Mechanical behavior of sandstone at various stages under cyclic loading
Zhengyu Sun, Wenjun Meng, Wenhao Dai, Zeping Liu
TL;DR
This study examines how sandstone behaves under repeated loading, revealing distinct mechanical responses during different stages of crack development.
Contribution
The study introduces a three-level cyclic loading approach to analyze sandstone behavior across crack closure, elastic deformation, and propagation stages.
Findings
Elastic modulus decreases rapidly during unstable crack propagation.
AE events and energy surge during stress drops, indicating crack propagation and coalescence.
Stress reduction per cycle in unstable propagation is over two orders of magnitude higher than in elastic deformation.
Abstract
This study employed a three-level cyclic loading path to investigate the mechanical behavior of sandstone across different failure stages under constant-amplitude cyclic loading. The loading path encompassed the initial crack closure, elastic deformation, and crack propagation stages. The mechanical behavior at each stage was characterized by analyzing deformation response, energy evolution, and acoustic emission (AE) characteristics. The results indicated that the mechanical response of the rock sample exhibited distinct stage-specific characteristics. In the unstable crack propagation stage, the elastic modulus decreased rapidly, the damage energy increased continuously, and both the number of AE events and the associated energy increased significantly. The average peak stress reduction per unit cycle during the unstable crack propagation stage exceeded that during the elastic…
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Taxonomy
TopicsRock Mechanics and Modeling · Geotechnical Engineering and Soil Mechanics · Seismic Imaging and Inversion Techniques