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<p>The mechanical behavior of coarse-grained soils is strongly influenced by particle shape and breakage, particularly under the high-stress conditions characteristic of large-scale geotechnical structures, where the extent of breakage is primarily controlled by particle mineralogy and morphology. To explore the interplay between particle shape and breakage, as well as their coupled effect on mechanical behavior, this work first generated three types of coarse-grained soils differing solely in angularity by using an abrasion method. Subsequently, a series of drained triaxial compression tests was performed on these materials. The results indicate that particle breakage increases with particle angularity and their combined influences on the mechanical properties of coarse-grained soils exhibit a pronounced stress-state dependence. The peak friction angle and the maximum dilation angle both increase as angularity rises. However, the differences between materials with varying angularity gradually decrease with increasing confining pressure. Furthermore, the dilation parameter in Bolton’s stress–dilatancy equation increases with angularity, while the intercept representing the critical state angle shows no significant difference. In the <i>e</i>&#xa0;−&#xa0;<i>p</i>′ space, the critical state line (CSL) for samples with higher angularity exhibits a greater slope and intercept while the CSL crossover occurs under different particle angularity as the mean effective stress increases. These findings provide meaningful insights for the selection and engineering design of coarse-grained materials in applications.</p>

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Coupled effect of particle shape and particle breakage on strength–dilatancy and critical state behaviors of coarse-grained soils

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Gengyao Cui,
  • Degao Zou,
  • Fanwei Ning,
  • Jingmao Liu,
  • Duo Li,
  • Shanlin Tian,
  • Musen Han

摘要

The mechanical behavior of coarse-grained soils is strongly influenced by particle shape and breakage, particularly under the high-stress conditions characteristic of large-scale geotechnical structures, where the extent of breakage is primarily controlled by particle mineralogy and morphology. To explore the interplay between particle shape and breakage, as well as their coupled effect on mechanical behavior, this work first generated three types of coarse-grained soils differing solely in angularity by using an abrasion method. Subsequently, a series of drained triaxial compression tests was performed on these materials. The results indicate that particle breakage increases with particle angularity and their combined influences on the mechanical properties of coarse-grained soils exhibit a pronounced stress-state dependence. The peak friction angle and the maximum dilation angle both increase as angularity rises. However, the differences between materials with varying angularity gradually decrease with increasing confining pressure. Furthermore, the dilation parameter in Bolton’s stress–dilatancy equation increases with angularity, while the intercept representing the critical state angle shows no significant difference. In the e − p′ space, the critical state line (CSL) for samples with higher angularity exhibits a greater slope and intercept while the CSL crossover occurs under different particle angularity as the mean effective stress increases. These findings provide meaningful insights for the selection and engineering design of coarse-grained materials in applications.