A depth‐integrated, coupled SPH model for flow‐like landslides and related phenomena

Pastor, M.; Haddad, B.; Sorbino, Giuseppe; Cuomo, Sabatino; Drempetic, V.

doi:10.1002/nag.705

Cited by 378 publications

(239 citation statements)

References 49 publications

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“…Some of the approaches available in the literature either treat the moving mass as a single phase incompressible fluid [6,4,7], or artificially separate the initiation and the propagation stages without reproducing the transition from one to another [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, in the last decades, several numerical approaches have been developed [1,2,3,4,5] with the aim of assessing the vulnerability and the risk for the environment and, eventually, designing mitigation measures. However, the theoretical analysis of the movement of granular masses is not straightforward since the considerable complexity of the phenomenon is still far to be understood.…”

Section: Introductionmentioning

confidence: 99%

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A visco‐elasto‐plastic model for granular materials under simple shear conditions

Redaelli

Prisco

Vescovi

2015

Num Anal Meth Geomechanics

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SUMMARYThe numerical simulation of rapid landslides is quite complex mainly because constitutive models capable of simulating the mechanical behaviour of granular materials in the pre-and post-collapse regimes are still missing. The goal of this paper is to introduce a constitutive model capable of capturing the response of dry granular flows from quasi-static to dynamic conditions, in particular when the material experiences a sort of from solid to fluid phase transition. An ideal assembly of identical spheres under simple shear conditions is condsidered. In the constitutive model, void ratio and granular temperature have been chosen as state variables, and both shear and normal stresses are computed as the sum of two contributions: the quasi static and the collisional one. The former one is determined by using a perfect elasto-plastic model including the critical state concept, while the latter one is derived from the kinetic theory of granular gases. The evolution of the granular temperature, fundamentally governing the material phase transition, is obtained by imposing the kinetic fluctuating energy balance. The constitutive relationship has been integrated, under both constant pressure and constant volume conditions, and the influence of shear strain rate, initial void ratio and normal pressure on the mechanical response has been investigated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A visco‐elasto‐plastic model for granular materials under simple shear conditions

Redaelli

Prisco

Vescovi

2015

Num Anal Meth Geomechanics

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“…Rainfall-induced landslides of the flow type (Hungr et al 2001) in granular soi ls are among the most complex natural hazards due to the variety of mechanisms, which regulate the failure and propagation stages (Cascini et al 2010;Pastor et al 2009;Picarelli et al 2008;Savage and Hutter 1991). Among these, the so-called "debris avalanches" still pose major challenges to researchers and practitioners due to the absence of a unique classification system and a consistent mathematical framework for their analysis.…”

Section: Introductionmentioning

confidence: 99%

Inception of debris avalanches: remarks on geomechanical modelling

2012

Self Cite

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Debris avalanches are complex phenomena due to the variety of mechanisms that control the failure stage and the avalanche formation. Regarding these issues, in the literature, ei ther field evidence or qualitative interpretations can be found while few experimental laboratory tests and rare examples of geomechanical modelling are available for technical and/or scientific purposes. As a contribution to the topic, the paper firstly highlights as the problem can be analysed referring to a unique mathematical framework from which different modelling approaches can be derived based on limit equilibrium method (LEM), finite element method (FEM), or smooth particle hydrodynamics (SPH). Potentialities and limitations of these approaches are then tested for a large study area where huge debris avalanches affected shallow deposits of pyroclastic soils (Sarno-Quindici, Southern Italy). The numerical results show that LEM as well as uncoupl ed and coupled stress-strain FEM analyses are able to individuate the major triggering mechanisms. On the other hand, coupled SPH analyses outline the relevance of erosion phenomena, which can modify the kinematic features of debris ava lanches in their source areas, i.e. velocity, propagation patterns and later spreading of the unstable mass. As a whole, the obtained results encourage the application of the introduced approaches to further analyse real cases in order to enhance the current capability to forecast the inception of tl1ese dangerous phenomena.

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“…These methods can obtain precise results in certain situations, but there are still some difficulties that these methods cannot deal with, such as the grid distortion induced by large deformation. The analysis of the entire process from rainfall impact to final accumulation, the coupling between skeleton and pore fluids, and large deformation are very important to get more precise mechanism of slope and levee failure 6) . For traditional Computational Fluid Dynamics (CFD) methods, it is difficult to deal with deformation boundary and the interface of different phases, especially in an irregularly shaped model, because these methods are based on an Euler method where grids are fixed on the model space.…”

Section: Introductionmentioning

confidence: 99%

“…Pastor et al adopted the Zienkiewicz-Biot model to simulate the interaction between water and soil for the flow-like landslide 6) . Maeda et al 8) used SPH method to simulate the seepage failure of dike.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Slope and Levee Failure under Heavy Rainfall Using the Three-phase SPH Model

Zhang

2014

JJSCE A2

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The failure of slope and levee triggered by heavy rainfall is a great threat to people's lives and properties, thus this research aimed at proposing a new numerical simulation tool and investigating the failure mechanism of slope and levee under heavy rainfall. The new Smoothed Particle Hydrodynamics (SPH) model with the coupling of three phases, water, soil and air, has been proposed based on the basic principles. Using the proposed SPH program, the rising and burst of air bubble in water was simulated to validate the application in fluid phase (water and air). After that, a conceptual slope model with different coefficients of permeability has been built and analyzed by the SPH model. The simulated infiltration showed that the proposed SPH model can simulate the interaction force between soil and water well. The model test of slope failure conducted before was simulated by the proposed SPH model with two cases, one without the effect of air phase and another one with the effect of air phase. The infiltration process, slope deformation and air behavior were revealed from the three-phase SPH simulations and the results proved that the proposed SPH model could be a useful tool to evaluate the stability of slope and levee under heavy rainfall.

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A depth‐integrated, coupled SPH model for flow‐like landslides and related phenomena

Cited by 378 publications

References 49 publications

A visco‐elasto‐plastic model for granular materials under simple shear conditions

A visco‐elasto‐plastic model for granular materials under simple shear conditions

Inception of debris avalanches: remarks on geomechanical modelling

Numerical Simulations of Slope and Levee Failure under Heavy Rainfall Using the Three-phase SPH Model

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