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<p>Crack is one of the dominant factors affecting the stability of expansive soil slopes, which tend to act unfavorably upon slope stability. A series of centrifuge model tests were carried out investigate the performance of expansive soil slopes with different crack connectivity rates and crack inclination before and after humidification. The slope cracks were filled with strong expansive and glass drops, which yields high permeability and low strength of the cracked mass, and addresses the drawbacks of conventional crack simulation methods. Expansive soil slopes with diverse crack distribution patterns were generally stable under natural conditions. After humidification, however, slopes with higher crack connectivity rates show poorer stability. Specifically, the relative stability index of T1, T2, and T3 slopes were 0.9, 0.5, and 0.6, respectively. Sliding deformation occurred along the steeply inclined cracks at the slope crest. Increased crack connectivity intensifies the chain reaction of “shear stress concentration-directional accumulation of deformation-coordinated sliding”, speeding up the transition from local deformation to global slope failure. These results provide theoretical references for revealing the failure mechanism of cracked expansive soil slopes and mitigating relevant slope hazards.</p>

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Centrifugal model test on deformation evolution and failure mechanism of cracked expansive soil slopes under humidification

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Li Tianguo,
  • Yan Junbiao,
  • Kong Lingwei,
  • Zhou Zhenhua,
  • Xu Chuanyong

摘要

Crack is one of the dominant factors affecting the stability of expansive soil slopes, which tend to act unfavorably upon slope stability. A series of centrifuge model tests were carried out investigate the performance of expansive soil slopes with different crack connectivity rates and crack inclination before and after humidification. The slope cracks were filled with strong expansive and glass drops, which yields high permeability and low strength of the cracked mass, and addresses the drawbacks of conventional crack simulation methods. Expansive soil slopes with diverse crack distribution patterns were generally stable under natural conditions. After humidification, however, slopes with higher crack connectivity rates show poorer stability. Specifically, the relative stability index of T1, T2, and T3 slopes were 0.9, 0.5, and 0.6, respectively. Sliding deformation occurred along the steeply inclined cracks at the slope crest. Increased crack connectivity intensifies the chain reaction of “shear stress concentration-directional accumulation of deformation-coordinated sliding”, speeding up the transition from local deformation to global slope failure. These results provide theoretical references for revealing the failure mechanism of cracked expansive soil slopes and mitigating relevant slope hazards.