Rapid assessment of regional superficial landslide under heavy rainfall

Fang, Wei; Esaki, Taito

doi:10.1007/s11771-012-1325-6

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…Due to infiltration of rainfall the moisture content is increased and the soil of slope cut and softened thereby increasing the sliding forces (Liu et al, 2013). The failure of slope induced by rainfall is mainly caused by (1) the weight of soil mass increased (2) with the increase in water content decrease in suction of unsaturated soil (3) increase in ground water level (4) erosion of slope surface and lubrication of sliding surface (5) hydrostatic or hydrodynamics pressure (Kitamura and Sako, 2010;Fang and Esaki, 2012).…”

Section: Literature Reviewmentioning

confidence: 99%

“…During the rainfall the pore pressure and seepage forces increased that causes the slope failure (Anderson and Sitar, 1995;Wang and Sassa, 2003). Due to increase in pore pressure the effective stress of soil decreases that reduce the shear strength, and in worst cases the slope failure occur (Fang et al, 2012). Before the rainfall the slope is in stable conditions, however after the rainfall the shear stress is increased, and shear strength of soil reduce due to increase in moisture content, that trigger the slope failure (Chae et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The higher rainfall intensity causes the slope failure in these cases and antecedent moisture has little influence on landslide occurrence (Johnson and Sitar, 1990). The main cause of the landslide is the rainfall especially for shallow landslide, as during the rainfall the bulk density of soil slope increased, softens the soil and reducing the stabilizing force of the soil (Fang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Laboratory experiments on rainfall-induced flowslide from pore pressure and moisture content measurements

Hakro

Harahap

2015

Preprint

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Abstract. During or immediately after rainfall many slope failures have been observed. The slope failure occurred due to rainfall infiltration that rapidly increase the pore pressure and trigger the slope failure. Numerous studies have been conducted to investigate the rainfall-induced slope failure, but the mechanism of slope failure is still not well clarified. To investigate mechanism of rainfall-induced slope failure laboratory experiments have been conducted in flume. The slope was prepared with sandy soil in flume with constant inclination of 45°, because most of rainfall-induced slope failure occurred in sandy soil and on steep slope. The hydrological parameters such as pore pressure and moisture content were measured with piezometers and advanced Imko TDRs respectively. The slope failure occurred due to increase in moisture content and rise in pore pressure. During the flowslide type of slope failure the sudden increase in pore pressure was observed. The higher moisture content and pore pressure was at the toe of the slope. The pore pressure was higher at the toe of the slope and smaller at the upper part of the slope. After the saturation the run-off was observed at the toe of the slope that erodes the toe and forming the gullies from toe to upper part of the slope. In the case antecedent moisture conditions the moisture content and the pore pressure increased quickly and producing the surface runoff at the horizontal part of the slope. The slope having less density suffer from flowslide type of the failure, however in dense slope no major failure was occurred even at higher rainfall intensity. The antecedent moisture accompanied with high rainfall intensity also not favors the initiation of flowslide in case of dense slope. The flowslide type of failure can be avoided by controlling the density of soil slope. Knowing such parameters that controls the large mass movement helpful in developing the early warning system for flowslide type of failure.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laboratory experiments on rainfall-induced flowslide from pore pressure and moisture content measurements

Hakro

Harahap

2015

Preprint

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“…In general, roadbeds or slopes consist of unsaturated soils with low initial moisture content, high matrix suction, and good stability. However, with the increase of wetting front depth, long-duration rainfall leads to matric suction decrease and results in the reduction of shear strengthfor unsaturated soils (Wei & Esaki 2012), in addition to it leads the poor durability, lack of stability, and uneven settlement of the roadbed. The variation of moisture content under rainfall infiltration has been established, and implemented in different models to estimate the softened shear strength of soils ( Jacobs et al 2004;Li et al 2005), resilient modulus of bound material (Khoury & Zaman 2004;Cary & Zapata 2011), and volumetric deformation of subgrade soil (Lytton et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Soil moisture migration model based on flux-concentration relation under steady rainfall

2021

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Moisture content distribution in soil is of great importance for understanding rainfall-induced slope failure and roadbed settlement. This study aims to develop a moisture migration model that improves the quantification of moisture content at an arbitrary point of the soil at any time for the whole process of infiltration under steady rainfall. The model was derived from the Richards' equation using the Flux-concentration relation, which was validated by numerical solutions calculated by Hydrus-1D software to evaluate the performance of the model. Results showed good accuracy and high adaptability for the moisture migration simulation of a wide range of soil types, and is applicable for short-duration and long-duration steady rainfall. Moreover, it can also reflect the stratification phenomenon for soil profile wetting by infiltration. Our analysis indicates that the flux and surface volumetric moisture content together can bound the boundary conditions of rainfall infiltration, which presents a shift from constant-flux to constant-concentration during a long-duration steady rainfall. The migration rate of the wetting front in the later stage of infiltration positively correlates with rainfall intensity under the constant-flux condition, while it finally stabilizes at Ks/(θs − θi) under the constant-concentration condition (i.e., Ks-saturated hydraulic conductivity, θs-saturated volumetric moisture content, θi-initial volumetric moisture content). HIGHLIGHT Moisture migration model was derived to improve the quantification of moisture content at an arbitrary point of the soil at any time for the whole process of infiltration under steady rainfall, which shows good accuracy and high adaptability for the moisture migration simulation of a wide range of soil types, and is applicable for short-duration and long-duration steady rainfall.

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“…As shown in Fig1. It is estimated that the landslide volume is about 2,700,000m 3 and it is very large. The main sliding direction of this landslide is almost EW.…”

Section: Introductionmentioning

confidence: 99%

Study on the Relationship between Deformation and Stability of Large Landslide with the Rainfall

Qin

2013

AMM

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Prediction problem of large catastrophic landslide is an important applied research topic of geotechnical mechanics. This paper made the detailed geology survey and analysis for the Xiapuzi landslide; based on the analysis of the rainfall data, analyzed landslide body stability under rainfall influence. Using deformation monitoring data,relationships were analyzed between rainfall infiltration time, critical rainfall and total rainfall,with the deformation of landslide, and the relationship between deformations incremental with the rainfall. Results provided a basis for choice of landslide treatment measures. The research accumulated experience for treatment of similar landslide geological disasters.

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Rapid assessment of regional superficial landslide under heavy rainfall

Cited by 7 publications

References 18 publications

Laboratory experiments on rainfall-induced flowslide from pore pressure and moisture content measurements

Laboratory experiments on rainfall-induced flowslide from pore pressure and moisture content measurements

Soil moisture migration model based on flux-concentration relation under steady rainfall

Study on the Relationship between Deformation and Stability of Large Landslide with the Rainfall

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