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<p>Exposure to wet–dry cycles within acidic environments markedly exacerbates the degradation and damage of silty mudstone, potentially precipitating geological hazards such as collapses, landslides, and instabilities in rock slopes. Addressing these challenges, this study investigates the mechanical characteristics and microstructural alterations of silty mudstone subjected to dry–wet cycling in acidic conditions, employing field sampling techniques. Through the application of uniaxial and triaxial compression tests, the study meticulously examines the compressive strength, deformation, and failure mechanisms of silty mudstone following dry–wet cyclic testing, with a concentrated focus on its mechanical properties. Findings indicate a progressive decline in the compressive strength of silty mudstone with each dry–wet cycle, most notably after the initial two cycles. A reduction in pH value conspicuously diminishes both the compressive strength and the elastic modulus of the rock samples. Furthermore, the deformation behavior of silty mudstone reveals that the compaction phase elongates as the pH value decreases, culminating in pronounced plastic failure. Electron microscope analyses elucidate that the internal porosity of the rock samples intensifies and coalesces over successive dry and wet cycles, transitioning from isolated pores to interconnected voids. The porosity and fractal dimensions of the rock were quantitatively assessed using a Crack Analysis System (PCAS), demonstrating that fractal theory adeptly captures the mesoscopic damage evolution in silty mudstone across various dry–wet cycles. Initial damage in silty mudstone is predominantly attributed to alterations in pore structure during early dry–wet cycles. Concerning the damage constitutive model, the study selects suitable damage variables based on dry–wet cyclic test outcomes. Utilizing Weibull distribution and the Mohr–Coulomb strength criterion, it constructs statistical constitutive models for rock damage during dry–wet cycles under varying pH conditions, founded on continuous damage theory and Lemaitre's strain equivalence hypothesis. The models are shown to accurately represent the damage dynamics of silty mudstone under diverse environmental conditions during dry–wet cycling.</p>

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Effects of Wet–Dry Cycles and Acidic Environments on the Mechanical Properties and Microstructure of Silty Mudstone

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Junqi Yu,
  • Hui Deng,
  • Songbo He,
  • Linyi Lv

摘要

Exposure to wet–dry cycles within acidic environments markedly exacerbates the degradation and damage of silty mudstone, potentially precipitating geological hazards such as collapses, landslides, and instabilities in rock slopes. Addressing these challenges, this study investigates the mechanical characteristics and microstructural alterations of silty mudstone subjected to dry–wet cycling in acidic conditions, employing field sampling techniques. Through the application of uniaxial and triaxial compression tests, the study meticulously examines the compressive strength, deformation, and failure mechanisms of silty mudstone following dry–wet cyclic testing, with a concentrated focus on its mechanical properties. Findings indicate a progressive decline in the compressive strength of silty mudstone with each dry–wet cycle, most notably after the initial two cycles. A reduction in pH value conspicuously diminishes both the compressive strength and the elastic modulus of the rock samples. Furthermore, the deformation behavior of silty mudstone reveals that the compaction phase elongates as the pH value decreases, culminating in pronounced plastic failure. Electron microscope analyses elucidate that the internal porosity of the rock samples intensifies and coalesces over successive dry and wet cycles, transitioning from isolated pores to interconnected voids. The porosity and fractal dimensions of the rock were quantitatively assessed using a Crack Analysis System (PCAS), demonstrating that fractal theory adeptly captures the mesoscopic damage evolution in silty mudstone across various dry–wet cycles. Initial damage in silty mudstone is predominantly attributed to alterations in pore structure during early dry–wet cycles. Concerning the damage constitutive model, the study selects suitable damage variables based on dry–wet cyclic test outcomes. Utilizing Weibull distribution and the Mohr–Coulomb strength criterion, it constructs statistical constitutive models for rock damage during dry–wet cycles under varying pH conditions, founded on continuous damage theory and Lemaitre's strain equivalence hypothesis. The models are shown to accurately represent the damage dynamics of silty mudstone under diverse environmental conditions during dry–wet cycling.