Slope movements — Geotechnical characterization, risk assessment and mitigation

Leroueil, Serge; Locat, Jacques

doi:10.1201/9781003078173-6

Cited by 12 publications

(10 citation statements)

References 7 publications

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“…For a prone to fall rock fragment to pass through a point within a given period of time (event C), it must be released from the source area (event A) and propagate (or travel) from the source to the point considered (event B). Thus, the probability of event C is the probability of event A multiplied by the probability of event B, given that event A has occurred [27][28][29]:…”

Section: Localized Hazardmentioning

confidence: 99%

Definitions and Concepts for Quantitative Rockfall Hazard and Risk Analysis

et al. 2021

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There is an increasing need for quantitative rockfall hazard and risk assessment that requires a precise definition of the terms and concepts used for this particular type of landslide. This paper suggests using terms that appear to be the most logic and explicit as possible and describes methods to derive some of the main hazards and risk descriptors. The terms and concepts presented concern the rockfall process (failure, propagation, fragmentation, modelling) and the hazard and risk descriptors, distinguishing the cases of localized and diffuse hazards. For a localized hazard, the failure probability of the considered rock compartment in a given period of time has to be assessed, and the probability for a given element at risk to be impacted with a given energy must be derived combining the failure probability, the reach probability, and the exposure of the element. For a diffuse hazard that is characterized by a failure frequency, the number of rockfalls reaching the element at risk per unit of time and with a given energy (passage frequency) can be derived. This frequency is relevant for risk assessment when the element at risk can be damaged several times. If it is not replaced, the probability that it is impacted by at least one rockfall is more relevant.

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Section: Localized Hazardmentioning

confidence: 99%

Definitions and Concepts for Quantitative Rockfall Hazard and Risk Analysis

et al. 2021

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“…It is worth noting that deep-seated landslides such as Aniangzhai cannot directly react to rainfall, since the changing of groundwater conditions towards activation of the sliding plane requires some time until the surface runoff has been infiltrated to a certain depth (Iverson 2000;Vallet et al 2016). In the normal non-flooding seasons, toe erosion of the landslide should be a constantly ongoing process as well, leading to a backward propagation of deformation in the upslope direction until the time of failure (Teshebaeva et al 2015;Leroueil and Locat 2020). In this process, rainfall does not play a direct role, but as an indirect one usually occurring with a lag in time (Iverson 2000;Teshebaeva et al 2015;Haghshenas Haghighi and Motagh 2016;Vallet et al 2016).…”

Section: Landslidesmentioning

confidence: 99%

The June 2020 Aniangzhai landslide in Sichuan Province, Southwest China: slope instability analysis from radar and optical satellite remote sensing data

Xia

Motagh

et al. 2021

Landslides

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A large, deep-seated ancient landslide was partially reactivated on 17 June 2020 close to the Aniangzhai village of Danba County in Sichuan Province of Southwest China. It was initiated by undercutting of the toe of this landslide resulting from increased discharge of the Xiaojinchuan River caused by the failure of a landslide dam, which had been created by the debris flow originating from the Meilong valley. As a result, 12 townships in the downstream area were endangered leading to the evacuation of more than 20000 people. This study investigated the Aniangzhai landslide area by optical and radar satellite remote sensing techniques. A horizontal displacement map produced using cross-correlation of high-resolution optical images from Planet shows a maximum horizontal motion of approximately 15 meters for the slope failure between the two acquisitions. The undercutting effects on the toe of the landslide are clearly revealed by exploiting optical data and field surveys, indicating the direct influence of the overflow from the landslide dam and water release from a nearby hydropower station on the toe erosion. Pre-disaster instability analysis using a stack of SAR data from Sentinel-1 between 2014 and 2020 suggests that the Aniangzhai landslide has long been active before the failure, with the largest annual LOS deformation rate more than 50 mm/yr. The 3-year wet period that followed a relative drought year in 2016 resulted in a 14% higher average velocity in 2018–2020, in comparison to the rate in 2014–2017. A detailed analysis of slope surface kinematics in different parts of the landslide indicates that temporal changes in precipitation are mainly correlated with kinematics of motion at the head part of the failure body, where an accelerated creep is observed since spring 2020 before the large failure. Overall, this study provides an example of how full exploitation of optical and radar satellite remote sensing data can be used for a comprehensive analysis of destabilization and reactivation of an ancient landslide in response to a complex cascading event chain in the transition zone between the Qinghai-Tibetan Plateau and the Sichuan Basin.

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“…For a prone to fall rock fragment to reach a point within a given period of time (event C), it must be released from the source area (event A) and propagate (or travel) from the source to the point considered (event B). So, the probability of the event C is the probability of the event A multiplied by the probability of the event B, given the event A has occurred [27][28][29]: .…”

Section: Localized Hazardmentioning

confidence: 99%

Definitions and Concepts for Quantitative Rockfall Hazard and Risk Analysis

Hantz¹,

Corominas²,

Crosta³

et al. 2021

Preprint

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There is an increasing need for quantitative rockfall hazard and risk assessment that requires a precise definition of the terms and concepts used for this particular type of landslide. This paper suggests to use terms that appear to be the more logic and explicit as possible, and describes methods to derive some of the main hazard and risk descriptors. The terms and concepts presented concern the rockfall process (failure, propagation, fragmentation, modelling) and the hazard and risk descriptors, distinguishing the cases of localized hazards and diffused hazards. For a localized hazard, the failure probability of the considered rock compartment in a given period of time has to be assessed and the probability for a given element at risk to be impacted with a given energy must be derived combining the failure probability, the propagation probability and the exposure of the element. For a diffuse hazard that is characterized by a failure frequency, the number of rockfalls reaching the element at risk per unit of time and with a given energy (reach frequency) can be derived. However, when the element at risk is not replaced or repaired, the probability that it is impacted by at least one rockfall must be considered.

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Slope movements — Geotechnical characterization, risk assessment and mitigation

Cited by 12 publications

References 7 publications

Definitions and Concepts for Quantitative Rockfall Hazard and Risk Analysis

Definitions and Concepts for Quantitative Rockfall Hazard and Risk Analysis

The June 2020 Aniangzhai landslide in Sichuan Province, Southwest China: slope instability analysis from radar and optical satellite remote sensing data

Definitions and Concepts for Quantitative Rockfall Hazard and Risk Analysis

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