A state-dependent multi-mechanism model for sands

Fang, Huolang

doi:10.1680/geot.2003.53.4.407

Cited by 21 publications

(4 citation statements)

References 26 publications

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“…In this paper, the direction dependent behaviour of soil is formulated using the slip theory based multilaminate framework, which was originally developed by Pande and Sharma (1983) for the investigation of cohesive soils. There are various slip theory based formulations in literature which have been named differently based on the selection of sampling planes or static/kinematic constraint imposed to the framework, such as microplane framework from Prat and Bažant (1991) and multi-mechanism from Fang (2003). However, none of the available models can handle the evolving complex anisotropic behaviour of soil.…”

Section: Multilaminate Frameworkmentioning

confidence: 99%

A Semi-micromechanical Framework for Anisotropic Sands

Bayraktaroglu

Hicks

Korff

2022

Challenges and Innovations in Geomechanics

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In this paper, a state-dependent semi-micromechanical framework for anisotropic sands is proposed. A simple constitutive model based on critical state theory and bounding surface (BS) plasticity is used to describe idealized microlevel soil behaviour, and a slip theory based multilaminate framework employed to create a link between the micro and macro level responses of soil. A contact normal based second order fabric tensor is used to create a mathematical description of the anisotropic nature of sand. The proposed constitutive framework can reproduce various soil responses, stemming from both the inherent anisotropy which highly depends on the sample preparation method and induced anisotropy resulting from the applied stress path. This paper presents concise theoretical aspects of the multilaminate framework and the anisotropic elastoplastic constitutive formulation. Finally, the model's performance in predicting sand response is demonstrated under drained and undrained conditions at different stress states, relative densities and loading conditions by simulating Karlsruhe sand, and is examined through a comparison with two other sophisticated constitutive models for sand, namely the Dafalias and Manzari (2004) version of Sanisand and hypoplasticity with intergranular strain.

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Section: Multilaminate Frameworkmentioning

confidence: 99%

A Semi-micromechanical Framework for Anisotropic Sands

Bayraktaroglu

Hicks

Korff

2022

Challenges and Innovations in Geomechanics

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“…Based on this variable a class of constitutive models has then been defined (e.g. Muir Wood et al, 1994;Manzari & Dafalias, 1997;Li, 2002;Fang, 2003;Yang & Muraleethar- (Muir Wood et al, 1994;Gajo & Muir Wood, 1999) extended this concept by introducing a bounding surface in p-q-e space, which includes the CSL and is approached by the stress and volumetric state of soil when distortional strains are applied.…”

Section: Plasticitymentioning

confidence: 99%

Cyclic stress–strain response of compacted gravel

Modoni¹,

Koseki²,

Dan³

2011

Géotechnique

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The positive effect of artificial densification on the stress-strain performance of granular materials is acknowledged from very ancient times but its importance greatly increased after the development of powerful machineries for the construction of large earth and rockfill dams. It is, however, pointed out that the extensive exploitation of gravelly soil is rarely supported by a thorough analytical assessment of the compaction effects on the constitutive relationships of materials, as would be desirable considering the massive dimension of these works and the complexity of typical loading conditions. The present research aims to fill this gap by means of a detailed experimental investigation and a theoretical analysis on the stress-strain response of dense gravels under monotonic and cyclic loading. The experimental campaign consists of a large number of triaxial tests performed at different initial mean effective stresses, following different stress paths and sequences, on artificially reconstituted samples of large dimensions compacted at different initial densities. The great care placed in the accuracy of laboratory instrumentation enables a high repeatability of experimental results, which is necessary to provide a clear focus on non-linearity in the limited strain range of the pre-failure response of the gravel. Based on the curve-fitting method the ingredients of an elasto-plastic constitutive model have been defined to predict the response of gravel under monotonic and cyclic loading. Elastic stiffness is simulated with a model derived from the literature which assumes a dependency on soil density together with inherent and stress-induced anisotropy. Plastic strain development from different initial stress and volume states of gravel is simulated by a critical state, multiple yielding constitutive model. Hardening and flow rules for the latter have been obtained by modifying previously existing laws in order better to reproduce the observations under monotonic compression, extension and cyclic loading. Validation of the proposed model is finally provided by comparing simulations and experimental results in a variety of testing conditions.

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“…Simulations of the influences of PSR on soil behaviors have been attempted by using numerous models based on different theories. Examples are the multi‐mechanism model , microplane model , hypoplasticity , double shearing types of models , yield vertex theory , and so on. These models have been employed to study not only stress–strain responses of a single‐soil specimen in soil laboratories but also strain localization and geotechnical engineering boundary value problems .…”

Section: Introductionmentioning

confidence: 99%

A kinematic hardening soil model considering the principal stress rotation

Yang

2012

Num Anal Meth Geomechanics

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SUMMARY In this article, a typical and representative kinematic hardening soil model is first studied to investigate its capabilities to reproduce soil responses under principal stress rotations (PSR). It is found that the model is capable of reproducing the non‐coaxiality very well. It can qualitatively capture the trends of responses of different stress and strain components, without the capability to quantitatively reproduce these responses. Its prediction of volumetric responses is the poorest and can give wrong results in many cases. The underlying reasons for these capabilities and defects are analyzed in detail. The model is subsequently modified to better take into account the PSR influences. An additional new flow rule and plastic modulus for the PSR are developed. One important feature of the model is that it is developed in the general stress space with six stress variables. Therefore, it can take into account multiple PSRs at different directions. Another feature is that it retains the linear stress rate–strain rate relationship, which facilitates its numerical implementations. In addition, the universal characteristic of the theory makes it equally applicable to other kinematic hardening models. Copyright © 2012 John Wiley & Sons, Ltd.

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A state-dependent multi-mechanism model for sands

Cited by 21 publications

References 26 publications

A Semi-micromechanical Framework for Anisotropic Sands

A Semi-micromechanical Framework for Anisotropic Sands

Cyclic stress–strain response of compacted gravel

A kinematic hardening soil model considering the principal stress rotation

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