An Investigation of Rainfall-Induced Landslides From the Pre-Failure Stage to the Post-Failure Stage Using the Material Point Method

Lee, Wei-Lin; Martinelli, Mario; Shieh, Chjeng-Lun

doi:10.3389/feart.2021.764393

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…Because of rainfall infiltration, various types of slope stability show failure phenomena, such as erosion, and can cause changes, such as different mass flow movements, depending on the slope morphology, characteristic soil curves, and the shear strength involved. The complicated linkages between rainfall circumstances, pore water pressure, soil strength, safety variables, and movement rates have been revealed (Lee et al, 2021).…”

Section: Rainfallmentioning

confidence: 99%

The Effect of Extreme Rainfall Events on Riverbank Slope Behaviour

Taib

Razali

et al. 2022

Front. Environ. Sci.

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Many slope failures take place during or after rainfall events. Landslides are one of the tragedies associated with slope failures and often lead to fatal accidents. A study on the effects of extreme rainfall on slope stability considering the historical rainfall data, slope characteristics and properties, and flow boundary conditions was undertaken. This study investigated the behaviour of the Sg Langat slope under the influence of extreme rainfall gathered from historical data. Sg Langat was selected as the research area because of its high riverbank failures. The focus of this study are as follows: 1) to determine the effect of slope angles on slope stability, 2) to assess the development of pore-water pressure based on the changing groundwater levels, and 3) to analyse the influence of extreme rainfall events on the slope behaviour via numerical modelling. This study enhances the understanding of certain slope conditions and contributes to the analysis of slope stability through numerical modelling, making it relatively convenient to observe the soil conditions for determining the slope stability of the research area in regards to the effect of extreme rainfall. The results were obtained with respect to the changes in the pore-water pressure and the factor of safety. It was observed that the pressure changes were different for every channel, demonstrating that the generation of negative pore-water pressure was not directly affected by the type of analysis and the rainfall infiltration alone. Moreover, the slopes on all channels presented were considered unstable because of the considerable changes in the negative pore-water pressure at a relatively shallow depth, causing soil strength reduction. The factor of safety recorded for Channel 1 was the lowest at 0.18, whereas Channel 3 had the highest factor of safety of 1.11 but was still considered unsafe as it fell below the standard safety margin of 1.3. Apart from the different rainfall intensities applied, the geometry of the slopes also affected the slope stability.

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Section: Rainfallmentioning

confidence: 99%

The Effect of Extreme Rainfall Events on Riverbank Slope Behaviour

Taib

Razali

et al. 2022

Front. Environ. Sci.

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“…Since the temporal and spatial resolutions of displacement and moving direction are rough and rare, numerical simulation (i.e., MPM simulation) could be a feasible solution. MPM simulation has been widely applied in simulating landslide behavior with significant advancements, accurately capturing the behavior of slope failure and the internal deformation of the slope [6][7][8][9]. MPM simulation can be applied to simulate the landslide behavior and provide the elaborate ground surface data evolution simultaneously, which can be used to evaluate the performance of Carter method.…”

Section: Introductionmentioning

confidence: 99%

Research on the Carter Method for the location of sliding surfaces based on a numerical study

Lin,

Lu,

Novanti

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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In order to investigate the potential location and magnitude of a landslide, the information regarding the location and shape of the sliding surface is important. However, obtaining such information through underground investigations is costly and time-consuming. A method proposed by Carter and Bentley (1985) provides an approach to predict the sliding surface based on ground surface information. With help of advanced techniques such as UAVs and SAR satellites, Carter’s method has been utilized in field sites of potential landslide areas recently. Geophysical surveys and drilling data are commonly used validation data, but the temporal and spatial resolutions of these data are rough and rare. For this problem, this study generated high temporal and spatial resolution data of landslide behaviour by a physically based model and these data were utilized to investigate the capability and limitations of Carter’s method. Firstly, a scenario of slope failure on a 30-degree slope was performed by a numerical model using the material point method (MPM). Next, Carter’s method was applied to predicted the sliding surface using ground surface data obtained from the MPM simulation, and the results were compared with the sliding surface data from the MPM simulation. Finally, we perform an error analysis using the concordance correlation coefficient (CCC) to assess the reliability of Carter’s method. The findings of this study contribute to understanding the capabilities and limitations of Carter’s method in landslide analysis and provide insights for improving landslide risk assessment and mitigation strategies.

