Evaluation of a Predictive Constitutive Model for Sands

Andrade, José E.; Ellison, Kirk

doi:10.1061/(asce)1090-0241(2008)134:12(1825)

Cited by 17 publications

(11 citation statements)

References 10 publications

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“…The results showed in Figure 10a proved that a small perturbation in void ratio can cause large changes in postpeak behavior and undrained strength at large strains. These results present similar tendencies also showed in experimental and theoretical results in other researches [20,26,27]. The study presented in [26] considered another constitutive model (MIT-S1), and part of the results are highlighted below [26].…”

Section: Nor Sand -Undrained Triaxial Compression Of Loose Sandssupporting

confidence: 85%

Application of Nor Sand Constitutive Model in a Highway Fill Embankment Slope Stability Failure Study

Leao

2018

CivileJournal

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This paper presents a case study of a static load induced liquefaction in a simple roadway widening project constructed in north eastern part of Ohio in 2008. The widening required an embankment fill, which moved nearly 4 feet vertically and 1 foot laterally after two days of installation. The main objective of the work is to demonstrate how a simple Constitutive model, in this case Nor Sand model, can represent the static liquefaction in loose sand layers under specific conditions. A set of parameters is assumed based on the soil properties and an Excel Spreadsheet is used for simulations of triaxial compression of sand. It was considered that the situation which led to the failure, and the situation after the solution adopted. Moreover, slope stability analysis is provided for validation of the original results using a commercial software. It was found that the model can represent through stress strain curves and stress paths the behavior of the soil layer which led to the embankment fill movement. As the original work considered only slope stability analysis to explain this phenomenon, the present study shows a different approach for the case study, and this is the main contribution of this research.

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Section: Nor Sand -Undrained Triaxial Compression Of Loose Sandssupporting

confidence: 85%

Application of Nor Sand Constitutive Model in a Highway Fill Embankment Slope Stability Failure Study

Leao

2018

CivileJournal

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“…For quasi-static loading conditions, the behaviour is solid-like, while the behaviour of a flowing granular material typically is liquid-like [35]. The study of B Simon Larsson simon.larsson@ltu.se 1 Division of Mechanics of Solid Materials, Luleå University of Technology, SE-97187 Luleå, Sweden 2 Mechanical Engineering Department, EAFIT University, Medellín, Colombia granular material flow is of importance in many industries, such as the mining industry, the pharmaceutical industry and the agricultural industry. Numerical modelling and simulation provide insight into mechanisms of granular material flow that are difficult or impossible to study experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, when the continuum approach has been used for modelling of solid-like granular material behaviour, strain-rate-independent plasticity models, originating from Mohr-Coulomb plasticity, have been used, see e.g. [2,17,54,64]. In the literature [56], it has been shown that the mechanical behaviour of granular materials is strain rate independent in the quasi-static regime and strain rate dependent in the flow regime.…”

Section: Introductionmentioning

confidence: 99%

The particle finite element method for transient granular material flow: modelling and validation

et al. 2020

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The prediction of transient granular material flow is of fundamental industrial importance. The potential of using numerical methods in system design for increasing the operating efficiency of industrial processes involving granular material flow is huge. In the present study, a numerical tool for modelling dense transient granular material flow is presented and validated against experiments. The granular materials are modelled as continuous materials using two different constitutive models. The choice of constitutive models is made with the aim to predict the mechanical behaviour of a granular material during the transition from stationary to flowing and back to stationary state. The particle finite element method (PFEM) is employed as a numerical tool to simulate the transient granular material flow. Use of the PFEM enables a robust treatment of large deformations and free surfaces. The fundamental problem of collapsing rectangular columns of granular material is studied experimentally employing a novel approach for in-plane velocity measurements by digital image correlation. The proposed numerical model is used to simulate the experimentally studied column collapses. The model prediction of the in-plane velocity field during the collapse agrees well with experiments.

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“…There are numerous constitutive models for sands available in the literature (e.g. Jefferies, 1993;Andrade & Borja, 2006;Andrade & Ellison, 2008). However, in this paper the Dafalias & Manzari (2004) model is selected for its versatility in capturing CDS paths, which will be simulated in the following section.…”

Section: Constitutive Modelmentioning

confidence: 99%

Modelling diffuse instabilities in sands under drained conditions

Ramos-Cañón¹,

Andrade²,

Lizcano³

2012

Géotechnique

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This paper presents a criterion for detecting diffuse (homogeneous) instabilities in granular soils sheared under fully drained conditions. The criterion is based on bifurcation theory and applied to elasto-plasticity by allowing multiple incremental solutions in elasto-plastic soils, physically losing controllability of stress boundary conditions. Drained diffuse instabilities are poorly understood, and are induced by kinematic modes different from those observed in shear bands and liquefaction instabilities. Unlike shear bands, diffuse instabilities occur under fairly homogenous deformation modes and, unlike liquefaction, drained instabilities are not generated by the excess pore pressures. Recent experiments under drained constant shear report sudden homogeneous instabilities in samples of relatively dense and loose sands. The criterion presented in this paper is used in conjunction with an elasto-plasticity model for sands to predict and explain these reported drained instabilities. From a practical standpoint, these developments serve to expand the repertoire of potential instabilities that occur well before failure, and which have been reported in case studies of puzzling slope instability failures under fully drained conditions. KEYWORDS: failure; numerical modelling; plasticity; sands; theoretical analysis Cette communication présente un critère pour la détec-tion d'instabilités diffuses (homogènes) dans des sols granulaires cisaillés, et dans des conditions entièrement drainées. Ce critère est basé sur la théorie de la bifurcation, et appliqué à l'élastoplasticité, en permettant des solutions incrémentielles multiples dans des sols élasto-plastiques -en perdant physiquement de la contrôlabilité dans des conditions limites des contraintes. Les instabilités diffuses drainées sont mal connues ; elles sont induites par des modes cinématiques différents de ceux que l'on relève dans des bandes de cisaillement et des instabilités de liquéfaction. Contrairement aux bandes de cisaillement, des instabilités diffuses se produisent dans des modes de déformation homogènes, et, contrairement à la liquéfaction, des instabilités drainées ne sont pas produites sous l'effet de pressions interstitielles excessives. Des expériences menées récemment dans des conditions de cisaillement constant drainé font état d'instabilités homogènes soudaines dans des échantillons de sable relativement dense et meuble. Le critère présenté dans la présente communication est utilisé conjointement avec un modèle d'élastoplasticité pour les sables, afin de prédire et d'expliquer ces instabilités drainées signalées. D'un point de vue pratique, ces développements servent à accroître le répertoire d'instabilités potentielles survenant bien avant la rupture, et qui ont été signalées dans des études de cas présentant des instabilités de pentes intrigantes dans des conditions entièrement drainées.

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Evaluation of a Predictive Constitutive Model for Sands

Cited by 17 publications

References 10 publications

Application of Nor Sand Constitutive Model in a Highway Fill Embankment Slope Stability Failure Study

Application of Nor Sand Constitutive Model in a Highway Fill Embankment Slope Stability Failure Study

The particle finite element method for transient granular material flow: modelling and validation

Modelling diffuse instabilities in sands under drained conditions

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