Cluster and information entropy analysis of acoustic emission during rock failure process

IF 2.5 3区工程技术 Q2 ENGINEERING, CIVIL

Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.2.135

Zhenghu Zhang, L. Hu, Tiexin Liu, Hongchun Zheng, Chun’an Tang

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引用次数: 0

Abstract

This study provided a new research perspective for processing and analyzing AE data to evaluate rock failure. Cluster method and information entropy theory were introduced to investigate temporal and spatial correlation of acoustic emission (AE) events during the rock failure process. Laboratory experiments of granite subjected to compression were carried out, accompanied by real-time acoustic emission monitoring. The cumulative length and dip angle curves of single links were fitted by different distribution models and distribution functions of link length and directionality were determined. Spatial scale and directionality of AE event distribution, which are characterized by two parameters, i.e., spatial correlation length and spatial correlation directionality, were studied with the normalized applied stress. The entropies of link length and link directionality were also discussed. The results show that the distribution of accumulative link length and directionality obeys Weibull distribution. Spatial correlation length shows an upward trend preceding rock failure, while there are no remarkable upward or downward trends in spatial correlation directionality. There are obvious downward trends in entropies of link length and directionality. This research could enrich mathematical methods for processing AE data and facilitate the early-warning of rock failure-related geological disasters.

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岩石破坏过程声发射的聚类与信息熵分析

该研究为处理和分析声发射数据评价岩石破坏提供了新的研究视角。采用聚类方法和信息熵理论研究了岩石破坏过程中声发射事件的时空相关性。对花岗岩进行了室内压缩实验，并进行了实时声发射监测。采用不同的分布模型拟合了单连杆的累计长度和倾角曲线，确定了连杆长度和方向性的分布函数。在归一化外加应力条件下，研究了以空间相关长度和空间相关方向性两个参数表征的声发射事件分布的空间尺度和方向性。讨论了链路长度和链路方向性的熵。结果表明，累计链路长度和方向性的分布服从威布尔分布。空间相关长度在岩石破坏前呈上升趋势，而空间相关方向性没有明显的上升或下降趋势。链路长度和方向性熵有明显的下降趋势。该研究可以丰富声发射数据处理的数学方法，为岩石破坏相关地质灾害的预警提供依据。

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来源期刊

Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

5.20

自引率

25.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions