Pullout Tests Using Steel Grid Reinforcements with Low‐Quality Backfill

A simple model for the corrosion-induced loss of stiffness and strength of the steel strips of earth-reinforced walls was introduced in a finite element simulation of the long-term behavior of the wall, in which the backfill-strips interactions are taken into account by means of a generalized homogenization procedure (called a multiphase model). The results show an initial phase of slow displacements induced by the loss of stiffness, followed after a few decades by a steep acceleration of the displacements, leading to wall failure. The influences of the parameter controlling corrosion, the backfill cohesion and the heterogeneity of the corrosion process are discussed. Results are used to discuss a strategy for reinforced earth wall surveillance. Copyright

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“…• using 'discrete' models, in which each strip is discretized (see, for instance, among many others, [2,3,5,6,18,22]),…”

Section: Different Ways To Model the Stripsmentioning

confidence: 99%

Finite element analysis of the effect of corrosion on the behavior of reinforced earth walls

Chau

Bourgeois

Corfdir

2011

Num Anal Meth Geomechanics

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“…This may be attributed to the effect of restricted soil dilatancy when the soil is sheared during geogrid pullout (e.g. Bergado et al 1992, Yasufuku et al 2004. Dense soils have a tendency to dilate when sheared.…”

Section: Effect Of Unloading and Reloadingmentioning

confidence: 99%

“…The failure mechanism is based upon the Terzaghi-Buisman bearing capacity equation for a strip footing, as mentioned by Jones (1996). Peterson and Anderson (1980) provided an expression that forms the upper-bound estimation while considering a normal characteristics field for a foundation rotated to the horizontal (Bergado et al 1992). Passive resistance depends on the area of transverse elements, the effective vertical stress, and the friction angle of the soil (Izawa et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Influence of unloading–reloading processes on the pullout resistance of geogrid

Giang

Kuwano

Izawa³

et al. 2010

Geosynthetics International

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This study presents an evaluation of soil-geogrid interaction mechanisms. Pullout tests were carried out on different types of geogrid to evaluate the effects of transverse ribs and dilatancy characteristics of sand around the geogrid during unload-reload processes. The interaction was observed using particle image velocimetry and analyzed using a spatial discretization scheme in the finite element method to understand the dilatancy mechanism and the shear strain distribution.

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“…Another particular concern is the modelling of the interface between soil and reinforcing strips. Special interface elements have been introduced to simulate the interface behaviour [8,9]. Homogenization methods have also been introduced for limit analysis [10] or for elastic behaviour modelling [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the response of a reinforced wall to a high speed train passage

Corfdir

Bourgeois²,

Payeur

2017

Int. J. Numer. Anal. Meth. Geomech.

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The dynamic response of a mechanically stabilized earth wall to the passing of a high-speed train is modelled using the finite element method. A three-dimensional analysis is carried out, using a specific framework that allows performing the analysis with a moderate computational effort. In the first place, a so-called multiphase approach is used to take into account the reinforcing strips. The moving load is taken into account by performing the calculation in a mobile referential using the properties of symmetry of the train cars and a simplifying assumption of periodicity for the whole train. We also assume a steady state. A partial validation of the approach is obtained by means of a comparison with an analytical solution. The quick increase in displacements induced by the train passing when the speed comes close to the celerity of Rayleigh waves clearly appears in the results. The vertical displacements, vertical stresses in the backfill,tensile forces in the strips and the influence of the stiffness of the soil are discussed.La réponse dynamique d'un mur en sol renforcé au passage d'un train à grande vitesse est modélisée par éléments finis. Une analyse tridimensionnelle est effectuée, dans un cadre spécifique qui permet de faire le calcul pour un cout de calcul acceptable : d'une part, on utilise le modèle multiphasique pour prendre en compte les armatures ; d'autre part, on prend en compte le déplacement de la charge en effectuant le calcul dans un référentiel mobile ; enfin on tire parti des propriétés de symétrie des voitures et on fait une hypothèse simplificatrice de périodicité du train. On fait de plus l'hypothèse que l'on a atteint un régime permanent. Une validation partielle est obtenue par comparaison avec une solution analytique. L'augmentation des déplacements induits par le passage du train lorsque sa vitesse s'approche de la célérité des ondes de Rayleigh apparait clairement dans les résultats. Les déplacements verticaux, les contraintes verticales dans le remblai, les efforts de traction dans les armatures et l'influence de la raideur du remblai sont discutées

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Pullout Tests Using Steel Grid Reinforcements with Low‐Quality Backfill

Cited by 32 publications

References 5 publications

Finite element analysis of the effect of corrosion on the behavior of reinforced earth walls

Finite element analysis of the effect of corrosion on the behavior of reinforced earth walls

Influence of unloading–reloading processes on the pullout resistance of geogrid

Numerical simulation of the response of a reinforced wall to a high speed train passage

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