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Slope stability considering multi-fissure seepage under rainfall conditions
Jianqing Jia1, Chengxin Mao2, Victor O Tenorio3
1School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou, 730070, China. 19427431@qq.com.
Scientific Reports
|May 22, 2024
Summary
Fissures significantly impact slope stability by accelerating rainwater infiltration. Considering multi-fissure seepage increases pore water pressure and affects slope displacement and stability over time.
Area of Science:
- Geotechnical Engineering
- Hydrogeology
- Environmental Science
Background:
- Fissures in soil slopes act as preferential pathways for rainwater infiltration.
- This infiltration significantly alters the slope's seepage field and overall stability.
- Understanding these effects is crucial for landslide risk assessment and mitigation.
Purpose of the Study:
- To investigate the impact of multi-fissure seepage on slope stability.
- To analyze the evolution of seepage, displacement, and stress within a fissured slope under rainfall conditions.
- To validate a fluid-structure coupling model with field monitoring data.
Main Methods:
- Equivalent permeability coefficient method to homogenize fissured soil.
- Development of a saturated-unsaturated seepage fluid-structure coupling model.
- Analysis of rainfall infiltration and groundwater level boundary conditions.
Main Results:
- Multi-fissure seepage accelerates pore water pressure and water content rise in topsoil.
- Higher pore water velocities are observed within fissure seepage zones.
- The influence of multi-fissure seepage diminishes with increased depth and proximity to the groundwater level.
- Slope displacement predictions from the model align well with field observations.
- Increasing rainfall duration progressively reduces the slope stability coefficient.
Conclusions:
- Multi-fissure seepage is a critical factor influencing slope hydrology and stability.
- The established fluid-structure coupling model accurately simulates slope behavior under rainfall.
- Rainfall infiltration significantly degrades slope stability over time, necessitating careful monitoring and management.
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