A comprehensive study of damage characteristics and acoustic emission response mechanism of sandstone with different water contents

Zhang, Hexing; Lu, Kunpeng; Zhang, Wuzhou; Yu, Zhenhong; Yang, Gui; Chongping, Huang

doi:10.1016/j.engfracmech.2023.109392

Cited by 10 publications

(3 citation statements)

References 49 publications

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“…12 , as the number of freeze‒thaw cycles increases, the internal microcracks of the mixed granite show a decrease in shear cracks and an increase in tensile cracks. This observation aligns with the findings of Du 36 , suggesting that freeze‒thaw-induced rock fractures are chiefly characterized by thoroughgoing fractures and intergranular fractures, among which tensile cracks dominate. Notably, the propagation strength of these cracks remains moderately consistent throughout the loading process.…”

Section: Failure Modes Based On Ra-afsupporting

confidence: 90%

“…Notably, an observed increase in low-frequency signals coincides with a decrease in the proportion of high-frequency signals. According to the published literature 36 , due to the natural fractures in the mixed granite rock sample, the intermediate frequency signal characterizing microcrack friction has existed since the AB stage. Additionally, the friction between mineral particles or intercrystalline ruptures gives rise to low-frequency signals.…”

Section: Resultsmentioning

confidence: 99%

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Mechanical properties and acoustic emission characteristics of mixed granite after different numbers of freeze‒thaw cycles

Cao,

Hu,

Wang

et al. 2024

Sci Rep

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The mechanical properties of rocks in cold regions undergo significant changes as a result of decades of freeze‒thaw cycles with seasonal variations, which can lead to a series of geological disasters, such as collapse. This study investigates the evolution of the mechanical characteristics and internal progressive damage characteristics of mixed granite under freeze‒thaw cycling and axial loading. By measuring the mass, wave velocity, and uniaxial compressive strength of rock samples and combining these metrics with acoustic emission (AE) characteristics, the physical and mechanical properties and microfracture development of mixed granite after different numbers of freeze‒thaw cycles were investigated. The results indicate that as the number of freeze‒thaw cycles increases, the longitudinal wave velocity, uniaxial compressive strength, and elastic modulus of the mixed granite decrease nonlinearly, while the peak strain gradually increases. Combined with the stress‒strain curve, the AE characteristics can be divided into four stages. As the number of freeze‒thaw cycles increases, the AE cumulative count decreases, and the AE counts of the four stages are different. The low-frequency-high-amplitude signals first increases and then tends to stabilize, and they only appeared in the third and fourth stages. At the same time, the proportion of the low-frequency ratio gradually increases, and the proportion of the high-frequency ratio decreases. In addition, based on the rise time/amplitude (RA) and average frequency (AF) characteristics and failure modes, it was found that the internal crack types of mixed granite transition from shear cracks to tensile cracks, among which tensile cracks play a crucial role in rock failure.

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Section: Failure Modes Based On Ra-afsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Mechanical properties and acoustic emission characteristics of mixed granite after different numbers of freeze‒thaw cycles

Cao,

Hu,

Wang

et al. 2024

Sci Rep

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“…Kim and Jing [9,10] conducted a comprehensive study on the seepage-stress coupling in rock masses during excavation using a discontinuous deformation analysis approach. Geng, Wang, Chen, and Zhang [11][12][13][14] used acoustic emission and energy dissipation methods to analyze sandstones with different moisture levels. They found that the average cumulative acoustic emission energy release for dry and naturally occurring samples is significantly greater than for saturated samples.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Influence of Stress Conditions on the Permeability Characteristics of Weakly Cemented Sandstone

Zhen,

Liu,

Chi

et al. 2023

Applied Sciences

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This study, conducted in the geological context of the Yixin coalfield, systematically performed indoor mechanical tests to analyze the impact of different stress conditions on the permeability of weakly cemented sandstone. The results were used to establish numerical simulations of permeability curves, revealing the following key findings. (1) After saturation, weakly cemented sandstone transitions from brittle to plastic failure. Numerical simulations closely matched experimental results, ensuring the accuracy of subsequent permeability simulations using the Hoek–Brown method. (2) Indoor permeability experiments identified a unique “√” shaped permeability curve for weakly cemented sandstone, differing from traditional sandstone. Numerical simulations confirmed this pattern and provided a basis for modeling weakly cemented strata under varying confining pressures. (3) The mesoscopic analysis of numerical simulation shows that that confining pressure limits the expansion of microcracks, while pore pressure causes cracks to develop from high- to low-pressure areas. Increasing pore pressure gradually raises permeability, and elevated confining pressure initially reduces, then increases permeability. (4) A damage parameter “D” was introduced to monitor fractures during compression simulations, showing that with increasing confining pressure, the damage parameter decreases and then sharply increases. Hydraulic pressure differentials directly correlated with the damage. This comprehensive study enhances our understanding of weakly cemented sandstone’s hydrological behavior under varying stress conditions and parameters.

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Critical slowing down features of acoustic emission signals for predicting the failure of black sandstone under different freezing temperatures

Zhou,

Wang,

Ullah

2024

Bull Eng Geol Environ

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A comprehensive study of damage characteristics and acoustic emission response mechanism of sandstone with different water contents

Cited by 10 publications

References 49 publications

Mechanical properties and acoustic emission characteristics of mixed granite after different numbers of freeze‒thaw cycles

Mechanical properties and acoustic emission characteristics of mixed granite after different numbers of freeze‒thaw cycles

Investigation into the Influence of Stress Conditions on the Permeability Characteristics of Weakly Cemented Sandstone

Critical slowing down features of acoustic emission signals for predicting the failure of black sandstone under different freezing temperatures

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