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“…Then, the increase in pore water pressure is proportional to the rainfall amount until the cumulative rainfall exceeds the maximum water storage capacity of the soil layer [19]. Under excess rainfall, large and fast-rising pore water pressure may be observed [6,7,13,[21][22][23][24]. If interstitial air can leak out of the soil layer freely, then high-intensity rainfall leads to the development of a wetting front with fully saturated conditions, and a suddenly ascending pore water pressure is triggered when the wetting front reaches the phreatic surface or impermeable layer [6,13,21,24].…”

Section: Introductionmentioning

confidence: 99%

“…Under excess rainfall, large and fast-rising pore water pressure may be observed [6,7,13,[21][22][23][24]. If interstitial air can leak out of the soil layer freely, then high-intensity rainfall leads to the development of a wetting front with fully saturated conditions, and a suddenly ascending pore water pressure is triggered when the wetting front reaches the phreatic surface or impermeable layer [6,13,21,24]. If the interstitial air is entrapped by the infiltrated water, then an increase in pore water pressure is caused by the compression of air before the wetting front reaches the phreatic surface or impermeable layer; this phenomenon is the well-known Lisse effect [7,22,23].…”

Section: Introductionmentioning

confidence: 99%

“…In numerical modeling, a single-phase flow model based on the Richards equation was utilized widely to simulate the unsaturated flow in porous media [5,15]. The change in pore water pressure might be affected by the interstitial air, i.e., the Lisse effect, which is why the two-phase flow model was developed to simulate the dynamic behavior of pore air and its impacts on the pore water pressure [6,11,12,18,24,29]. To investigate the impacts of changes in pore water/air pressure on the slope stability, the limit equilibrium method evolved in the single-/two-phase flow model [18,30,31].…”

Section: Introductionmentioning

confidence: 99%

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A Preliminary Study of the Seepage Hammer Effect and Its Impacts on the Stability of Layered Infinite Slope

Lee

Tai

Shieh

et al. 2023

Water

Self Cite

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A rapid change in the pore water pressure of unsaturated soil due to a wetting front is a crucial factor and may result in instabilities in layered slopes. This study presents preliminary research on such a change, which we define as the seepage hammer effect. Vertical infiltration with multiple soil layers by column test was implemented to investigate the mechanism of the seepage hammer effect and distinguish it from the well-known Lisse effect and reverse Wieringermeer effect. A two-phase flow model was utilized to understand the evolutions of pore water/air pressure and volumetric water content, and its result evolved into a layered infinite slope stability analysis. Thus, the impacts of the seepage hammer effect on slope stability can be analyzed. This study found that the seepage hammer effect was triggered when the wetting front reached the interface of multiple layers and impermeable layers, and the rising speed of pore water pressure was proportional to the air venting capacity of soil. Slope stability analysis showed that the safety factor may decline suddenly because of the seepage hammer effect. Its relationship with the factor of safety and the sliding velocity is proportional. The detection of the seepage hammer effect could be a potential application of the study of fast-moving landslides.

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An Investigation of Rainfall-Induced Landslides From the Pre-Failure Stage to the Post-Failure Stage Using the Material Point Method

Cited by 12 publications

References 28 publications

The Effect of Extreme Rainfall Events on Riverbank Slope Behaviour

The Effect of Extreme Rainfall Events on Riverbank Slope Behaviour

Research on the Carter Method for the location of sliding surfaces based on a numerical study

A Preliminary Study of the Seepage Hammer Effect and Its Impacts on the Stability of Layered Infinite Slope

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