Drag Force Effect of Surface Runoff on Stability of Shallow Soil Slope

Ye, Fei; Fu, Wei; Yuan, Xingyu; Xiang, Y

doi:10.1007/s11204-019-09563-0

Cited by 8 publications

(1 citation statement)

References 16 publications

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“…Meanwhile, increasing studies have focused on the impact of runoff on rainfall thresholds [28,29]. The influence of slope runoff at the fluid-solid interface should be considered [30]. The lateral runoff affects the cumulative seepage flow and head pressure of the slope [31].…”

Section: Introductionmentioning

confidence: 99%

Effect of Vegetation Roots on the Threshold of Slope Instability Induced by Rainfall and Runoff

2021

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Although vegetation is increasingly used to mitigate landslide risks, how vegetation roots affect the landslide threshold of slope has rarely been explored, particularly in the case of lateral runoff. In this study, we established a two-dimensional saturated-unsaturated infiltration equation considering the hydraulic effects of vegetation roots. The analytical solution for the shallow unsaturated two-dimensional coupled infiltration of vegetated slope (VS) was obtained by a Fourier transform technique. The numerical method was used to evaluate the stability of VS caused by four root architectures, the rainfall amount, and the rainfall duration. Subsequently, the transformation law in runoff, vegetation evaporation, and landslide threshold was analyzed. The results indicate that the factor of safety (FOS) increases with increasing drying time and decreases with increasing depth; the minimum FOS is at the junction of the root-rootless zone. Runoff and vegetation evaporation are favorable for the shallow stability of VS. The time of the safe area is 35 h for rainfall amount 500 m in the uniformly root clay slope. Moreover, four landslide threshold curves that reflected the root architecture, rainfall amount, and rainfall duration are developed, which are more realistic than those created using one-dimensional instability modeling.

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Section: Introductionmentioning

confidence: 99%

Effect of Vegetation Roots on the Threshold of Slope Instability Induced by Rainfall and Runoff

2021

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Flow field analysis and particle erosion of tunnel‐slope systems under coupling between runoff and fast (slow) seepage

Zhang,

Song,

Zhang

et al. 2023

Deep Underground Science and Engineering

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The presence of particles on the surface of a tunnel slope renders it susceptible to erosion by water flow, which is a major cause of soil and water loss. In this study, a nonlinear mathematical model and a mechanical equilibrium model are developed to investigate the distribution of flow fields and particle motion characteristics of tunnel slopes, respectively. The mathematical model of flow fields comprises three parts: a runoff region, a highly permeable soil layer, and a weakly permeable soil layer. The Navier‒Stokes equation controls fluid motion in the runoff region, while the Brinkman‐extended Darcy equation governs fast and slow seepage in the highly and weakly permeable soil layers, respectively. Analytical solutions are derived for the velocity profile and shear stress expression of the model flow field under the boundary condition of continuous transition of velocity and stress at the fluid‒solid interface. The shear stress distribution shows that the shear stress at the tunnel‐slope surface is the largest, followed by the shear stress of the soil interface, indicating that particles in these two locations are most vulnerable to erosion. A mechanical equilibrium model of sliding and rolling of single particles is established at the fluid‒solid interface, and the safety factor of particle motion (sliding and rolling) is derived. Sensitivity analysis shows that by increasing the runoff depth, slope angle, and soil permeability, the erosion of soil particles will be aggravated on the tunnel‐slope surface, but by increasing the particle diameter, particle‐specific gravity, and particle stacking angle, the erosion resistance ability of the tunnel‐slope surface particles will be enhanced. This study can serve as a reference for the analysis of surface soil and water loss in tunnel‐slope systems.

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The “8·21” rainfall-induced Zhonghaicun landslide in Hanyuan County of China: surface features and genetic mechanisms

Zhou

et al. 2021

Landslides

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Drag Force Effect of Surface Runoff on Stability of Shallow Soil Slope

Cited by 8 publications

References 16 publications

Effect of Vegetation Roots on the Threshold of Slope Instability Induced by Rainfall and Runoff

Effect of Vegetation Roots on the Threshold of Slope Instability Induced by Rainfall and Runoff

Flow field analysis and particle erosion of tunnel‐slope systems under coupling between runoff and fast (slow) seepage

The “8·21” rainfall-induced Zhonghaicun landslide in Hanyuan County of China: surface features and genetic mechanisms

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