Abstract Rainfall-induced shallow landslides are widely concerned for their sudden and group occurrences and serious threat to both lives and property. In this study, a hydraulic model coupling surface runoff and interstitial flow was established to study the failure characteristics of soil slopes under heavy rainfall. Based on the coupling of surface runoff and interstitial flow, we propose a modified failure mode for shallow soil slopes. In this mode, the safety factor of the shallow soil slope is derived, while the shear force acting on the slope from surface runoff is considered, as well as the resistance from the upper and lower edges of the sliding body. Compared with the classical infinite slope failure mode, the safety factor obtained by the method proposed herein is slightly larger. Additionally, the drag effect of runoff contributed positively to slope failure, and the safety factor decreased by approximately 7% while considering the drag force in slope stability analysis. Finally, theoretical analysis is verified by simulation experiments, and the results indicate good agreement between calculated and test values for failure shape and critical runoff depth.

中文翻译：

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考虑地表径流和填隙流的浅层土坡破坏特性

摘要 降雨引起的浅层滑坡具有突发性、群发性，严重威胁生命财产安全，受到广泛关注。本研究建立了地表径流与间隙流耦合的水力模型，研究了强降雨条件下土体边坡的破坏特性。基于地表径流和间隙流的耦合，我们提出了一种改进的浅土边坡破坏模式。该模式推导了浅层土边坡的安全系数，同时考虑了地表径流作用在边坡上的剪力，以及滑动体上下边缘的阻力。与经典的无限边坡破坏模式相比，本文提出的方法获得的安全系数略大。此外，径流的拖曳效应对边坡破坏有积极贡献，边坡稳定性分析考虑拖曳力时，安全系数下降约7%。最后，通过模拟实验验证了理论分析，结果表明破坏形状和临界径流深度的计算值与测试值之间具有良好的一致性。