A depth-integrated viscoplastic model for dilatant saturated cohesive-frictional fluidized mixtures: Application to fast catastrophic landslides

Pastor, M.; Blanc, Thomas; Pastor, Manuel

doi:10.1016/j.jnnfm.2008.07.014

Cited by 59 publications

(48 citation statements)

References 43 publications

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“…In practice, an important case is that of dry soils where the time scale of air pore pressure dissipation is similar to that of propagation of the landslide. In this case, pore pressures of the interstitial air can play a paramount role, and in the limit it is possible to arrive at 'dry liquefaction' [12,13]. Nevertheless, this assumption is still reasonable in the following two cases where the soil can be approximated as a single-phase material:…”

Section: Boundaries In Bonded-granular Cut Slopementioning

confidence: 99%

“…The behaviour can be assumed to be of undrained type. Material behaviour can be approximated using rheological models [12,13].…”

Section: Boundaries In Bonded-granular Cut Slopementioning

confidence: 99%

“…(a) Experiments on a granular avalanche in a convex and concave curve chute [7] or on granular flows down a rough inclined plane [8]; physical model tests such as centrifuge tests on soil slopes under different conditions, such as rainfalls [9,10] or shaking [11]; (b) Numerical analyses mainly by the finite element method [12][13][14] or by the distinct element method.…”

Section: Introductionmentioning

confidence: 99%

“…Concerned with the initiation, slope failures can be triggered by different causes: (a) changes of effective stresses induced by external load (earthquakes, human action), pore pressures (rainfalls), or changes of geometry (excavation or construction), and (b) material degradation due to weathering and chemical attack [12,13,24]. Deformation is sometimes concentrated in a narrow zone, i.e., the failure surface.…”

Section: Introductionmentioning

confidence: 99%

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Distinct element method analyses of idealized bonded-granulate cut slope

Jiang

Murakami

2012

Granular Matter

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This paper presents a numerical study of idealized bonded-granulate cut slope subject to sudden strength reduction. A 2-D Distinct Element Method (DEM) has been used to carry out a simulation of full-process slope failure with focus on very-rapid and extremely-rapid landslide process. The numerical results show that during the landslide process: (1) the soil moves either in a rather random/chaotic way (diffuse failure) or in different curved shear bands (localized failure). The soil close to slope surface moves along downward slope while the soil close to the slope toe moves significantly in the horizontal direction. The landslide experiences very rapid flow most of the time, with its maximum velocity increaseing obviously with time at first to its peak value, then decreasing gradually to zero. (2) The soil close to slope undergo a repeated loading and unloading process, and an evident rotation of principal stresses. Their stress state may arrive slightly over the peak strength envelope as a result of extremely rapid flow. (3) There is little grain-size effect for the grains at low velocity, but an evident grain-size effect for the grains at high velocity, with large-size grains tending to move fast. (4) The post-failure inclination is much smaller than the peak/residual internal friction angle of the material.

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Section: Boundaries In Bonded-granular Cut Slopementioning

confidence: 99%

“…The behaviour can be assumed to be of undrained type. Material behaviour can be approximated using rheological models [12,13].…”

Section: Boundaries In Bonded-granular Cut Slopementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distinct element method analyses of idealized bonded-granulate cut slope

Jiang

Murakami

2012

Granular Matter

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“…The method was also successfully applied to reproduce real case studies (Pastor et al 2009b;Haddad et al 2010). The real topography used here corresponds to the Colima Volcano, which is the most active volcano in Mexico, and as a result of its location in a climate zone with heavy rains, secondary processes such as lahars triggered by rain mixing with loose pyroclastic debris are common, damaging infrastructures, private property, or even small villages in the surrounding area.…”

Section: Introductionmentioning

confidence: 99%

Runout and deposit morphology of Bingham fluid as a function of initial volume: implication for debris flow modelling

et al. 2014

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Debris flow modelling has become an important tool for assessing the related hazard so as to undertake appropriate mitigation actions and reduce the associated risk. Volume values are key input data for landslides numerical modelling. This work analyses the influence of the uncertainties related to initial volume and initial mass morphology (using the aspect ratio as a parameter) on the spreading of Bingham fluid. The dependency of this effect on slope changes is also analysed using three interesting landscape configurations: a horizontal plane, a simplified bilinear topography with increasing slope angle, and a real topography (Colima volcano landscape). We use the smoothed particle hydrodynamics (SPH) model to carry out this analysis. The SPH model is a depth-integrated model, which was previously validated by reproducing problems with analytical results (1D break dam). The initial aspect ratio is a primordial control parameter of the spreading in the case of a quasi-horizontal plane or very gentle slope, but this effect dissipates when the slope angle increases and the flow dynamics become essentially controlled by its volume. Even if most hydrodynamic models using different rheological approach can successfully reproduce real events, input data uncertainties and model sensitivity should be taken into account.

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Beyond Failure: Modeling of Fluidized Geomaterials

2022

Computational Geomechanics

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A depth-integrated viscoplastic model for dilatant saturated cohesive-frictional fluidized mixtures: Application to fast catastrophic landslides

Cited by 59 publications

References 43 publications

Distinct element method analyses of idealized bonded-granulate cut slope

Distinct element method analyses of idealized bonded-granulate cut slope

Runout and deposit morphology of Bingham fluid as a function of initial volume: implication for debris flow modelling

Beyond Failure: Modeling of Fluidized Geomaterials

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