Effect of Rainfall on Stability of Unsaturated Earth Slopes Constructed on Expansive Clay

Hossain, J.; Hossain, Md. Sahadat; Hoyos, Laureano R.

doi:10.1061/9780784412787.042

Cited by 14 publications

(10 citation statements)

References 8 publications

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“…It is reported that slopes made of fine-grained soil experienced failures due to prolonged rainfall [2]. Over time, the Fully Softened Shear Strength (FSSS) merging with Perched Water Condition (PWC) induced rainfall is reported to be the principal cause of shallow slope failures [1,4]. Generally, the failure depth in embankments constructed of HPYCS is usually within 0.91-1.82 m and the slip surface along with the failure envelope remains parallel [1].…”

Section: Introductionmentioning

confidence: 99%

“…In most cases, with the presence of vegetation cover, evapotranspiration causes the topsoil part to lose its water content during the dry periods between rainfall events. Consequently, high intensity and short duration rainfall following a long duration rainfall can cause the soil to be fully saturated and trigger the slope to be slipped [4,11]. It should be noted that the aforementioned condition may not be the case for high plastic clay soils.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Slope Stabilization Using Recycled Plastic Pins in Yazoo Clay

2021

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Geographically, at the center of Mississippi is a concentration of High Plastic Yazoo Clay Soil (HPYCS). Shallow landslides frequently occur in embankments constructed with HPYCS caused by rainfall-induced saturation of the embankment slope. The traditional methods are becoming expensive to repair the shallow slope failure. The use of Recycled Plastic Pins (RPPs) to stabilize shallow slope failures offers a significant cost and construction benefit and can be a useful remedial measure for these types of failures. The current study investigates the effectiveness of RPP in slopes constructed with HPYCS, using the Finite Element Method (FEM). The FEM analysis was conducted with the PLAXIS 2D software package. Three uniform and varied RPP spacings were investigated to reinforce 2–4H:1V slopes. Reinforced slope stability analyses were performed to investigate the applicability of RPP in HPYCS. The FEM analysis results indicated that RPP provides shear resistance for the sloping embankment constructed of HPYCS. Uniform spacing of RPP provides sufficient resistance that increases the Factor of Safety (FS) to 1.68 in 2H:1V slopes with deformation of RPP less than 15 mm. The uniform spacing and varied spacing combination of RPP increase the FS to 2.0 with the deformation of RPP less 7 mm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Slope Stabilization Using Recycled Plastic Pins in Yazoo Clay

2021

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“…Along steep slopes, the shallow covers usually rest in unsaturated conditions and the failure mechanism, under rainwater infiltration, primarily involves the wetting front advancement, which causes suction loss, in turn leading to a decrease in soil shear strength. Thus, slope stability which is directly linked to the pore water pressure distribution within the slope, is a function of infiltration rate, soil hydraulic and mechanical characteristics, and slope geometry (Alonso et al 1995;Collins and Znidarcic 2004;Eichenberger et al 2011;Hossain et al 2013). In some cases, also the post-failure evolution of the soil mass, which may experience a complete fluidization turning into a very rapid and destructive flowslide D r a f t (Hutchinson 1988;Hungr 2001), is related to the degree of saturation of the soil at the onset of the instability (Damiano and Olivares 2010).…”

Section: Introductionmentioning

confidence: 99%

Effects of layering on triggering mechanisms of rainfall-induced landslides in unsaturated pyroclastic granular soils

Damiano

2019

Can. Geotech. J.

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Rainfall-induced landslides are widespread in shallow layered granular soil deposits. In many cases, slope instability is related to the decrease of suction during rainwater infiltration. However, the contrasts in the unsaturated hydraulic properties of the soils deeply affect the infiltration process, thus influencing slope failure. Coarse-textured soil layers embedded between finer ones may initially confine the process within the overlying finer layers, delaying the infiltration and eventually inducing lateral flow diversion. Nonetheless, depending on the state variables at the beginning of rainfall as well as on rainfall characteristics, the coarser layers may or may not have a positive effect on stability. The results of research based on advanced geotechnical characterization, physical and numerical modeling, and field monitoring have been analyzed to investigate the effects of layering on slope stability.

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“…During the dry period, because of the existence of the desiccation cracks, the rainwater can easily infiltrate the clay soil and may progressively saturate the topsoil. Additionally, the successive rainfall event can have a significant influence to induce the shallow slope failure as it permeates through the desiccation cracks, and generate a softened zone in the slope’s soil ( 14 , 15 ). Rainfall-induced slope failures in fine-grained soil are reported to occur either during or immediately following periods of intense or prolonged heavy rainfall ( 16 , 17 ).…”

mentioning

confidence: 99%

Numerical Investigation of Hydraulic Conductivity Variation on Highway Slopes Made of Expansive Yazoo Clay

Khan

Nobahar

Ivoke

et al. 2022

Transportation Research Record: Journal of the Transportation R

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Expansive soils cover more than 25% of the total area of the United States and are subjected to shrink-swell behavior with moisture variation. With successive moisture and temperature variations over the seasons, the hydraulic conductivity of the expansive soil is subjected to change because of the development of shrinkage cracks which affect the vertical hydraulic conductivity, whereas the horizontal hydraulic conductivity remains negligibly constant. This affects the percolation behavior of the subgrade soil and, in turn, reduces the soil strength, as one of the major factors of slope failure. However, no study has been done on the change in the hydraulic properties of expansive soil with time and its effect on highway slopes. The current study intends to investigate the hydraulic conductivity and matric suction variation at different wet-dry cycles on highway slopes. An instantaneous profile method to investigate the changes in hydraulic conductivity during 1N to 5N wet-dry cycles was utilized. The finite element method in Plaxis was conducted to evaluate the effect of different frequencies and duration of rainfall on water intrusion, and the corresponding change in the matric suction of the highway slope. The selected rainfall pattern is evaluated at different intensities and durations of rainfall based on 100-years return periods. The flow analysis showed that the suction dropped at the highway slope with the presence of rainfall.

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Effect of Rainfall on Stability of Unsaturated Earth Slopes Constructed on Expansive Clay

Cited by 14 publications

References 8 publications

Numerical Investigation of Slope Stabilization Using Recycled Plastic Pins in Yazoo Clay

Numerical Investigation of Slope Stabilization Using Recycled Plastic Pins in Yazoo Clay

Effects of layering on triggering mechanisms of rainfall-induced landslides in unsaturated pyroclastic granular soils

Numerical Investigation of Hydraulic Conductivity Variation on Highway Slopes Made of Expansive Yazoo Clay

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