Correlation between acoustic emission characteristics and shear behavior of rock fracture

IF 4.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Engineering Analysis with Boundary Elements Pub Date : 2025-03-27 DOI:10.1016/j.enganabound.2025.106234

Yang Wu , Zhihong Zhao , Jinfan Chen , Jintong Zhang , Xingguang Zhao

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引用次数: 0

Abstract

Rock fractures significantly diminish shear strength and stability of rock masses. Understanding the shear behavior of fractured rock and associated energy release is essential for disaster prediction in rock engineering. This study investigates the shear behavior and damage evolution of intact and fractured rock samples through the analysis of acoustic emission (AE) characteristics. We conduct a series of direct shear tests and discrete element numerical simulations calibrated by experimental results. AE signals are simultaneously monitored during shear, and AE simulations are performed based on moment tensor inversion theory. We propose an effective method to determine crack damage stress, defined as the maximum gradient point of cumulative AE energy-shear displacement curve in the pre-peak stage. The results demonstrate that the distribution of explosive AE events is relatively concentrated along the fracture profile or failure zone, while implosive and shear events are principally located in the contacting asperities or fractures newly induced by shear. Meanwhile, a quantified relationship between shear parameters and AE energy has been established to assess shear properties and predict energy release. Its feasibility is validated by experimental results. The study contributes to providing a basis for analyzing rock failure in engineering and early warnings for rock mass disasters.

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岩石破裂声发射特征与剪切特性的相关性研究

岩石断裂会显著降低岩体的抗剪强度和稳定性。了解断裂岩石的剪切特性及其能量释放对岩石工程灾害预测至关重要。通过声发射（AE）特征分析，研究了完整和破碎岩石试样的剪切行为和损伤演化。我们进行了一系列的直剪试验和离散元数值模拟，并根据实验结果进行了校准。同时监测剪切过程中的声发射信号，并基于矩张量反演理论进行声发射模拟。提出了一种确定裂纹损伤应力的有效方法，将其定义为峰前阶段累积声发射能量-剪切位移曲线的最大梯度点。结果表明，爆炸声发射事件沿断裂剖面或破坏区分布相对集中，而内爆和剪切声发射事件主要分布在接触凸起处或剪切新诱发的断裂处。同时，建立了剪切参数与声发射能量之间的量化关系，用于评价剪切性能和预测能量释放。实验结果验证了该方法的可行性。该研究有助于为工程岩体破坏分析和岩体灾害预警提供依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Analysis with Boundary Elements 工程技术-工程：综合

CiteScore

5.50

自引率

18.20%

发文量

368

审稿时长

56 days

期刊介绍： This journal is specifically dedicated to the dissemination of the latest developments of new engineering analysis techniques using boundary elements and other mesh reduction methods. Boundary element (BEM) and mesh reduction methods (MRM) are very active areas of research with the techniques being applied to solve increasingly complex problems. The journal stresses the importance of these applications as well as their computational aspects, reliability and robustness. The main criteria for publication will be the originality of the work being reported, its potential usefulness and applications of the methods to new fields. In addition to regular issues, the journal publishes a series of special issues dealing with specific areas of current research. The journal has, for many years, provided a channel of communication between academics and industrial researchers working in mesh reduction methods Fields Covered: • Boundary Element Methods (BEM) • Mesh Reduction Methods (MRM) • Meshless Methods • Integral Equations • Applications of BEM/MRM in Engineering • Numerical Methods related to BEM/MRM • Computational Techniques • Combination of Different Methods • Advanced Formulations.