Evaluation of Geogrid-Reinforced Pile-Supported Embankments under Cyclic Loading Using Discrete Element Method

Han, Jie; Bhandari, Anil

doi:10.1061/41025(338)8

Cited by 22 publications

(14 citation statements)

References 13 publications

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“…It also allows extending the parametric studies. Han and Bhandari [11] figured out the plastic strain cumulation in the embankment. Han et al [3] investigated the influence of the dynamic loading amplitude effect and embankment height on the soil arching.…”

Section: Introductionmentioning

confidence: 99%

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

Phạm

Dias

2021

Applied Sciences

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This paper is based on small-scale laboratory tests (1:10) of a rigid inclusion-improved soil under normal gravity. A low area improvement ratio (2.4%) under monotonic and cyclic loading was used. 3D numerical calculations are performed to model these tests. The proposed numerical modeling is performed by the finite element method (FEM) using the ABAQUS software. A representative elementary volume model is suggested for reducing the calculation time. A hypoplastic constitutive model (HYP model) is applied for the load transfer platform (LTP). A total of three geometrical configuration cases of the experimental tests are numerically considered including a rigid slab over a mattress of 100 mm on the reinforced soil, a mattress of 100 mm on the reinforced soil, and a rigid slab over a mattress of 50 mm on the reinforced soil. The proposed numerical results are compared to the experimental data and the previous numerical results of Houda. The cyclic response of the systems is shown in terms of soil arching and settlements. The decrease in pile efficacy and the cumulative settlements are exhibited. The HYP model allows to better simulate the soil arching mechanisms inside the LTP than the CYsoil model used in the Houda’s research work. A good concordance between the proposed numerical results and the experimental data was obtained.

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Section: Introductionmentioning

confidence: 99%

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

Phạm

Dias

2021

Applied Sciences

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“…The Excel workbook incorporates factors like thickness and type of the bridging soil layer, type of geosynthetic reinforcement, and the embankment settlement . Other studies related to geosynthetic‐reinforced earth platform can be found elsewhere …”

Section: Introductionmentioning

confidence: 99%

“…74 Other studies related to geosynthetic-reinforced earth platform can be found elsewhere. [75][76][77][78][79][80][81][82][83][84][85] Rui et al 86 used the discrete element method (DEM) to study the pile-supported earth platform without geosynthetic reinforcement. The DEM microparameters were calibrated against tests based on sand specimens.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the effect of rigid inclusions on existing railroads

Wang

Sánchez

Briaud

2019

Num Anal Meth Geomechanics

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Summary Railroad track problems have been exacerbated by the continuous increase in freight loads and train traffic. The need to implement soil improvement technique in a relatively short window‐time (ie, to minimize train‐traffic disruption) is a key aspect to be considered when adopting a convenient remedial solution to control settlements in railroads constructed on problematic subgrades. Rigid inclusions are selected in this paper because they are reliable solutions relatively easy to implement. Furthermore, they can be used in different ground conditions and are suitable for short construction times (eg, do not require a curing time, as in grouting methods). Typical (analytical) methods for the design of rigid inclusions are adopted in this paper to define an optimal distribution of piles for the case of existing railroads. The selected layout is then analyzed in detail by means of a 3‐D dynamic finite element simulator using both, elastoplastic and elastic models. The performance of rigid inclusions is studied considering different operational scenarios, with dynamic and static loads, as well as involving subgrades with different plasticity index values. It is found that the predictions from the analytical design methods for rigid inclusion tend to be unconservative when compared against the finite element results. As for the numerical solutions, the most unfavorable stress condition is associated with the dynamic elastoplastic finite element solution. It is estimated that the rigid inclusions will contribute to a reduction in the ground settlements of around 15% to 20%, depending on the subgrade plasticity index.

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“…Sous chargement cyclique, les travaux numériques publiés à ce jour s'intéressent plus particulièrement au cas de chargement répété de type trafic routier ou ferroviaire, traités par éléments finis (Heitz, 2006 ;Arwanitaki et Triantafyllidis, 2006) ou par éléments discrets (Han et Bhandari, 2009 ;Villard et Grange, 2013), ou étudient le comportement des ouvrages renforcés par inclusions rigides sous sollicitations sismiques (Thai Son et al, 2010 ;Santruckova, 2012).…”

Section: Introductionunclassified

Massifs de sol renforcés par inclusions rigides : analyse de l’effet d’un chargement cyclique vertical quasi statique par expérimentation sur modèle réduit et validation numérique

2016

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Les recommandations publiées par le projet national français d'amélioration du sol par inclusions rigides (ASIRI) ont été limitées aux cas de chargement monotone. Cependant, différents cas de structures sous chargement cyclique sont couramment rencontrés dans la pratique, ce qui nécessite de comprendre le comportement sous chargement cyclique et/ou dynamique de ces ouvrages. Le travail de recherche présenté dans cet article constitue une contribution à la compréhension du comportement de cette technique lors d'un chargement cyclique vertical quasi statique. La première étape du travail a consisté en la réalisation d'une campagne d'essais sur un modèle réduit en laboratoire simulant le cas d'inclusions rigides avec ou sans dallage en surface et mettant en oeuvre une méthode de corrélation d'images. La modélisation physique nous a permis d'étudier l'influence de la présence du dallage à la surface de la plateforme de transfert de charge (PTC) et du préchargement sur le comportement de cette technique sous chargement cyclique. Les résultats expérimentaux montrent une accumulation des tassements durant le chargement cyclique quelle que soit la condition limite appliquée en surface. Ils montrent également que la présence du dallage augmente l'accumulation observée durant les cycles. En revanche, elle conduit à une réduction du tassement total lors d'un chargement monotone ultérieur. Dans un deuxième temps, les résultats expérimentaux ont été utilisés comme une base de données pour la validation d'un modèle numérique en milieu continu avec le logiciel FLAC 3D .Mots clés : amélioration de sol / inclusions rigides / plateforme de transfert de charge / chargement cyclique / modélisation physique / corrélation d'images / modélisation numérique Abstract -Soil reinforcement by rigid piles: analysis of the influence of vertical cyclic quasi-static loading by experimentation on small-scale model and numerical validation. The recommendations established by the French National Project on soil reinforcement by rigid inclusions (ASIRI) were limited to the case of monotonic loading. Yet, various cases of structures under cyclic loading are commonly encountered in the practice, which requires the understanding of this technique under cyclic and/or dynamic loading. The research work presented in this paper is a contribution to the understanding of the behaviour of this type of structures under a quasi-static vertical cyclic loading. The first step of the study consists in performing a series of tests on a small-scale laboratory model simulating the case of rigid inclusions with or without rigid slab at the ground surface and implementing a digital image correlation method. The parametric study performed with the physical modeling allowed us to study the influence of the presence of a rigid slab at the surface of the load transfer platform (LTP) and of the preloading on the behaviour of this technique under cyclic loading. The experimental results highlighted an accumulation of the settlements during the cyclic loading in both cases: ...

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Evaluation of Geogrid-Reinforced Pile-Supported Embankments under Cyclic Loading Using Discrete Element Method

Cited by 22 publications

References 13 publications

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

Numerical study on the effect of rigid inclusions on existing railroads

Massifs de sol renforcés par inclusions rigides : analyse de l’effet d’un chargement cyclique vertical quasi statique par expérimentation sur modèle réduit et validation numérique

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