Influence of hydraulic properties on physically modelling slope stability and the definition of rainfall thresholds for shallow landslides

Marin, Roberto; Velásquez, María Fernanda

doi:10.1016/j.geomorph.2019.106976

Cited by 52 publications

(37 citation statements)

References 63 publications

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“…Then, the pore pressure should be expressed as the sum of two components, the pressure head produced by long-term infiltration into a steady state with a lateral flow domain, and the response of pressure head in the short term in a transient state dominated by vertical flow [60], [96]. This situation in the field occurs when moisture in soils is high by the presence of antecedent rainfalls, so lower amounts of soil water are required to detonate landslides; on the contrary, when the soil water content is low for a dry period, larger volume of rainfall is required to infiltrate the soil [97]. This same behaviour has already been reported by other authors for partially saturated soils who found that the distribution of suction in high permeability soils is more influenced by short, heavy rainfalls, while suction in low permeability soils is governed by rainfall duration [98].…”

Section: Discussionmentioning

confidence: 99%

Rainfall-intensity effect on landslide hazard assessment due to climate change in north-western Colombian Andes

Giraldo

Aristizábal

Sánchez

et al. 2020

Rev.Fac.Ing.Univ.Antioquia

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Landslides triggered by rainfall are one of the most frequent causes of disasters in tropical countries and mountainous terrains. Recent studies show an upsurge in landslide occurrence as an expected impact of human-induced climate change. This paper presents the analysis and implementation of two different physically-based models, SHALSTAB and TRIGRS, to evaluate the effect of rainfall on landslide hazard assessment in the north-western Colombian Andes. Intensity-Duration-Frequency curves were used in climate change scenarios for different return periods. According to the results, although higher rainfall intensities increase, landslide occurrence does not escalate in a direct or proportional relationship. Considering a steady infiltration process (SHALSTAB), the results show an expansion of d unstable areas, compared with a transient infiltration process (TRIGRS). A greater influence of rainfall duration instead of rainfall intensity was observed. The results highlight the need for studies that incorporate the scenarios of variability and climate change in the hazard assessment and land planning in the long term.

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Section: Discussionmentioning

confidence: 99%

Rainfall-intensity effect on landslide hazard assessment due to climate change in north-western Colombian Andes

Giraldo

Aristizábal

Sánchez

et al. 2020

Rev.Fac.Ing.Univ.Antioquia

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“…The long-term deformation pattern of an ancient landslide with a planar sliding surface in the TGRA was found to be deeply connected with periodic fluctuations in the reservoir water level [10]. The failure of these landslides is strictly influenced by the increase in pore water pressure and the consequent reduction in mean effective stress and is considered a complex slope instability phenomenon since the landslides exhibit distinct kinematic characteristics during the failure, post-failure, and propagation stages [11][12][13][14]. Lots of research achievements on deformation characteristics and failure pattern respect to rainfall and reservoir water level have been obtained, for example, the evolution characteristics of the Huangtupo landslide based on in-situ tunneling and monitoring data were fully introduced, that rapid changes of reservoir water level has a huge influence on the landslide stability [15,16].…”

Section: Introductionmentioning

confidence: 99%

Study on the Deformation Mechanism of Reservoir Landslides Considering Rheological Properties of the Slip Zone Soil: A Case Study in the Three Gorges Reservoir Region

2020

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Reservoir water level fluctuation is one of the main extrinsic factors that could change the stress field in landslides, as well as the mechanical strength of geomaterials, hence affecting the deformation and stability of landslides. The largest reservoir landslide in the Three Gorges Reservoir area was selected for a case study. The impact of reservoir water level fluctuation is represented by the dynamic change in the underground seepage field and was thereby analyzed with numerical modeling. The deformation behavior considering the rheological properties of the slip zone soil was studied. The sudden change in the displacement–time curve was selected as the failure criterion for the investigated landslide. The evolution process of the accelerated deformation stage was divided into slow acceleration, fast acceleration, and rapid acceleration stages. The Huangtupo landslide is characterized by a retrogressive landslide and is currently in the creep deformation stage; the deformation mechanism and deformation characteristics are closely related to the reservoir water level fluctuation. Research was carried out by means of field investigation, in situ monitoring, and numerical simulation to provide a true and reliable result for stability evaluation.

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“…La metodología que se implementó para analizar y evaluar el riesgo de deslizamientos superficiales representa una herramienta que puede ser útil en planes de ordenamiento territorial y gestión del riesgo de movimientos en masa. Su simplicidad y fácil aplicación, comparado con otros modelos físicos [42], [43] o metodologías para análisis del riesgo [8], [9], [16] que han sido implementadas en esta región, constituye una buena alternativa para muchos proyectos de infraestructura.…”

Section: Conclusionesunclassified

Análisis y evaluación del riesgo de deslizamientos superficiales en un terreno montañoso tropical: implementación de modelos físicos simples

2020

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El riesgo de deslizamientos superficiales expresa las pérdidas o daños causados por la ocurrencia de este fenómeno y depende de la magnitud, relacionada con su probabilidad de ocurrencia, y su efecto en los elementos expuestos, determinado por su grado de vulnerabilidad. En esta investigación se analizan y evalúan la amenaza, vulnerabilidad y riesgo de deslizamientos superficiales en un terreno montañoso tropical. Se utilizó el modelo físico SHALSTAB para el análisis de la amenaza y otros modelos de fácil implementación para calcular la vulnerabilidad física de ocho viviendas y de personas dentro de las mismas. Se calcula el riesgo de las estructuras, en términos económicos, y el riesgo de pérdidas de vidas humanas, para personas dentro de las viviendas, mediante un análisis de las consecuencias de estos elementos expuestos dada la ocurrencia de deslizamientos superficiales definidos en la evaluación de la amenaza. Esta metodología representa una herramienta que puede ser útil en planes de ordenamiento territorial y gestión del riesgo de movimientos en masa.

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Influence of hydraulic properties on physically modelling slope stability and the definition of rainfall thresholds for shallow landslides

Cited by 52 publications

References 63 publications

Rainfall-intensity effect on landslide hazard assessment due to climate change in north-western Colombian Andes

Rainfall-intensity effect on landslide hazard assessment due to climate change in north-western Colombian Andes

Study on the Deformation Mechanism of Reservoir Landslides Considering Rheological Properties of the Slip Zone Soil: A Case Study in the Three Gorges Reservoir Region

Análisis y evaluación del riesgo de deslizamientos superficiales en un terreno montañoso tropical: implementación de modelos físicos simples

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