基于循环加卸载的矿物定向排列致各向异性岩石损伤演化规律——以黑云母石英片岩为例

doi:10.13722/j.cnki.jrme.2021.0410

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Abstract The biotite quartz schist is a typical anisotropic rock caused by mineral arrangement. In order to study its damage evolution law and anisotropic characteristics，the equal plastic strain cyclic loading and unloading tests with acoustic-force joint measurement were carried out on the samples with schistosity angles of 0°，45° and 90°. The results show that，with increasing the plastic strain，the variation trends of the initiation strength ，the damage strength and the peak strength of three kinds of samples are similar，and the plastic strains corresponding to stable and are same. For the 45°samples with strong control effects by schistosity，the confining pressure has little influence on the evolution of the strength characteristic value ratio，and the damage can fastly reach a stable state with growing the plastic strain. During the evolution of the shear strength parameters，the variation rate of the shear strength parameters of the group samples with a schistosity angle of 45° is the largest based on the critical plastic strain of the cohesive and the friction angle，followed by 0° and 90°， showing that the cohesion rapidly losses while the friction angle rapidly increases when the effect of schistosity control is strong. The corresponding plastic strain of the integrity coefficient evolving to a stable state is the same as that of . However，the different schistosity angles have different effects on acoustic transmission，resulting in the differential evolution of the integrity coefficient under different confining pressures，especially for the samples with a schistosity angle of 90°. This study explores the special mechanical behaviors of the damage evolution of anisotropic rock caused by the directional arrangement of minerals according to the analysis of quantitative indexes.

Key words： rock mechanics biotite quartz schist anisotropy damage evolution strength characteristic value cyclic loading and unloading

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	Articles by authors
	BAO Han1
	PEI Runsheng1
	LAN Hengxing2
	YAN Changgen1
	XU Jiangbo1
	ZHAI Yong1
	3
	XU Xunhui1

Cite this article:

BAO Han1,PEI Runsheng1,LAN Hengxing2, et al. Damage evolution of Biotite quartz schist caused by mineral directional arrangement under cyclic loading and unloading[J]. , 2021, 40(10): 2015-2026.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0410 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I10/2015

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