Experimental study on the evolutionary characteristics of acoustic signals produced by granite damage under uniaxial compression

IF 4 2区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Damage Mechanics Pub Date : 2023-03-02 DOI:10.1177/10567895231158147

Guo-shao Su, Xianjie Chen, Guikai Sun, Bingrui Chen, Guofu Zhao

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引用次数: 3

Abstract

Acoustic signals emitted during rock fracture constitute an important tool for rock damage evaluation. To investigate the evolutionary characteristics of acoustic emission (AE), microseismic (MS), and sound signals produced by hard rock fracture, uniaxial compression tests on granite specimens observed by AE, MS and sound monitoring were carried out. The evolution characteristics of the acoustic signal index, including its waveform, fractal dimension, b value, main frequency, energy proportion of signal frequency bands, and signal activeness, were analysed. The results indicate that there are significant differences in some characteristics of the AE, MS, and sound on the eve of granite failures, such as the waveform amplitude density, the average decline rate of the b value, the distribution of the main frequency, and the evolution of the energy proportion of the advantage frequency band. The three types of acoustic signals can characterize different scales of rock fracture under uniaxial compression. AE is sensitive to small-scale rock fractures, and MS and sound are sensitive to large-scale rock fractures. In addition, a unified damage evolution equation established by acoustic signals is proposed to quantitatively describe the damage process of granite specimens during uniaxial compression tests.

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花岗岩单轴压缩损伤声信号演化特征的实验研究

岩石破裂过程中发出的声信号是评价岩石损伤的重要工具。为研究硬岩破裂产生的声发射(AE)、微震(MS)和声信号的演化特征，对花岗岩试样进行了声发射、质谱和声监测的单轴压缩试验。分析了声信号指标的演变特征，包括声信号波形、分形维数、b值、主频率、信号频带能量占比、信号活跃性等。结果表明:花岗岩破坏前夕的声发射、质谱和声音特征在波形幅值密度、b值平均衰减率、主频率分布以及优势频段能量占比演化等方面存在显著差异;这三种类型的声信号可以表征岩石在单轴压缩下不同尺度的破裂。声发射对小尺度岩石裂缝敏感，质谱和声音对大尺度岩石裂缝敏感。此外，提出了统一的基于声信号的损伤演化方程，定量描述了花岗岩试件在单轴压缩试验中的损伤过程。

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

International Journal of Damage Mechanics 工程技术-材料科学：综合

CiteScore

8.70

自引率

26.20%

发文量

审稿时长

5.4 months

期刊介绍： Featuring original, peer-reviewed papers by leading specialists from around the world, the International Journal of Damage Mechanics covers new developments in the science and engineering of fracture and damage mechanics. Devoted to the prompt publication of original papers reporting the results of experimental or theoretical work on any aspect of research in the mechanics of fracture and damage assessment, the journal provides an effective mechanism to disseminate information not only within the research community but also between the reseach laboratory and industrial design department. The journal also promotes and contributes to development of the concept of damage mechanics. This journal is a member of the Committee on Publication Ethics (COPE).