Numerical modeling of seepage and deformation of unsaturated slope subjected to post-earthquake rainfall

Xu, Jiawei; Ueda, Kyohei; Uzuoka, Ryosuke

doi:10.1016/j.compgeo.2022.104791

Cited by 22 publications

(5 citation statements)

References 84 publications

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“…The study found that when the reservoir suddenly draws water from a large area, the stability of the slope will be significantly reduced. Xu et al [20] studied the seepage and deformation of unsaturated slopes during rainfall after an earthquake. They found that earthquakes significantly affect the sliding surface of slopes affected by rains, leading to more severe landslides.…”

Section: Introductionmentioning

confidence: 99%

Study on Fluid–Solid Coupling Numerical Simulation and Early Warning of Weathered Granite Landslides Induced by Extreme Rainfall

Peng

Liu

et al. 2023

Sustainability

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Rainfall is the main factor inducing landslides. Clarifying rainfall-induced landslides’ mechanisms and establishing adequate warning and prevention measures are crucial for regional disaster prevention and sustainable development. The weathering degree of fully weathered granite slopes is high, and the engineering mechanics property is poor, so it is easy to lose stability under extreme rainfall conditions. In this paper, the Fanling fully weathered granite landslide in Laoshan Scenic Spot in eastern China is taken as the research object, and the fluid–solid coupling landslide numerical model is established using ABAQUS 2022. The numerical simulation is carried out under five different rainfall intensity and time conditions, and the seepage field response, deformation response, and stability of the slope are analyzed. The research results indicate that (1) the fully weathered granite landslide in Fanling is a thrust-type landslide, and the response of horizontal deformation is greater than that of vertical deformation. (2) Compared with a long-term small rainstorm, a short-term heavy rainstorm is more harmful, and the slope is more prone to instability and damage. (3) The established unstable and under-stable rainfall warning curves for fully weathered granite landslides can provide a reference for the warning and prevention of similar regional landslides.

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Section: Introductionmentioning

confidence: 99%

Study on Fluid–Solid Coupling Numerical Simulation and Early Warning of Weathered Granite Landslides Induced by Extreme Rainfall

Peng

Liu

et al. 2023

Sustainability

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“…The increasing need of predicting current and future landslide risks has inspired a growing body of literature emphasising the link between pore water pressure rise and landslide motion. Notable examples are numerical analyses based on the Finite Element Method (FEM) (e.g., [10][11][12][13] ) as well as techniques such as the Material Point Method (MPM) (e.g., [14][15][16] ) and Smoothed Particle Hydrodynamics (SPH) (e.g., [17][18][19] ) which provide benefits for the study of high mobility events. In these methods, coupled hydro-mechanical formulations enable the quantification of landslide displacements as an outcome of pore pressure increase and soil strength deterioration.…”

Section: Introductionmentioning

confidence: 99%

Modelling seasonal landslide motion: Does it only depend on fluctuations in normal effective stress?

Rollo,

Buscarnera

2023

Num Anal Meth Geomechanics

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Landslide motion is often simulated with interface‐like laws able to capture changes in frictional strength caused by the growth of the pore water pressure and the consequent reduction of the effective stress normal to the plane of sliding. Here it is argued that, although often neglected, the evolution of all the 3D stress components within the basal shear zone of landslides also contributes to changes in frictional strength and must be accounted for to predict changes in seasonal velocity. For this purpose, an augmented sliding‐consolidation model is proposed which allows for the computation of excess pore pressure development and downslope sliding with any constitutive law with 3D stress evolution. Simulations of idealised infinite slope models subjected to hydrologic forcing are used to study the role of in‐situ stress conditions and stress rate multiaxiality. Specifically, a Drucker‐Prager perfectly plastic model is used to replicate frictional failure and shear deformation at the base of landslides. The model reveals that conditions amenable to the shearing of a frictional interface are met only after numerous rainfall cycles, that is, when multiaxial stress rates are suppressed. In this case, the landslide is predicted to move through a seasonal ratcheting controlled only by the effective stress component normal to the plane of sliding. By contrast, in newly formed landslides, the multiaxial stress evolution is found to produce further regimes of motion, from plastic shakedown to cyclic failure, neither of which can be captured by interface‐like frictional laws. Notably, the model suggests that a transition across these regimes can emerge in response to an aggravation of the magnitude of forcing, implying that (i) fluctuations in climate may alter the seasonal trends of motion observed today; (ii) our ability to quantify landslide‐induced risks is impaired unless proper geomechanical models are used to examine their long‐term dynamics.

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“…In addition, the numerical simulation technique is widely used in the analysis of slope stability, compared with physical model tests. This is because this technique not only reproduces the soil-structure interaction but also simulates the slope failure under various conditions, such as rainfall [18][19][20], earthquakes [21][22][23][24][25], human activity [26][27][28], etc. For example, Yin et al [29] simulated the Wangjiayan landslide during the 2008 Wenchuan earthquake using the Fast Lagrangian Analysis of Continua in Three Dimensions (FLAC3D) program.…”

Section: Introductionmentioning

confidence: 99%

Slope Stability and Effectiveness of Treatment Measures during Earthquake

Zhou

Wang

et al. 2023

Sustainability

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Slopes are prone to instability during earthquakes, which will cause geological disasters such as landslides and pose a great threat to people’s lives and property. Therefore, it is necessary to analyze the stability of slopes and the effectiveness of treatment measures during earthquakes. In this study, an actual slope in the creeping slide stage was selected and located in an area where earthquakes occur frequently. Once the slope experiences instability, it will produce great damage. Therefore, a finite difference program, Fast Lagrangian Analysis of Continua in Two Dimensions (FLAC2D), was employed in the numerical simulation to explore the stability of the slope before and after treatment under earthquake action. Different from previous studies, this study explores the effectiveness of various treatment measures on slope stability during earthquake. The computed results show that the stability of the slope is greatly influenced by earthquakes, and the slope displacement under seismic conditions is far larger than that under natural conditions. Three treatment measures, including excavation, anti-slide piles, and anchor cables, can significantly reduce slope displacement and the internal force on anti-slide piles, and improve the stability of a slope during an earthquake. This will provide a valuable reference for the strengthening strategies of unstable slopes. The analysis technique as well as the derived insights are of significance for slope stability and the effectiveness of treatment measures.

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Numerical modeling of seepage and deformation of unsaturated slope subjected to post-earthquake rainfall

Cited by 22 publications

References 84 publications

Study on Fluid–Solid Coupling Numerical Simulation and Early Warning of Weathered Granite Landslides Induced by Extreme Rainfall

Study on Fluid–Solid Coupling Numerical Simulation and Early Warning of Weathered Granite Landslides Induced by Extreme Rainfall

Modelling seasonal landslide motion: Does it only depend on fluctuations in normal effective stress?

Slope Stability and Effectiveness of Treatment Measures during Earthquake

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