Study on the Characteristics of Fractured Rock Cracking and the Precursors of Instability

Yantao Yu; Yuan Chang; Yunyu Li; Shuyi Zhou; Mengyuan Zhou; Yulin Yang

doi:10.6919/ICJE.202506_11(6).0021

Authors

Yantao Yu
Yuan Chang
Yunyu Li
Shuyi Zhou
Mengyuan Zhou
Yulin Yang

DOI:

https://doi.org/10.6919/ICJE.202506_11(6).0021

Keywords:

Fractured Rock; Acoustic Emission; Cracking Precursors.

Abstract

In the fields of geology, mining, and hydropower engineering, the cracking and instability of fractured rocks pose a serious threat to project safety. This paper conducts uniaxial compression tests on rectangular sandstone samples containing pre-formed through-and-apart fractures, using advanced equipment to collect data and processing it with ORIGIN and MATLAB software to obtain acoustic emission stress-strain curves and grayscale images to record fracture propagation. The study finds that the failure of fractured sandstone samples is influenced by both wing cracks and secondary cracks, with the stress-strain curve divided into four stages, exhibiting brittle failure characteristics. Acoustic emission signals show different features at various deformation stages, characterized by dense signals and cumulative vibration The increase of bell count and the "step-like" change of stress-strain curve are the precursors of failure. The grayscale image and curve generated based on MATLAB can also reflect the crack propagation, and the abnormal change of grayscale value is also a precursor of failure, which provides a basis for related research.

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