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<p>The characteristics of Coarse Grained-Sliding Zone (CG-SZ) soil have a substantial impact on landslide deformation; nonetheless, studies examining its shear spatial deformation remain limited. At present, the correlation between the experimental results and the simulation results regarding CG-SZ soil is relatively weak. This study employs graphite core probes and performs particle image velocimetry (PIV) and discrete element method (DEM) to examine CG-SZ soil, which consists of spheroidal and blade particles with four levels of coarse particle contents. PIV observations reveal that for spheroidal particles, the shear band thickness varies with increasing coarse particle content, ranging from 13&#xa0;mm to 18.1&#xa0;mm. For blade particles, the shear band thickness changes with the rise in coarse particle content, ranging from 11&#xa0;mm to 17.5&#xa0;mm. The average shear band thickness of blade particle samples (43.12&#xa0;mm) observed using graphite core probes is 17% greater than that of spheroidal particle samples. DEM analysis revealed that spheroidal particles exhibit a pronounced interlocking effect that leads to the formation of a stable coarse-grained skeleton structure, which in turn enhances the shear strength of spheroidal samples. Through energy analysis and the integration of experimental and simulation results, we classify the shearing process into four distinct stages: compaction, rapid damage, advantageous path development, and shear band penetration. The shear bands obtained using graphite core probes and PIV were analyzed, and the shear interface classified into main and secondary slip surfaces.</p>

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Influence of spheroidal and blade-shaped coarse particles on the shear evolution and spatial deformation of sliding zone soil

  • 期刊论文

  • 发表日期：

    2026年2月6日

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  • Zechuang Li,
  • Xiangyu Geng,
  • Han Zhang

摘要

The characteristics of Coarse Grained-Sliding Zone (CG-SZ) soil have a substantial impact on landslide deformation; nonetheless, studies examining its shear spatial deformation remain limited. At present, the correlation between the experimental results and the simulation results regarding CG-SZ soil is relatively weak. This study employs graphite core probes and performs particle image velocimetry (PIV) and discrete element method (DEM) to examine CG-SZ soil, which consists of spheroidal and blade particles with four levels of coarse particle contents. PIV observations reveal that for spheroidal particles, the shear band thickness varies with increasing coarse particle content, ranging from 13 mm to 18.1 mm. For blade particles, the shear band thickness changes with the rise in coarse particle content, ranging from 11 mm to 17.5 mm. The average shear band thickness of blade particle samples (43.12 mm) observed using graphite core probes is 17% greater than that of spheroidal particle samples. DEM analysis revealed that spheroidal particles exhibit a pronounced interlocking effect that leads to the formation of a stable coarse-grained skeleton structure, which in turn enhances the shear strength of spheroidal samples. Through energy analysis and the integration of experimental and simulation results, we classify the shearing process into four distinct stages: compaction, rapid damage, advantageous path development, and shear band penetration. The shear bands obtained using graphite core probes and PIV were analyzed, and the shear interface classified into main and secondary slip surfaces.