model of joints was proposed based on the variation of the JMC and three-dimensional roughness parameter during post-peak shearing. The results obtained by the proposed model agreed well with those by direct tests，which indicated that the proposed model can better characterize the shear strength weakening law of joints at the post-peak shearing part.

Key words： rock mechanics joints three-dimensional morphology shear strength weakening law post-peak part

引用本文:

彭勃1，2，刘亚群1，2，李海波1，2，申辉1，2，吴多华1，2，刘博1，2，夏祥1，2 . 基于三维形貌的节理抗剪强度弱化规律研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3191-3200.
PENG Bo1，2，LIU Yaqun1，2，LI Haibo1，2，SHEN Hui1，2，WU Duohua1，2，LIU Bo1，2，XIA Xiang1，2. Study on shear strength weakening law of joints based on 3D topography. , 2021, 40(S2): 3191-3200.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1073 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3191

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