Experimental Study on Damage Evolution Characteristics of Granite Under Short-Term Freeze–Thaw Cycles
Xianda Yang, Peng Zeng, Kui Zhao, Dong Zhang, Hepeng Zhang, Nan Liang, Lihui Sun
TL;DR
This study examines how short-term freeze-thaw cycles affect granite's strength and damage characteristics, revealing how these cycles reduce rock stability and increase the risk of engineering failures.
Contribution
The paper introduces a multi-index damage characterization system to improve the accuracy of freeze–thaw damage assessment in rocks.
Findings
Freeze–thaw duration and cycle number positively correlate with the reduction in peak strength and elastic modulus of granite.
Acoustic emission cumulative ringing and energy rates show exponential decay with more freeze–thaw cycles.
A multi-index coupled damage variable provides a more reliable assessment of freeze–thaw damage than single-index methods.
Abstract
Rock engineering problems in short-term freeze–thaw zones and short-term freeze–thaw cycles can lead to a reduction in rock strength, thereby inducing engineering disasters. Granite in short-term freeze–thaw zones was selected as the research object. Taking the freezing time (1 h) required for the internal temperature of the rock to reach the target freezing temperature as the reference, freeze–thaw cycle tests with durations of 1 h, 2 h, and 3 h were carried out in sequence. Combined with uniaxial compression acoustic emission (AE) tests, the effects of freeze–thaw duration and freeze–thaw cycle number on the physical and mechanical properties and AE characteristics of the rock were systematically investigated. A multi-index damage characterization system was established. Results show that: (1) Both freeze–thaw duration and cycle number show a positive correlation with the attenuation…
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Taxonomy
TopicsClimate change and permafrost · Rock Mechanics and Modeling · Smart Materials for Construction