Modeling of rainfall-induced landslides using a full-scale flume test

Lee, Kwangwoo; Suk, Jae-Wook; Kim, Hyunki; Jeong, Sangseom

doi:10.1007/s10346-020-01563-8

Cited by 30 publications

(19 citation statements)

References 32 publications

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“…The third type of previous investigations include studies about the initiation and the outcome of rainfall-triggered landslides and debris flows, or triggering effects of massive melting snow due to rapid temperature increase. Despite several surveys about natural events [22,24,26,[85][86][87] and field studies [13,19,31], laboratory experiments in artificial flumes equipped with sprinklers have been conducted over the years [88][89][90][91][92][93][94][95][96]. However, the complex interaction between rain and snow (rain falls on already melting snowpack, rainfall cannot be stored in snowpack and is rapidly percolated downwards), in particular, in combination with frozen soil, has been observed [24,33] but has been studied experimentally only rudimentarily thus far.…”

Section: Experimental Investigations and Field Measurementsmentioning

confidence: 99%

Rain, Snow and Frozen Soil: Open Questions from a Porescale Perspective with Implications for Geohazards

Baselt

Heinze

2021

Geosciences

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Climate change is already affecting high mountain regions, such as the European Alps. Those regions will be confronted with a significant rise of temperatures above the global average, and more and heavier rain events, also during wintertime. The system response to the coincidence of rain, snow, and possibly frozen soil depends on the almost infinite number of possible combinations of thermo-hydraulic states of the involved phases. Landslides, snow avalanches, debris flows, or extensive surface runoff are just a few of the possible hazardous outcomes. With rising temperatures and increased precipitation, those hazardous outcomes are expected to occur even more frequently in the future, requiring a better understanding of those coupled processes for hazard mitigation strategies. The macroscopic phenomena are controlled by porescale processes, such as water freezing and ice grains blocking pores, which are only barely understood. The strong coupling between thermal state and hydraulic parameters, the possible phase change, and material heterogeneity pose great challenges for investigation. This work provides an overview of documented hazard events regarding rain, snow, and possibly frozen soil. The current state in theoretical and experimental research is presented before several knowledge gaps are derived and possible techniques to address those gaps are discussed.

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Section: Experimental Investigations and Field Measurementsmentioning

confidence: 99%

Rain, Snow and Frozen Soil: Open Questions from a Porescale Perspective with Implications for Geohazards

Baselt

Heinze

2021

Geosciences

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“…Here, the model reproduced the dynamic interaction of complex fluid-particle-erosion-structure, and the study concluded that the slope and the solid-liquid ratio are positively correlated with erosion. Lee and Jeong [11], Lee et al [21], Jeong and Lee [25], and Lee et al [26] adopted the coupled Euler-Lagrange (CEL) method to compare the test results with the debris flow disasters that have occurred, verifying the applicability of the coupled numerical analysis method. Li et al [27], Liu et al [28], and Liu et al [29], respectively, adopted the coupled numerical methods SPH-DEM, SPH-FEM, and DEM-FEM to investigate the dynamic response of the debris flow process model and the retaining structure.…”

Section: Introductionmentioning

confidence: 96%

Study on Dynamic Response of Blocking Structure and Debris Flow Impulsive Force considering Material Source Erosion

Wang

2022

Lithosphere

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The erosion of debris flows on the material source will affect the movement and impact of the debris flow. This paper adopted the coupled SPH-DEM-FEM to establish a complex dynamic model of the particle-fluid-erosion-structure of the debris flow and to assess the impact of erosion and sedimentation and analyse the dynamic response of the retaining structure of the debris flow. The strain-softening model was adopted to simulate the transformation of the debris flow body from the solid state to the transition state and finally into the liquid state. The coupled numerical analysis completely reproduces the debris flow erosion test, fitting the debris flow shape and thickness profile well. The impact process of the debris flow, the impact height behind the retaining dam, the deposition thickness, and the debris flow dynamic response significantly influence both with and without considering the effects of erosion. The results of this study are similar to existing literature and data, with the numerical analysis being consistent with the physical simulation tests in the existing literature, verifying the applicability of the SPH-DEM-FEM coupling analysis for assessing the debris flow impact retaining structures of erosion and sedimentation. The study also found that the dynamic response considering the debris flow impact and the retaining structures of erosion and sedimentation is more pronounced than when not considering erosion and sedimentation. Coupled numerical analysis can assess the potential effect of erosion and sedimentation, making a significant contribution to the assessment of the impact of debris flow and the design of retaining structures.

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“…Such different mechanisms are caused by specific combinations of rainfall scenarios and slope conditions, such as slope angle, porosity and degree of saturation [33][34][35], and call for accurate characterization of their initiation and postfailure processes. However, current hypotheses as to the physical processes behind how precipitation initiates slope instabilities and subsequently dominates postfailure patterns are based mostly on in situ observations [15,32,38] and full-scale tests [17,27], which are generally costly and irreproducible. Although some efforts based on centrifuge model tests provide a basis to quantify the susceptibility to failure [16,22,46,49], none of them linked the initial slope conditions to the failure patterns of slopes under variable rainfall scenarios.…”

Section: Introductionmentioning

confidence: 99%

Centrifuge modelling of rainfall-induced slope failure in variably saturated soil

Wang

Idinger

2021

Acta Geotech.

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This paper presents the results of centrifuge tests on rainfall-induced instabilities in variably saturated slopes. The roles of rainfall intensity and initial conditions, such as slope angle, porosity and degree of saturation of the soil, in the failure initiation and postfailure kinematics are considered. The failure patterns, infiltration profile and deformation at prefailure and postfailure stages are characterized. The results indicate that rainfall-induced slope failures usually follow one of the following two failure modes, i.e. slide-to-flow and flowslide failure modes. The former pattern is characterized by soil mass flow after initial failure along a continuous shear surface, while the latter is more relevant to the rapid increase in the saturation at the slope surface, resulting in surface erosion channels followed by the acceleration of the soil mass. The flowslide failure pattern usually gives rise to several superficial shear surfaces and longer run-out distances. The rainfall intensity and profiles of the degree of saturation play the key roles in initiating the slope failure at the prefailure stage and subsequently in mobilizing the soil mass at the postfailure stage. Our test data, together with the data from the literature, are presented in two threshold curves to define the critical condition of slope failure under rainfall infiltration.

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Modeling of rainfall-induced landslides using a full-scale flume test

Cited by 30 publications

References 32 publications

Rain, Snow and Frozen Soil: Open Questions from a Porescale Perspective with Implications for Geohazards

Rain, Snow and Frozen Soil: Open Questions from a Porescale Perspective with Implications for Geohazards

Study on Dynamic Response of Blocking Structure and Debris Flow Impulsive Force considering Material Source Erosion

Centrifuge modelling of rainfall-induced slope failure in variably saturated soil

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