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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摘要黑云母石英片岩是一种典型的矿物定向排列致各向异性岩石，为研究其损伤演化规律及各向异性表现特征，针对含0°，45°，90°三种片理角度的试样，开展等塑性应变循环加卸载声波–力学联测试验。结果表明：随塑性应变的增加，3种试样的起裂强度、损伤强度与峰值强度变化趋势相同，其中与达到稳定时对应的塑性应变一致；对片理控制作用较强的45°试样，围压对其强度特征值比演化的影响较小，并且其损伤随塑性应变增长能更快达到稳定状态；在抗剪强度参数演化过程中，由各组试样黏聚力和内摩擦角的临界塑性应变，确定抗剪强度参数变化速率关系为45°＞0°＞90°，片理控制作用较强时表现出黏聚力快速损失、摩擦角快速增强特征；完整性系数演化至稳定状态所对应的塑性应变与相同，但片理角度不同则会对声波传输产生差异影响，导致不同围压下完整性系数的差异演化，其中90°片理试样表现最为显著。该研究借助多种量化指标分析，探究了矿物定向排列致各向异性岩石损伤演化的特殊力学行为。

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	包含1
	裴润生1
	兰恒星2
	晏长根1
	许江波1
	翟勇1
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	胥勋辉1

关键词 ：岩石力学, 黑云母石英片岩, 各向异性, 损伤演化, 强度特征值, 循环加卸载

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

引用本文:

包含1，裴润生1，兰恒星2，晏长根1，许江波1，翟勇1，3，胥勋辉1. 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[J]. 岩石力学与工程学报, 2021, 40(10): 2015-2026.
BAO Han1，PEI Runsheng1，LAN Hengxing2，YAN Changgen1，XU Jiangbo1，ZHAI Yong1，3，XU Xunhui1. Damage evolution of Biotite quartz schist caused by mineral directional arrangement under cyclic loading and unloading. , 2021, 40(10): 2015-2026.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0410 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I10/2015

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