Landslide Motion Forecasting by a Dynamic Visco-Plastic Model

Secondi, M; Crosta, Giovanni B.; Prisco, Claudio di; Frigerio, Gabriele; Frattini, Paolo; Agliardi, Federico

doi:10.1007/978-3-642-31310-3_21

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…2, two different formulation for the viscous nucleus have been considered. The first, proposed in the original version of the model (Secondi et al 2011), was a bilinear function defined as:…”

Section: Viscous Nucleusmentioning

confidence: 99%

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Modelling Rockslide Displacements with Delayed Plasticity

Frigerio

Castellanza

Crosta

et al. 2014

Landslide Science for a Safer Geoenvironment

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To model the temporal evolution of complex landslides, a 1D pseudo-dynamic viscoplastic approach, based on Perzyna's theory, has been modified. In the original version of the model, the viscous nucleus has been assumed to be bi-linear: where irreversible deformations develop uniquely for positive yield function values whereas, in a more general case, it can also develop for negative values. In this work the model has been enriched by considering: (1) an exponential viscous nucleus, (2) a strain-rate softening to reduce friction angle as the sliding velocity increases and (3) block interaction forces to cope with complex 3D geometries for the sliding mass .The application of the proposed model to the Vajont slide emphasizes the role played by the strain-rate softening while the application to the La Saxe rockslide (Italy) clearly shows how a relatively simple model can be applied to a complex landslide by considering a spatial discretization of the sliding mass.

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Section: Viscous Nucleusmentioning

confidence: 99%

“…In this paper a previously presented 1D pseudo-dynamic visco-plastic model (Secondi et al 2011), based on Perzyna's theory is applied. The sliding mass is considered as a rigid block subject to its self-weight, inertial forces and seepage forces varying with time.…”

Section: Introductionmentioning

confidence: 99%

Modelling Rockslide Displacements with Delayed Plasticity

Frigerio

Castellanza

Crosta

et al. 2014

Landslide Science for a Safer Geoenvironment

Self Cite

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“…Predicting the evolution of existing landslides and first-failure phenomena is faced through many models that essentially belong to two broad categories, namely geotechnical models and phenomenological approaches. The former pursue several goals including the analysis of the temporal evolution of landslides and their instability (Duncan 1996;Alonso et al 2010;Ferrari et al 2011;Secondi et al 2013;Crosta et al 2014;Cotecchia et al 2016;Soga et al 2016;Bru et al 2018), but the results obtained for a specific landslide are valid for that one and can hardly be extended to other, albeit similar, phenomena. Hence, for forecasting purposes, quite often the technicians make use of phenomenological approaches.…”

Section: Introductionmentioning

confidence: 99%

Forecasting the landslide evolution: from theory to practice

2022

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This paper proposes a new, physically based, and mathematically consistent method for predicting the evolution of existing landslides and first-failure phenomena based on slope displacement measurements. The method is the latest step in a long-term research program and, as such, uses the preliminary framework introduced in two previous papers. The first characterizes slope movements through a limited number of displacement trends, and the second analyzes their dynamic characteristics. The approach is here extended to the prediction of landslide evolution and its validity and effectiveness are tested on landslides well known in the scientific literature for the accuracy of the studies carried out and, in some cases, for the consequences they have caused. Although the results obtained so far are very encouraging, in full awareness of the relevance and complexity of the subject matter, the authors emphasize that the method should be used, in the current state of knowledge, only by experienced professionals and especially for research purposes.

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“…When applying RAMMS DF on hillslope debris-flow events, Christen et al [19] reported markedly different back-calculated friction coefficients compared to those used for channelised debris flows. Hillslope debris flows seem to show a pronounced coherent viscoplastic flow behaviour [1,33,34]-a rheological property similar to dense snow avalanches. For these reasons, a nonlinear relationship between normal pressure and shear stress might be assumable for such processes as well.…”

Section: Introductionmentioning

confidence: 99%

2D Runout Modelling of Hillslope Debris Flows, Based on Well-Documented Events in Switzerland

et al. 2020

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In mountain areas, mass movements, such as hillslope debris flows, pose a serious threat to people and infrastructure, although size and runout distances are often smaller than those of debris avalanches or in-channel-based processes like debris floods or debris flows. Hillslope debris-flow events can be regarded as a unique process that generally can be observed at steep slopes. The delimitation of endangered areas and the implementation of protective measures are therefore an important instrument within the framework of a risk analysis, especially in the densely populated area of the alpine region. Here, two-dimensional runout prediction methods are helpful tools in estimating possible travel lengths and affected areas. However, not many studies focus on 2D runout estimations specifically for hillslope debris-flow processes. Based on data from 19 well-documented hillslope debris-flow events in Switzerland, we performed a systematic evaluation of runout simulations conducted with the software Rapid Mass Movement Simulation: Debris Flow (RAMMS DF)-a program originally developed for runout estimation of debris flows and snow avalanches. RAMMS offers the possibility to use a conventional Voellmy-type shear stress approach to describe the flow resistance as well as to consider cohesive interaction as it occurs in the core of dense flows with low shear rates, like we also expect for hillslope debris-flow processes. The results of our study show a correlation between the back-calculated dry Coulomb friction parameters and the percentage of clay content of the mobilised soils. Considering cohesive interaction, the performance of all simulations was improved in terms of reducing the overestimation of the observed deposition areas. However, the results also indicate that the parameter which accounts for cohesive interaction can neither be related to soil physical properties nor to different saturation conditions.

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Landslide Motion Forecasting by a Dynamic Visco-Plastic Model

Cited by 10 publications

References 8 publications

Modelling Rockslide Displacements with Delayed Plasticity

Modelling Rockslide Displacements with Delayed Plasticity

Forecasting the landslide evolution: from theory to practice

2D Runout Modelling of Hillslope Debris Flows, Based on Well-Documented Events in Switzerland

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