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<p>As one of the most frequent natural disasters in the northwest of China, soil slope collapse seriously threatens the life and property safety of residents, especially when exposed to heavy rainfall. In this study, the basic physical parameters of the soil collected from the field of Kapo in Wensu County were investigated through indoor experiments, and the effects of cracks on slope stability were analyzed. Based on the principle of fluid–solid coupling theory, finite element numerical simulation was used to capture the damage mechanism of slopes affected by cracks, and rainfall intensity and crack depth were identified as key parameters. The results show that there is an inverse relationship between rainfall intensity and crack depth. The factor of safety (FS) of the landslide gradually decreased from 1.051 to 0.956 as the rainfall intensity increased. The plastic zone extended from the foot of the slope to the top of the slope as the crack depth increased from 0&#xa0;m to 6.0&#xa0;m, which was associated with a decrease in the FS value. The study shows that crack depth and daily rainfall intensity are the determining factors for the occurrence of overtopping slumps. Among them, the crack depth generally controls the instability and damage pattern of the slope, while the rainfall intensity accelerates the damage process of the landslide hazard. It was also verified that crack depth promotes softening and seepage of soil slopes, while rainfall deepens the cracks and triggers the occurrence of collapse disasters.</p>

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Effect of Cracks on Soil Slope Stability under Different Rainfall Intensities

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Shengdong Cai,
  • Zizhao Zhang,
  • Xinyu Liu,
  • Qianli Lv,
  • Runsen Lai,
  • Xiaolong Yang

摘要

As one of the most frequent natural disasters in the northwest of China, soil slope collapse seriously threatens the life and property safety of residents, especially when exposed to heavy rainfall. In this study, the basic physical parameters of the soil collected from the field of Kapo in Wensu County were investigated through indoor experiments, and the effects of cracks on slope stability were analyzed. Based on the principle of fluid–solid coupling theory, finite element numerical simulation was used to capture the damage mechanism of slopes affected by cracks, and rainfall intensity and crack depth were identified as key parameters. The results show that there is an inverse relationship between rainfall intensity and crack depth. The factor of safety (FS) of the landslide gradually decreased from 1.051 to 0.956 as the rainfall intensity increased. The plastic zone extended from the foot of the slope to the top of the slope as the crack depth increased from 0 m to 6.0 m, which was associated with a decrease in the FS value. The study shows that crack depth and daily rainfall intensity are the determining factors for the occurrence of overtopping slumps. Among them, the crack depth generally controls the instability and damage pattern of the slope, while the rainfall intensity accelerates the damage process of the landslide hazard. It was also verified that crack depth promotes softening and seepage of soil slopes, while rainfall deepens the cracks and triggers the occurrence of collapse disasters.