Prediction of Shallow Rainfall-Induced Landslides Using Shear Strength of Unsaturated Soil

Ravindran, Sinnappoo; Gratchev, Ivan

doi:10.1007/s40098-020-00468-6

Cited by 8 publications

(9 citation statements)

References 41 publications

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“…If the daily rainfall in Chittagong is expected to be greater than 150-250 mm, early warnings will be sent to populations that are close to hill slopes and are at risk. The amount of precipitation for which a warning is issued will depend on local factors like slope, vegetation, and geology [15,16,21,22]. In Chittagong, the criteria for rainfall-related landslide warnings are often derived from statistical studies (from 2000 to 2022, figure-4) and practical knowledge.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Stability analysis of rainfall-induced landslides: A case study of a hilly area in Bangladesh

Hossain

Hasan

Hasanath

et al. 2023

Preprint

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This investigation examines the landslide due to rain in the Chattogram Hill Tracts of Bangladesh, including its origins, impacts, and the role played by the local geology and environment. Thus, designing early warning systems for such threats requires an in-depth understanding of the geo-environmental properties of soil slopes under heavy rainfall. In the past, when it rained more than 150–250 mm, localized slope collapses and large-scale debris floods occurred. Both extensive landslides and small-scale slope collapses have been seen. As a result, studies of soil-water characteristics have been conducted, followed by laboratory testing at the impacted sites. While hill cutting, deforestation, and unplanned human settlements contribute to landslide disasters, the study found that rainfall and soil type (fine-grained silt) were the most critical factors behind landslides. The slope stability equation was combined with a numerical model to pinpoint the issue's root. When it rains heavily, the soil becomes more saturated than usual, and its suction and shear strengths fall, as shown by analytical investigations and computer models. The slopes of the hills become precarious as a consequence. However, the mechanism has been demonstrated, considering some simplified assumptions. In contrast, it has been noticed that most of the landslides occurred when the degree of saturation was maximum and the safety factor was nearly 0.4 to 0.9; on the other hand, the safety factor was 1.8 to 2.0 in the dry condition. These experimental findings might be implemented in early warning systems for flash floods and landslides.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Stability analysis of rainfall-induced landslides: A case study of a hilly area in Bangladesh

Hossain

Hasan

Hasanath

et al. 2023

Preprint

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“…Several triaxial tests on saturated soil specimens were conducted to estimate the undrained strength of soil under loads (Ravindran and Gratchev 2021). In addition, a series of shear box tests on soil specimens at different values of water content were carried out to investigate the effect of moisture on soil strength.…”

Section: Characteristics Of Soils From Landslide Sitesmentioning

confidence: 99%

Mechanisms of Shallow Rainfall-Induced Landslides from Australia: Insights into Field and Laboratory Investigations

Gratchev

Ravindran

Kim³

et al. 2023

Progress in Landslide Research and Technology, Volume 1 Issue 1, 2022

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This paper presents and discusses the mechanisms of rainfall-induced shallow landslides that commonly occur in South East Queensland (SEQ) and northern New South Wales (NSW), Australia. The major factors causing the formation of landslide mass such as geology, weathering, and rainfall patterns were discussed. Results from field surveys and laboratory testing of rock/soil material from landslide masses were presented, and relationships between the material strength and landslide occurrence were drawn. It was found that most of shallow slides were related to sandstone deposits. Those failures occurred on natural slopes and road cuts with the inclination of the failure plane being in the range of 35–45°. For natural slopes where the landslide mass mostly consisted of coarse-grained soil, the relationship between the soil strength and water content was established. In addition, the relationship between rainfall patterns such as intensity and duration, and the landslide occurrence was presented. Based on the data from field work and laboratory results including a series of flume tests, the mechanism of shallow landslides triggered by rainfall events was identified and discussed.

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“…If the daily rainfall in Chittagong is expected to be greater than 150-250 mm, early warnings will be sent to populations that are close to hill slopes and are at risk. The amount of precipitation for which a warning is issued will depend on local factors like slope, vegetation, and geology [15,16,21,22] . In Chittagong, the criteria for rainfall-related landslide warnings are often derived from statistical studies (from 2000 to 2022, figure 3) and practical knowledge.…”

Section: Antecedent Rainfallmentioning

confidence: 99%

Stability analysis of rainfall-induced landslides: A case study of a hilly area in Bangladesh

Hore(PhD)

2023

EAR

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Rainfall-induced landslides stand as the prevailing geohazard in tropical and subtropical regions. The ongoing global climatic changes have introduced a wave of anomalous rainfall events across the world. These abnormal weather patterns have triggered numerous landslide incidents, resulting in significant loss of life and property. To develop early warning systems for such threats to people in mountainous areas of Chittagong, Bangladesh, it requires an in-depth understanding of the geo-environmental properties of soil slopes under heavy rainfall. Historical records reveal that rainfall in total exceeding 150–250 mm has resulted in both localized slope collapses and debris floods. When it rains heavily, rainwater infiltrates initially unsaturated slopes, elevating the degree of saturation while decreasing soil suction. Consequently, the reduced shear strength along the critical slip surface diminishes the factor of safety (FoS), and slope failure occurs. As a result, studies of soil-water characteristics have been conducted, followed by laboratory testing at the impacted sites, and the study found that rainfall and soil type (fine-grained silt) were the most critical factors behind landslides. The mechanism of slope failure is also demonstrated using a simple numerical infiltration model and a slope stability equation. The soil characteristics, the saturated volumetric water content (θs), closely match the field water holding capacity (θf), with a minor difference of 4-8%, and the drainage condition at the bottom of the slope appear to be important factors. Application of these test results to an early warning system for landslides and flash floods is finally demonstrated based on some simplifying assumptions.

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Prediction of Shallow Rainfall-Induced Landslides Using Shear Strength of Unsaturated Soil

Cited by 8 publications

References 41 publications

WITHDRAWN: Stability analysis of rainfall-induced landslides: A case study of a hilly area in Bangladesh

WITHDRAWN: Stability analysis of rainfall-induced landslides: A case study of a hilly area in Bangladesh

Mechanisms of Shallow Rainfall-Induced Landslides from Australia: Insights into Field and Laboratory Investigations

Stability analysis of rainfall-induced landslides: A case study of a hilly area in Bangladesh

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