A slope stability analysis method considering the rainfall hydrology process

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL Engineering Geology Pub Date : 2024-10-28 DOI:10.1016/j.enggeo.2024.107775

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引用次数: 0

Abstract

Rainfall is one of the major factors inducing landslides. Stability analysis of the slope under the rainfall process is very important for disaster prevention and control. As a hybrid Lagrangian-Eulerian computational method, the material point method (MPM) is highly suitable for simulating the large deformation processes of geomaterials. By using a GPU-based MPM software (CoSim-MPM), a novel coupling method between the rainfall hydrology process and geomechanics is provided to analyze the influence of the rainfall on slope stability. The provided method considers both the influence of surface runoff and infiltration during the rainfall, and is able to simulate the whole process of water migration, deformation and failure of the slope. To perform the quantitative analysis of slope stability during the rainfall process, the strength reduction method (SRM) is introduced. And Qianling slope, Beijing, China, is taken as an application example, which was unstable during an intense rainfall in 2023. Based on the numerical results and field investigations, the mechanisms of slope deformation and failure under rainfall is analyzed. The results indicate that the provided method has robust advantages and efficiency in slope stability analysis during the rainfall, which can give an intuitive and comprehensive simulation of the entire process of slope deformation and failure.

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考虑降雨水文过程的斜坡稳定性分析方法

降雨是诱发山体滑坡的主要因素之一。降雨过程下的边坡稳定性分析对于灾害防治非常重要。作为一种拉格朗日-欧拉混合计算方法，材料点法（MPM）非常适合模拟土工材料的大变形过程。通过使用基于 GPU 的 MPM 软件（CoSim-MPM），提供了一种降雨水文过程与地质力学之间的新型耦合方法，用于分析降雨对边坡稳定性的影响。所提供的方法同时考虑了降雨过程中地表径流和渗透的影响，能够模拟边坡的水迁移、变形和破坏的全过程。为了对降雨过程中的边坡稳定性进行定量分析，引入了强度降低法（SRM）。以中国北京的前岭边坡为例，该边坡在 2023 年的强降雨过程中出现不稳定。基于数值结果和实地调查，分析了降雨作用下边坡变形和破坏的机理。结果表明，所提供的方法在降雨过程中的边坡稳定性分析中具有强大的优势和效率，可以直观、全面地模拟边坡变形和破坏的全过程。

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来源期刊

Engineering Geology 地学-地球科学综合

CiteScore

13.70

自引率

12.20%

发文量

327

审稿时长

5.6 months

期刊介绍： Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.