The acoustic emission characteristics study of geo-granular materials based on stacking shear tests

被引：0

作者：

Yidan Huang ^{[1
]}

Wentai Chen ^{[2
]}

Yulin Zhan ^{[3
]}

机构：

[1] Southwest Jiaotong University,School of Civil Engineering

[2] National Engineering Research Center of Geological Disaster Prevention Technology in Land Transportation,undefined

[3] Key Laboratory of High-speed Railway Engineering (Ministry of Education),undefined

来源：

Bulletin of Engineering Geology and the Environment | 2025年 / 84卷 / 7期

关键词：

Acoustic emission; Information entropy; Energy dissipation; Geo-Granular material; Stacking shear;

D O I：

10.1007/s10064-025-04382-0

中图分类号：

学科分类号：

摘要：

Most geological materials can be classified as granular materials. Knowledge of the shear behavior of granular materials has important practical and scientific significance for better understanding the mechanisms for initiation and mobility of geological disasters. Acoustic emission (AE) testing captures elastic wave signals, directly reflecting the material’s physical and mechanical mechanisms. Although promising progress has been made in understanding the AE characteristics of granular systems, much remains unknown regarding the correlation between AE signals and geo- granular materials, particularly for the involved physical processes and failure mechanisms. The motivation for this study is to investigate the correlation of the AE signal with the granular shear behavior by designing a series of laboratory tests. Stacking Shear-Acoustic Emission tests were conducted on nonuniform sand samples with varying fractal dimensions and a maximum particle size of 40 mm. The AE characteristics and their changes throughout the entire shearing process of geo-granular materials were analysed and then compared to the energy dissipation rate calculated on the basis of granular solid hydrodynamics (GSH) theory. Finally, the AE signals were explained based on the principle of the minimum energy dissipation rate. The results showed that geo-granular energy release occurs consistently prior to changes in the macroscopic mechanical parameters, and the ring-down count (RDC) of the AE signals decreases significantly as the system approaches the residual stage. For the same geo-granular material, the higher the vertical load is, the lower the AE energy information entropy. Under the same vertical load, the AE energy information entropy is inversely related to the shear strength. In conclusion, the AE energy behavior aligns with the principle of the minimum energy dissipation rate. This study provides a new understanding of the AE characteristics of geo-granular materials during shearing from the perspective of energy dissipation, and the conclusions provide a scientific basis for disaster monitoring and prevention.

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