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<p>The occurrence of landslides is often a complex dynamic evolution process, characterized by multiple slide-stop-slide cycles. Each state transition may be associated with changes in the mechanical state and structure of the sliding zone soil, significantly influencing the overall stability of the landslide. Taking the sliding zone soil of Ertaizi gully landslide as test material, a series of repeated ring shear tests were conducted under different moisture contents (<i>Mc</i>), normal stresses (<i>σ</i><sub><i>n</i></sub>), and the number of shear cycles (<i>NSC</i>) to investigate the mechanical strength characteristics of the sliding zone soil during the process of repetitive motion landslides movement. The results indicate: (1) <i>Mc</i> critically influences the soil shear strength in the deep sliding zone, while increasing <i>NSC</i> diminishes the strain-softening phenomenon of soil. Additionally, the attenuation effect of <i>NSC</i> against shear strength actually weakens the cohesion of the soil. (2) An increase in <i>Mc</i> reduces soil looseness near the shear plane, while an increase in <i>σ</i><sub><i>n</i></sub> expands relatively flat region adjacent to the shear plane. Under shearing, soil particles align along the shearing direction, exhibiting a preferred orientation within 0~30°. (3) Although there is a healing mechanism at the shear plane, repetitive motion landslides remain highly hazardous. This research offers a theoretical basis for comprehending the effects of <i>Mc</i>, <i>σ</i><sub><i>n</i></sub>, and <i>NSC</i> on the mechanical strength and microstructural deformation properties of soil. Additionally, it provides guidance for predicting the stability of repetitive motion landslides.</p>

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Study on mechanical strength and microstructure deformation characteristics of landslide sliding zone soil based on repeated ring shear tests

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Haoyu Wang,
  • Xingang Wang,
  • Nan Zhang,
  • Lei Xue,
  • Chen Xue,
  • Kai Liu,
  • Yanjun Li

摘要

The occurrence of landslides is often a complex dynamic evolution process, characterized by multiple slide-stop-slide cycles. Each state transition may be associated with changes in the mechanical state and structure of the sliding zone soil, significantly influencing the overall stability of the landslide. Taking the sliding zone soil of Ertaizi gully landslide as test material, a series of repeated ring shear tests were conducted under different moisture contents (Mc), normal stresses (σn), and the number of shear cycles (NSC) to investigate the mechanical strength characteristics of the sliding zone soil during the process of repetitive motion landslides movement. The results indicate: (1) Mc critically influences the soil shear strength in the deep sliding zone, while increasing NSC diminishes the strain-softening phenomenon of soil. Additionally, the attenuation effect of NSC against shear strength actually weakens the cohesion of the soil. (2) An increase in Mc reduces soil looseness near the shear plane, while an increase in σn expands relatively flat region adjacent to the shear plane. Under shearing, soil particles align along the shearing direction, exhibiting a preferred orientation within 0~30°. (3) Although there is a healing mechanism at the shear plane, repetitive motion landslides remain highly hazardous. This research offers a theoretical basis for comprehending the effects of Mc, σn, and NSC on the mechanical strength and microstructural deformation properties of soil. Additionally, it provides guidance for predicting the stability of repetitive motion landslides.