Effects of Two-Phase Flow of Water and Air on Shallow Slope Failures Induced by Rainfall: Insights from Slope Stability Assessment at a Regional Scale

Kang, Sinhang; Cho, Sung-Eun; Kim, Byung-Min; Go, Gyu-Hyun

doi:10.3390/w12030812

Cited by 8 publications

(6 citation statements)

References 49 publications

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“…The depths from the ground surfaces to slope failure surfaces observed during our field investigation are generally shallow and comparable, with a range of 1-3 m, which is associated with Korea (Kim et al 2004). We assumed that the soil depth was uniform at 2 m and that the ground was isotropic and homogeneous (Kang et al 2020). We modeled infinite slopes with a length of 10 m considering the slope angle at each cell of the slope raster computed from the DEM.…”

Section: Slope Geometry and Initial And Boundary Conditionsmentioning

confidence: 99%

Effects of coupled hydro-mechanical model considering dual-phase fluid flow on potential for shallow landslides at a regional scale

Kang

Kim

2021

Nat Hazards

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A total of 36 rainfall-induced shallow landslides occurred on July 26 and 27, 2011, on Halmidang Mountain, Gyeonggi Province, South Korea. To precisely analyze these shallow landslides, a coupled hydro-mechanical model is applied that considers the dual-phase fluid flow of water and air and the deformation-dependence of the water retention behavior with hydraulic hysteresis. The changes in the pore pressures and saturations of the water and air are obtained from an infiltration analysis and are used to calculate the safety factor in a slope stability assessment. A comparison of the results from single-and dual-phase flow models is used to investigate the effects on the slope stability of the air flow and variations in the hydraulic conductivity resulting from the stress-strain behavior. The results suggest that considering the air flow in the hydro-mechanical coupling affects the increase rate of the pore water pressure, thus influencing the safety factor when ponding is more likely to occur during heavy rainfall. Finally, landslide assessments are conducted using the dual-phase flow model, which is slightly more consistent with actual landslide events than the single-phase flow model.

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Section: Slope Geometry and Initial And Boundary Conditionsmentioning

confidence: 99%

Effects of coupled hydro-mechanical model considering dual-phase fluid flow on potential for shallow landslides at a regional scale

Kang

Kim

2021

Nat Hazards

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“…Where In soil engineering, the infinite slope model is used to evaluate the slope stability affected by soil-water infiltration (Phoon, 2008). Biondi et al (2000) introduced the equation of infinite slope that is widely used in slope stability studies (Travis et al, 2009;Griffiths et al, 2011;Kang et al, 2020). The infinite stability method assumes homogeneous properties of the soil where fractures occur.…”

Section: Rainfall Thresholdmentioning

confidence: 99%

Slope stability estimation using a Danger Level approach for monitoring landslide prone areas

Reli¹,

Yusoff²,

Ujang³

2021

GEOGRAFIA

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Slope stability evaluation is an essential element in assessing landslide hazards and ensuring the safe design of structures and infrastructure. There has been increased awareness of the need to give greater attention to these phenomena. However, there is no general rule for classifying safety factors of the slope. The factor of safety (FOS) is used globally to determine slope stability by identifying shear strength and shear stress. However, the FOS cannot become the only assessment to evaluate slope stability. This research focuses more on the infiltration of soil-water that reduces the strength of slopes based on the danger level (DL). DL is divided into four categories: low, moderate, high, and very high. To estimate slope stability, four main locations are set on the slope: P1 (highest point), P2, P3 and P4 (lowest point). The DL value is determined using FOS, a rainfall threshold, soil-water infiltration, and soil classification. The DL value for P1 is 0.567 (moderate risk), while the DL values for P2, P3, and P4 are 0.116, 0.073, and 0.095 (very high risk), respectively, indicating that this slope is hazardous. Determining hazardous slope points will be easier, as DL has classified specific slope locations with exact risk values.

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“…Shallow slope failures caused by rainfall can be interpreted by the infinite slope analysis method because the failure surface is usually parallel to the slope surface [4]. In this study, the limit equilibrium method was applied to the infinite slope to calculate the safety factor considering that the surface of shallow slope failure tends to be parallel to the slope surface in Korea [50]. Figure 3 exhibits a conceptual diagram of an infinite slope with a shallow impermeable layer.…”

Section: Slope Stability Analysismentioning

confidence: 99%

Slope Stability Analysis of Unsaturated Soil Slopes Based on the Site-Specific Characteristics: A Case Study of Hwangryeong Mountain, Busan, Korea

2020

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Shallow slope failures occur almost every year during the rainy season. Continuous observation of the meteorological parameters and hydrological characteristics is required to more clearly understand the triggering mechanisms of shallow slope failure. In addition, influential factors, such as type of relative permeability models, air flow, and variation of hydraulic conductivity associated with stress–strain behavior of soil, have significant effects on the actual mechanism of rainfall infiltration. Real-time data including hourly rainfall and pore water pressure in response to rainfall was recorded by devices; then, the change in pore pressure from the devices was compared to the results from the infiltration analysis with applications of three relative permeability models, air flow, and the coupled hydro-mechanical analysis to examine an appropriate site-specific approach to a rainfall infiltration analysis. The infiltration and stability analyses based on the site-specific hydrologic characteristics were utilized to create maps of safety factors that depend on the cumulative rainfall. In regions vulnerable to landslides, rainfall forecast information and safety factor maps built by applying various rainfall scenarios can be useful in preparing countermeasures against disasters during the rainy season.

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Effects of Two-Phase Flow of Water and Air on Shallow Slope Failures Induced by Rainfall: Insights from Slope Stability Assessment at a Regional Scale

Cited by 8 publications

References 49 publications

Effects of coupled hydro-mechanical model considering dual-phase fluid flow on potential for shallow landslides at a regional scale

Effects of coupled hydro-mechanical model considering dual-phase fluid flow on potential for shallow landslides at a regional scale

Slope stability estimation using a Danger Level approach for monitoring landslide prone areas

Slope Stability Analysis of Unsaturated Soil Slopes Based on the Site-Specific Characteristics: A Case Study of Hwangryeong Mountain, Busan, Korea

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