Numerical Analysis of Climate Effect on Slope Stability

Merat, Soumia; Djerbal, Lynda; Bahar, Ramdane

doi:10.1061/9780784481691.031

Cited by 4 publications

(6 citation statements)

References 5 publications

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“…In such cases, rainwater infiltration is most effective at reducing surface soil suction to a critical level. Moderate-intensity rainfall may fully penetrate the surface soil but might not adequately reduce soil suction [34]. Conversely, during particularly intense rainfall, some rainwater may run off.…”

Section: Introductionmentioning

confidence: 99%

Mechanics of Rainfall-Induced Landslides after a Prolonged Dry Period Based on Laboratory Tests and Numerical Models Incorporating Soil-Water Characteristic Curves

Bhadiyadra,

Ong

2024

Preprint

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In India, particularly within its North-Eastern territories, the occurrence of landslides triggered by post-dry period rainfall events is a significant concern, with the phenomena persistently causing extensive damage to both life and infrastructure. Despite the inevitability of such natural disasters, it is understood that the impact they exert can be substantially mitigated through the implementation of pre-emptive measures. Critical to the endeavour of landslide prevention is the application of a spectrum of mitigation strategies, predicated upon a foundational analysis of slope stability to ascertain critical surfaces for intervention. This investigation delves into the dynamics of partially saturated soils, a condition commonly resultant from the prolonged dry periods preceding the monsoonal rains. The study's focal point is an experimental examination conducted on soil samples to assess parameters such as soil matric suction and unconfined compressive strength across varying degrees of saturation and density, alongside performing analyses of slope failure incidents after dry period during the 2017 monsoon in the Lunglei district, Mizoram based on some established data. The Soil-Water Characteristic Curve (SWCC), derived from soil suction measurements employing the ASTM D5298-10 standard, utilizes a contact filter paper method and serves to delineate the moisture transition phases of the slope. To replicate the desiccation of the soil slope after monsoonal rains, a microwave drying technique based on the ASTM standard was employed to prepare unsaturated soil samples for Unconfined Compressive Strength (UCS) testing. The integrity of the slope was evaluated in a temporal context, before and after rainfall events of varied intensities throughout the calendar year, utilizing a blend of numerical modeling and empirical laboratory investigations. The persistence of real onsite slope failures underscores the necessity for a numerical analysis approach to unravel the underlying factors causing slope instability, especially given the absence of prior stability assessments for the landslide in question. An evaluation of SWCC curves, UCS tests on partially saturated soil at different densities and saturation and the utilization of the benchmark data collected in 2017 on the shallow transitional landslide in Lunglei, Mizoram caused by intense monsoonal precipitation, are central key data and information used to carry out this research. Rainfall data for Lunglei, sourced from the Mizoram Meteorological Department, facilitated a real-time monsoonal data-driven numerical analysis. This analysis elucidated the pivotal role of rainfall in inducing slope failure, indicating a marked destabilization of the slope after precipitation events. The implications of these findings are far-reaching, suggesting a foundational basis for the development of an advanced landslide early warning system, thereby enhancing disaster preparedness, and mitigating potential damages.

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Section: Introductionmentioning

confidence: 99%

Mechanics of Rainfall-Induced Landslides after a Prolonged Dry Period Based on Laboratory Tests and Numerical Models Incorporating Soil-Water Characteristic Curves

Bhadiyadra,

Ong

2024

Preprint

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“…Uniform drying techniques, like microwave drying, are essential for accurate research [12]. Rainfall intensity and soil properties impact slope stability, highlighting the importance of predictive modeling [19,20]. Setting rainfall thresholds and using Figure 2 shows the water retention curve, illustrating the relationship between soil saturation and negative pore water pressure from studies on unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

“…Uniform drying techniques, like microwave drying, are essential for accurate research [12]. Rainfall intensity and soil properties impact slope stability, highlighting the importance of predictive modeling [19,20]. Setting rainfall thresholds and using Landslides, driven by gravity, rapidly move soil and rock downhill, often triggered by rainfall, especially during monsoons in North-East India [7,11,14].…”

Section: Introductionmentioning

confidence: 99%

“…Uniform drying techniques, like microwave drying, are essential for accurate research [12]. Rainfall intensity and soil properties impact slope stability, highlighting the importance of predictive modeling [19,20]. Setting rainfall thresholds and using stabilization measures are vital for slope integrity [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…Setting rainfall thresholds and using stabilization measures are vital for slope integrity [21,22]. Continuous monitor-ing and real-time assessments are crucial for managing construction and environmental risks [19,23].…”

Section: Introductionmentioning

confidence: 99%

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Mechanics of Rainfall-Induced Landslides after a Prolonged Dry Period Based on Laboratory Tests and Numerical Models Incorporating Soil-Water Characteristic Curves

Bhadiyadra,

Ong

2024

Geosciences

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In India, particularly within its Northeastern territories, landslides triggered by rainfall following dry periods are a major concern, consistently causing extensive damage to both life and infrastructure. This study focuses on mitigating their impact through preemptive measures, with an emphasis on analyzing slope stability to determine critical intervention points. The investigation includes experimental tests on soil samples to assess key parameters, such as soil matric suction and unconfined compressive strength, alongside an analysis of slope failures during the 2017 monsoon in Mizoram’s Lunglei district. Employing Soil-Water Characteristic Curves (SWCC) derived from ASTM D5298-10 standards and a microwave drying technique for preparing soil samples, the research evaluates the condition of the slopes before and after monsoonal rains. This study utilizes a blend of numerical modeling and empirical laboratory investigations to explore the factors contributing to slope instability. The findings underscore the necessity of advanced landslide warning systems, suggesting that a deeper understanding of rainfall-induced slope failures could significantly enhance disaster preparedness and reduce potential damages.

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