Contribution of “Soils and Foundations” to Studies on Rainfall-Induced Slope Failure

Kitamura, Ryosuke; Sako, Kazunari

doi:10.3208/sandf.50.955

Cited by 29 publications

(7 citation statements)

References 91 publications

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“…The rainfall-induced slope failures may occur on natural slopes in a variety of materials including residual and colluvial soils (Fourie, 1996;Crosta and Frattini, 2003;Dai et al, 2003). It is generally recognized that rainfall-induced landslides are caused by changes in porewater pressures and seepage forces (Zhu and Anderson, 1998;Gerscovich et al, 2006;Kitamura and Sako, 2010;Fredlund et al, 2012;Lu and Godt, 2013). The slope failures are normally shallow with a depth of failure less than 3 m, above the groundwater table, and generally of small volume on steep soil slopes of 30°-50° (Johnson and Sitar, 1990;Dai et al, 2003).…”

Section: Slope Failures Under Rainfall and Failure Mechanismsmentioning

confidence: 99%

Introduction

2016

Rainfall-Induced Soil Slope Failure

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Section: Slope Failures Under Rainfall and Failure Mechanismsmentioning

confidence: 99%

Introduction

2016

Rainfall-Induced Soil Slope Failure

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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%

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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“…Besides, since thawing soil, which exhibits high fluidity and high water content, exists over the slippery frozen soil layer, the slope failure regarding the boundary of two-layer structure as a potential slip surface would occur easily in thawing season as compared with usual. In general, the factors which seriously affect stability of soil slope in warm-temperate regions are mainly the generation of pore water pressure, the decrease in shear strength of soil, and the increase in unit weight of soil (Kitamura and Sako 2010). In addition to these three influencing factors, the mechanism of slope failure in snowy cold regions is dominated by snowmelt, freeze-thaw actions, and frost susceptibility of soil.…”

Section: Comparison To Influencing Factors In Warmtemperate Regionsmentioning

confidence: 99%

Geohazard at volcanic soil slope in cold regions and its influencing factors

Ishikawa

Tokoro

Miura

2015

JGS Special Publication

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This study examines the mechanism of the geohazards occurred at a volcanic soil slope in cold regions and its influencing factors in consideration of the effects of freeze-thaw actions on the physical properties, the water retention-permeability characteristics, and the deformation-strength characteristics of volcanic soils from the viewpoint of both experimental study and analytical study. To this end, we performed the long-term field measurement, model tests, laboratory element tests, and numerical simulations by taking volcanic soil slope subjected to freeze-thaw actions. As the results, this study revealed that there is a difference in the slope failure mechanism between cold region and warm-temperate region, and that freeze-thaw actions seriously influence thermo-hydro-mechanical behaviour of crushable volcanic coarse-grained soil slope under unsaturated condition even if the soil is a non-frost-susceptible geomaterial. Furthermore, this study clarified the mechanism, the endogenous factors, and the exogenous factors of the slope failure for volcanic soil ground in Hokkaido in comparison with the slope failure in warm-temperate regions.

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Contribution of “Soils and Foundations” to Studies on Rainfall-Induced Slope Failure

Cited by 29 publications

References 91 publications

Introduction

Introduction

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

Geohazard at volcanic soil slope in cold regions and its influencing factors

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