Rainfall Induced Shallow Slope Failure over Yazoo Clay in Mississippi

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

doi:10.1061/9780784481691.016

Cited by 5 publications

(6 citation statements)

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“…Increasing the number of wet-dry cycles can lead to the expansion of a substantial number of secondary cracks and damage to the slope [102,103]. Rainwater infiltration similarly affects the slope safety factor and contributes to slope failure [10,[104][105][106][107]. Landslide damage can also occur on low-gradient expansive soil slopes due to wet-dry cycles, indicating that the soil s strength can dramatically affect slope stability [100,108].…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Repeated failures of expansive soil slopes in states such as Mississippi and Texas in the United States have seriously affected highway operations [8]. These engineering accidents have forced many scholars to research expansive soil slopes [8][9][10]. From the perspective of engineering safety and economy, it is vital to analyze the failure mechanism of expansive soil slopes comprehensively and systematically to improve the protection methods of such slopes.…”

Section: Introductionmentioning

confidence: 99%

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Failure Mechanisms and Protection Measures for Expansive Soil Slopes: A Review

Luo,

2024

Sustainability

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Due to the significant hydrophilicity and cracking properties of expansive soils, expansive soil slopes are prone to destabilization and landslides after rainfall, seriously threatening the safety of buildings, highways, and railroads. Substantial economic losses often accompany the occurrence of expansive soil slope disasters; thus, it is of great significance to understand the slope failure mechanisms experienced by expansive soil slopes and to prevent expansive soil slope disasters. In this paper, the current research status of the landslide failure mechanism of expansive soil slopes is systematically reviewed based on three research methods: field test, model test, and numerical simulation. The failure mechanisms of expansive soil slopes and the main influencing factors are summarized. Based on the failure mechanisms, three protection principles (waterproofing and water blocking, swelling–shrinkage deformation limitation, and crack inhibition and strength enhancement) that can be followed for disaster prevention of expansive soil slopes are proposed. The research status and advantages and disadvantages of these protection methods are reviewed, and future researchable directions of the stability of expansive soil slopes and slope protection methods are explored. Based on the previous work, a new flexible ecological slope protection system with a double waterproof layer is proposed for expansive soil slopes to realize ecological, efficient, and long-term protection. This paper thus aims to provide technical reference for the prevention and control of slope engineering disasters in expansive soil areas.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Failure Mechanisms and Protection Measures for Expansive Soil Slopes: A Review

Luo,

2024

Sustainability

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“…At the same time, rainwater infiltration is the main cause of slope landslides in expansive soil embankments. Khan et al studied the influence of rainfall on the safety factor of filling slopes in Yazoo, where shallow landslides occur year round, and verified that regardless of the rainfall intensity and duration, the total rainfall amount directly affects the slope safety factor, resulting in slope instability [24]. You et al found that the stability of expansive soil embankment slopes is mainly affected by humidity.…”

Section: Moisture Retention and Seepage Prevention Technologymentioning

confidence: 99%

Expansive Soil Embankment Filling and Cutting Treatment Technology: A Systematic Review

Huang

Shi

Zhang

et al. 2022

Advances in Materials Science and Engineering

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The characteristics of expansive soil, including over consolidation, swelling-shrinkage, fissures, and strength attenuation, can cause potential hazards in road construction, which are mainly manifested as subgrade swelling-shrinkage deformation and slope collapse. Effective treatment can not only ensure long-term subgrade stability but also reduce investment costs and environmental impact. In this review, the current development status of embankment filling and cutting slope treatment technology in expansive soil areas were summarized, and the classification standards of expansive soil filler, moisture retention, and antiseepage technology were described. Then, the utility of chemical, physical, biological, and solid waste modification materials in improving the engineering characteristics of core-filled expansive soil was discussed, and the cost and technical characteristics of these modification technologies were compared and analysed. Next, the application of rigid and flexible support technology in the treatment of cutting slope collapse was analysed, and the advantages and disadvantages of rigid and flexible supports were summarized. Finally, the development direction of expansive soil subgrade treatment technology was discussed. This review includes a summary of the treatment methods of highway subgrade in expansive soil areas and can provide a technical reference for treatment methods of expansive soil subgrade.

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“…Consequently, the Mississippi Department of Transportation (MDOT) cannot adopt the conventional design approach of broadening the highway slopes to ratios ranging from 5H:1V to 6H:1V. That is why highway slopes constructed on Yazoo clay are at risk of failure triggered by rainfall [10][11][12][13]. A moderate to steep slope built on high-plasticity clay is prone to experiencing softening phenomena within the active zone of the slope (approximately the upper 12 to 15 feet) during seasonal wet-dry cycles.…”

Section: Introductionmentioning

confidence: 99%

“…That is why rainfall-induced slope failure is very common in southern states of the USA, where expansive clay soil is prevalent. The rainwater infiltrates into the slope soil and reduces the matric suction of the slope [21]. The decrease in the matric suction reduces the soil shear strength and leads to a shallow slope failure [22].…”

Section: Introductionmentioning

confidence: 99%

Impact of Vetiver Plantation on Unsaturated Soil Behavior and Stability of Highway Slope

Rahman,

Chakraborty,

Khan

et al. 2024

Geosciences

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Due to cyclic wetting and drying, the hydro-mechanical behavior of unsaturated soil is impacted significantly. In order to assess the soil strength parameters, knowing the unsaturated behavior is important. Soil moisture content is an important parameter that can define the shear strength of the soil. Most of the highway slopes of Mississippi are built on highly expansive clay. During summer, the evaporation of moisture in the soil leads to shrinkage and the formation of desiccation cracks, while during rainfall, the soil swells due to the infiltration of water. In addition to this, the rainwater gets trapped in these cracks and creates perched conditions, leading to the increased moisture content and reduced shear strength of slope soil. The increased precipitation due to climate change is causing failure conditions on many highway slopes of Mississippi. Vetiver, a perennial grass, can be a transformative solution to reduce the highway slope failure challenges of highly plastic clay. The grass has deep and fibrous roots, which provide additional shear strength to the soil. The root can uptake a significant amount of water from the soil, keeping the moisture balance of the slope. The objective of the current study is to assess the changes in moisture contents of a highway slope in Mississippi after the Vetiver plantation. Monitoring equipment, such as rain gauges and moisture sensors, were installed to monitor the rainfall of the area and the moisture content of the soil. The data showed that the moisture content conditions were improved with the aging of the grass. The light detection and ranging (LiDAR) analysis was performed to validate the field data obtained from different sensors, and it was found that there was no significant slope movement after the Vetiver plantation. The study proves the performance of the Vetiver grass in improving the unsaturated soil behavior and stability of highway slopes built on highly expansive clay.

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Rainfall Induced Shallow Slope Failure over Yazoo Clay in Mississippi

Cited by 5 publications

References 0 publications

Failure Mechanisms and Protection Measures for Expansive Soil Slopes: A Review

Failure Mechanisms and Protection Measures for Expansive Soil Slopes: A Review

Expansive Soil Embankment Filling and Cutting Treatment Technology: A Systematic Review

Impact of Vetiver Plantation on Unsaturated Soil Behavior and Stability of Highway Slope

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