基于砂岩三轴加载过程声发射与波速变化的峰前特征应力识别研究

doi:10.13722/j.cnki.jrme.2022.1327

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Abstract 为了准确识别不同围压条件下岩石加载过程中的峰前特征应力，在GCTS RTX–3000试验机上对砂岩标准试样进行围压分别为0，10，30，50和70 MPa的假三轴试验，采用超声波测试系统和声发射采集系统同时监测，获得砂岩加载过程中超声波波速的变化规律和声发射定位事件的分布特征，提出一种能够从声发射采集的数据中屏蔽超声波干扰信号的方法。结果表明：试样纵、横波波速随着围压的增加呈二次函数关系，随着轴压的增加呈现增长–平稳–下降的变化规律，横波波速总是先于纵波波速出现下降趋势，横波相较于纵波对损伤更加敏感；对比体积应变、声发射、超声波和动态弹性参数的变化规律，能够准确判定试样的峰前特征应力，闭合应力对应横波波速上升结束时刻，起裂应力对应横波波速开始下降时刻以及动弹性模量的拐点，损伤应力能够通过纵波波速开始下降、声发射信号快速上升时刻和体积应变的拐点共同确定；声发射定位能够直观反应试样的破坏模式，低围压条件下，试样发生劈裂–剪切混合破坏，高围压条件下，试样发生剪切破坏。该研究有助于准确识别岩石受载时的峰前特征应力，深入了解不同应力条件下岩石的损伤特征，对深部地下工程岩体的稳定性评价有重要的理论意义。

Key words：岩石力学三轴压缩声发射峰前特征应力

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	Articles by authors
	ZHANG Xulong1
	ZHANG Sheng1
	2
	WANG Longfei1
	RONG Tenglong1
	2
	ZHOU Rui1

Cite this article:

ZHANG Xulong1,ZHANG Sheng1,2, et al. Identification of pre-peak characteristic stress of sandstone under triaxial loading based on acoustic emission and wave velocity variation[J]. , 2023, 42(11): 2711-2726.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1327 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I11/2711

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