Experimental exploration of damage propagation in rocks using acoustic emission
Experimental exploration of damage propagation in rocks using acoustic emission
复制标题
声发射岩石损伤传播实验探索
DOI：
10.1007/s10064-021-02325-z
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发表时间：
2021-06-21
影响因子：
4.2
通讯作者：
Wang, Tingting
中科院分区：
文献类型：
--
作者：
Zhao, Wanchun;Wang, Zhizhang;Wang, Tingting
地震、岩爆等地质灾害的形成过程与雪崩类似。这些突发的灾难与一系列不连续的裂缝密切相关。在本研究中，通过评估三轴压缩下砂岩的声发射（AE）特征，揭示了岩石的损伤过程与加加速度现象（加载过程中应力的急剧变化）之间的关系。结果表明，加载过程中的声发射信号大部分为低能量拉伸信号。这些低能量信号的聚合和传输可能会引起抖动。高能剪切信号比例很低；然而，高能剪切信号可能会引起急动现象。砂岩破坏是岩石内部局部破坏和应力集中传递的过程。每个加载步骤的收集和传输的形式都不同。总体而言，转移定律表明损伤区域分散到样品的边缘，然后集中到中心。岩石的应力传递和局部损伤都伴随着一系列的急动。该研究加深了对岩石破坏过程的认识，为地质灾害的预防和预警提供了理论支撑。
The formation of geological disasters, such as earthquakes and rock bursts, is a process similar to avalanches. These sudden disasters are closely related to a series of discontinuous cracks. In this study, the relationship between the damage process and the jerk phenomenon (sharp change in stress during loading) of rocks was revealed by evaluating the acoustic emission (AE) characteristics of sandstone under triaxial compression. The results show that most of the AE signals during the loading process were low-energy tensile signals. The aggregation and transfer of these low-energy signals could induce jerks. The proportion of high-energy shear signals was very low; however, the high-energy shear signals could induce the jerk phenomenon. Sandstone failure is a process of local failure and stress concentration transfer within the rock. The forms of gather and transfer are different at each loading step. Overall, the transfer law indicates that the damage area disperses to the edge of the sample and then concentrates to the center. The stress transfer and local damage of rocks are accompanied by a series of jerks. This study provides a better understanding of the rock failure process and provides theoretical support for the prevention and early warning of geological disasters.