Evaluation of rainfall induced moisture variation depth in highway embankment made of Yazoo clay

Khan, Mohammad Sadik; Nobahar, Masoud; Stroud, Mike; Amini, Farshad; Ivoke, John

doi:10.1016/j.trgeo.2021.100602

Cited by 12 publications

(6 citation statements)

References 22 publications

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“…For other soil layers, the vertical and horizontal hydraulic conductivity values were considered the same in all directions. Using this technique, the moisture and matric suction values obtained from numerical analysis were found to be in excellent agreement with Hossain et al and the field instrumentation ( 15 , 20 ).…”

Section: Finite Element Methods (Fem) Approachsupporting

confidence: 78%

“…Nobahar et al and Hossain et al used a high vertical hydraulic conductivity value for the surficial soil layer at the slopes to simulate the impact of desiccation crack hydro-mechanical analysis ( 9 , 15 ). As utilized by Khan et al, the high vertical hydraulic conductivity value was adopted during this study for weathered Yazoo clay ( 20 ). For other soil layers, the vertical and horizontal hydraulic conductivity values were considered the same in all directions.…”

Section: Finite Element Methods (Fem) Approachmentioning

confidence: 99%

“…The optimum moisture of 32% and maximum dry unit weight of 18 kN/m 3 (114.5 pounds per cubic foot [pcf]) were achieved according to test methods of ASTM D698 ( 19 , 20 ). Hydraulic conductivity ( k ) is a function of void ratio ©.…”

Section: Site Location and Soil Physical Propertiesmentioning

confidence: 99%

“…As a result, samples that have been fully saturated and then completely dried tend to have a higher swell potential at lower applied stress because of the increased number of wetting and drying cycles. Expansive soils subjected to partial drying, on the other hand, tend to have lower swell potential at lower applied stress with an increase in wetting and drying cycles ( 20–22 ). Figure 2 shows that the wetting curves reach full saturation at the end of the wetting and drying paths.…”

Section: Site Location and Soil Physical Propertiesmentioning

confidence: 99%

“…The regional extent of the Yazoo clay lies within the central Mississippi counties of Yazoo, Holmes, Hinds, Rankin, Madison, Scott, Newton, Smith, Jasper, and Wayne. The horizontal width of the surface outcrop varies from approximately 35 mi on the west to less than 10 mi on the east, whereas the metropolitan Jackson area is located directly on top of the Yazoo clay ( 20 ). Yazoo clay is indicated to have a very high shrink/swell potential and moisture changes result in expansive, swelling, shrinkage, and otherwise destructive behavior, causing detrimental effect on the roads, foundations, and related infrastructure in the central Mississippi region ( 7–9 ).…”

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confidence: 99%

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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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Section: Finite Element Methods (Fem) Approachsupporting

confidence: 78%

Section: Finite Element Methods (Fem) Approachmentioning

confidence: 99%

Section: Site Location and Soil Physical Propertiesmentioning

confidence: 99%

Section: Site Location and Soil Physical Propertiesmentioning

confidence: 99%

mentioning

confidence: 99%

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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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Using high-resolution UAV imagery and artificial intelligence to detect and map landslide cracks automatically

Sandric,

Chitu,

Ilinca

et al. 2024

Landslides

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Mapping landslide cracks is essential in understanding landslide dynamics and evolution across space and time. Each landslide crack’s depth, direction, and width are related to the stress and strain imposed on the landslide body. Moreover, their spatial distribution can indicate areas where the landslide can extend, mainly if located in the upper part of the main landslide scarp. Even though the cracks leave a distinct pattern on the landslide body when fresh or when there is a high contrast between the bare soil and surrounding vegetation, these patterns gradually diminish over time, making their detection difficult. The problem of landslide cracks mapping in various environmental conditions and having different ages was tackled in the current study using very high spatial resolution unmanned aerial vehicle (UAV) aerial imagery and derived products in conjunction with deep learning models. U-Net and DeepLab CNN models were applied using masked and non-masked training samples with different tile sizes. As the tile size decreases, the performance metrics, such as precision, recall, and F1-score, generally decrease. Overall, the lowest accuracy was approximately 0.79 for non-mask samples and tile size of 64 pixels, and reached over 0.93 for masked samples and tile size of 512 pixels.

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Serviceability of cut slope and embankment under seasonal climate variations

2022

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Evaluation of rainfall induced moisture variation depth in highway embankment made of Yazoo clay

Cited by 12 publications

References 22 publications

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

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

Using high-resolution UAV imagery and artificial intelligence to detect and map landslide cracks automatically

Serviceability of cut slope and embankment under seasonal climate variations

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