Effects of Water Saturation Pressure on Crack Propagation in Coal under Uniaxial Compression

Liu, Xiaobo; Long, Kun; Luo, Peng; Luo, Yong

doi:10.1007/s11053-022-10157-1

Cited by 4 publications

(4 citation statements)

References 37 publications

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“…When the water content is less than the content of critical water, the peak strength and elastic modulus increase with an increase in water content; when the water content is greater than the critical water content, the peak strength decreases with an increase in water content. Li et al [9], Wang et al [10], and Lu et al [11] have similar test results as those shown above.…”

Section: Effect Of Water Content On the Conversion Coefficientsupporting

confidence: 70%

Study on the Internal Mechanics and Energy Characteristics of Soil under Different Failure Modes

Tang

Wang

2023

Applied Sciences

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Under uniaxial compression, the soil mass may be subjected to transverse tensile splitting or swelling failure. This failure is caused by the tensile stress in the soil; that is, part of the vertical stress is converted into lateral stress. In order to investigate the factors that influence the stress transfer phenomenon, the failure mode of the soil mass can be predicted more accurately, and the internal force of the soil mass can be analyzed. This paper begins with the definition of the stress conversion coefficient and measures it by combining macroscopic mechanical properties with microscopic structure analyses. By carrying out a uniaxial compression test on a large soil sample, an equivalent tensile test was carried out according to the equivalent transverse displacement measured using the S-type tension sensor in order to explore the change law of the stress conversion coefficient. The arrangement and distribution of pores and particles at different positions in the samples before and after compression were further observed and analyzed using the SEM test to explore the formation mechanism of the stress transition phenomenon, and the following research results were obtained: (1) The stress conversion coefficient of the soil under compression is not invariable. An increase in the loading rate and a decrease in water content cause brittleness, and the stress conversion coefficient of the soil decreases. (2) Shear failure is more likely to occur in large samples of brittle soils under uniaxial compression. (3) The tensile stress in the compressed soil is caused by the invasion and extrusion of soil particles.

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Section: Effect Of Water Content On the Conversion Coefficientsupporting

confidence: 70%

Study on the Internal Mechanics and Energy Characteristics of Soil under Different Failure Modes

Tang

Wang

2023

Applied Sciences

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“…Incorporating effective medium theory and the quantitative relationship between moisture content ω, and multifractal parameter Δα, the limestone samples' peak strength and peak strain are described by Equation (12). In this study, the multifractal parameter ∆α of AE energy functions as an indicator of microcrack complexity, reflecting the physical and mechanical properties of the limestone samples.…”

Section: Quantitative Analysismentioning

confidence: 99%

“…Incorporating effective medium theory and the quantitative relationship between moisture content ω, and multifractal parameter ∆α, the limestone samples' peak strength and peak strain are described by Equation (12).…”

Section: Quantitative Analysismentioning

confidence: 99%

“…Debanjan et al [11] observed a general decrease in mechanical properties and fracture toughness in sedimentary rocks with increased saturation. Liu et al [12] found that the average compressive strength of coal samples decreased by 60.89%, and the failure modes shifted from inclined plane shearing to macrocracking under tensile stress as the saturation pressure rose from 0 to 6 MPa. Liu et al [13] stated that the variation in water content accelerates the argillization process of mudstone.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Influence Mechanism of Moisture Content on Macroscopic Mechanical Response and Microscopic Evolution Characteristic of Limestone

Zhang,

Sun,

et al. 2024

Buildings

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The uniaxial compression experiments and acoustic emission (AE) monitoring are conducted to investigate the macroscopic mechanical behavior and microscopic fracture characteristics of limestone samples with varying moisture contents. The findings revealed that as the moisture content increases from 0 to 6.6%, there is a decrease in peak stress and an increase in peak strain. A clear trend towards greater complexity in fracture characteristics is observed with increasing moisture content. In addition, AE activities demonstrate a heightened frequency, accompanied by an elevation in the corresponding multifractal parameter Δα as the moisture content rises. These variations are attributed to the increase in moisture content, which promotes the proliferation of small-scale microcracks and inhibits their evolution into large-scale microcracks. Consequently, the damage and failure process of the limestone samples transitions from being predominantly controlled by a few large-scale microcracks to being collectively influenced by a multitude of small-scale microcracks as the moisture content increases. In conjunction with the Criterion of Microcrack Density, the correctness of the analysis above is substantiated through mathematical derivation. Further, a quantitative model that links the microcrack system to moisture content is established based on the multifractal parameter Δα. Following this, a characterization model that depicts the macroscopic mechanical properties of limestone affected by moisture content is developed. This model effectively encapsulates the quantitative relationship between moisture content and the macroscopic characteristics of limestone and is validated through fitting experimental data. This research contributes to understanding the macroscopic mechanical response and microscopic fracture characteristics of limestone samples with different moisture contents, providing valuable insights and guidance for ensuring safety during engineering construction processes.

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Fatigue fracture behaviors and damage evolution of coal samples treated with drying–wetting cycles investigated by acoustic emission and nuclear magnetic resonance

Xie,

Zhang

et al. 2025

International Journal of Rock Mechanics and Mining Sciences

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Effects of Water Saturation Pressure on Crack Propagation in Coal under Uniaxial Compression

Cited by 4 publications

References 37 publications

Study on the Internal Mechanics and Energy Characteristics of Soil under Different Failure Modes

Study on the Internal Mechanics and Energy Characteristics of Soil under Different Failure Modes

Research on the Influence Mechanism of Moisture Content on Macroscopic Mechanical Response and Microscopic Evolution Characteristic of Limestone

Fatigue fracture behaviors and damage evolution of coal samples treated with drying–wetting cycles investigated by acoustic emission and nuclear magnetic resonance

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