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<p>Volcanic soil has been used as an alternative material in infrastructure construction, yet the friable nature of its particles poses significant engineering challenges. In this study, the repeated one-dimensional compression tests were conducted on volcanic soil with different particle groups and relative densities. The results showed that the soil stiffness, represented by the secant modulus (<i>E</i><sub>sec</sub>), increased to 4 ~ 7 times its initial value after three load cycles. The relative breakage index (<i>B</i><sub>r</sub>) ranged from 0.16 to 0.26 under the tested conditions, showing positive correlations with vertical stress, loading number, and particle size, and a negative correlation with relative density. The proposed predictive models for volumetric strain and breakage index showed that both parameters stabilized (RMSE &lt; 2%) after more than 3 loading numbers. This study provides a theoretical basis for deformation and breakage assessment of volcanic soils for engineering applications as marginal materials.</p>

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Mechanical behavior and particle breakage evolution of vesicular volcanic soil under repeated one-dimensional compression

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Di Wu,
  • Changming Wang,
  • Hailiang Liu,
  • Mingmin Zhang,
  • Zhimin Zhang

摘要

Volcanic soil has been used as an alternative material in infrastructure construction, yet the friable nature of its particles poses significant engineering challenges. In this study, the repeated one-dimensional compression tests were conducted on volcanic soil with different particle groups and relative densities. The results showed that the soil stiffness, represented by the secant modulus (Esec), increased to 4 ~ 7 times its initial value after three load cycles. The relative breakage index (Br) ranged from 0.16 to 0.26 under the tested conditions, showing positive correlations with vertical stress, loading number, and particle size, and a negative correlation with relative density. The proposed predictive models for volumetric strain and breakage index showed that both parameters stabilized (RMSE < 2%) after more than 3 loading numbers. This study provides a theoretical basis for deformation and breakage assessment of volcanic soils for engineering applications as marginal materials.