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<p>This study employs XRD and SEM-EDS techniques to analyze the changes in the composition and microstructure of sandstone before and after immersion in sulfuric acid at different pH levels. It systematically investigates the chemical corrosion mechanism of sandstone in sulfuric acid solution and the mechanical behavior under unloading conditions on the true triaxial symmetry plane. The experimental results indicate that when sandstone is immersed in sulfuric acid, acid-soluble minerals within the sandstone gradually dissolve, while cementing substances such as CaSO₄, Fe(OH)₃, and H₂SiO₃ are formed. As the pH of the solution decreases, both the mass and P-wave velocity of the sandstone continuously decline, with the mass loss rate and P-wave velocity loss rate significantly increasing, reaching 1.53%, 1.45%, and 23.52%, 21.74%, respectively. Pores and cracks progressively expand, intensifying the degree of weathering. The peak stress, yield stress, and elastic modulus gradually decrease, while the peak strain increases significantly. Through regularized ridge regression and correlation analysis, the quantitative relationship between degree of weathering and both physical and mechanical properties is further revealed. This study provides crucial scientific evidence for understanding the long-term deterioration mechanism of sandstone in acidic environments.</p>

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Mechanisms and mechanical behavior of acid-corroded sandstone under true triaxial unloading

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Weipeng Pan,
  • Yuchao Zheng,
  • Lei Long,
  • Jiahao Min,
  • Liang Luo,
  • Xiang He,
  • Huijian Zhang,
  • Peng Yang,
  • Feng Lu

摘要

This study employs XRD and SEM-EDS techniques to analyze the changes in the composition and microstructure of sandstone before and after immersion in sulfuric acid at different pH levels. It systematically investigates the chemical corrosion mechanism of sandstone in sulfuric acid solution and the mechanical behavior under unloading conditions on the true triaxial symmetry plane. The experimental results indicate that when sandstone is immersed in sulfuric acid, acid-soluble minerals within the sandstone gradually dissolve, while cementing substances such as CaSO₄, Fe(OH)₃, and H₂SiO₃ are formed. As the pH of the solution decreases, both the mass and P-wave velocity of the sandstone continuously decline, with the mass loss rate and P-wave velocity loss rate significantly increasing, reaching 1.53%, 1.45%, and 23.52%, 21.74%, respectively. Pores and cracks progressively expand, intensifying the degree of weathering. The peak stress, yield stress, and elastic modulus gradually decrease, while the peak strain increases significantly. Through regularized ridge regression and correlation analysis, the quantitative relationship between degree of weathering and both physical and mechanical properties is further revealed. This study provides crucial scientific evidence for understanding the long-term deterioration mechanism of sandstone in acidic environments.