Effect of Anisotropy and Destructuration on the Behavior of Murro Test Embankment

Karstunen, Minna; Krenn, Harald W.; Wheeler, Simon J.; Koskinen, Mirva; Zentar, R.

doi:10.1061/(asce)1532-3641(2005)5:2(87)

Cited by 128 publications

(109 citation statements)

References 14 publications

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“…Parameters a and b relate to the third additional hardening law used in the model, which describes the degradation of bonding with plastic straining. Parameter a controls the absolute rate of destructuration and parameter b defines the relative effectiveness of plastic shear (deviatoric) and volumetric strains [24]. For this constitutive model the slope of the post yield compression line,  , corresponds to an intrinsic value, i  , which can be obtained from oedometer tests on reconstituted samples.…”

Section: Numerical Modelmentioning

confidence: 99%

“…To clarify the influence that the changes in the state of soil due to column installation have on the settlement reduction caused by the columns on soft cohesive soils, the authors carried out numerical simulations using two advanced constitutive models, namely S-CLAY1 [23] and S-CLAY1S [24], which have been especially developed to represent natural structured soft soils, a common type of soils to be treated with stone columns. The Modified Cam clay model (MCC) [25] has also been used for comparison.…”

Section: Introductionmentioning

confidence: 99%

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Influence of stone column installation on settlement reduction

Castro

Karstunen

Sivasithamparam

2014

Computers and Geotechnics

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The paper presents numerical simulations investigating the settlement reduction caused by stone columns in a natural soft clay. The focus is on the influence of the soft soil alteration caused by column installation. A uniform mesh of end-bearing columns under a distributed load was considered. Therefore, the columns were modelled using the "unit cell" concept, i.e. only one column and the corresponding surrounding soil in axial symmetry. The properties of the soft clay correspond to Bothkennar clay, which is modelled using S-CLAY1 and S-CLAY1S, which are Cam clay type models that account for anisotropy and destructuration. The Modified Cam clay model is also used for comparison. Column installation was modelled independently to avoid mesh distortions, and soft soil alteration was directly considered in the initial input values.The results show that the changes in the stress field, such as the increase of radial stresses and mean stresses and the loss of overconsolidation, are beneficial for high loads and closely spaced columns but, on the contrary, may be negative for low loads, widely spaced columns and overconsolidated soils. Moreover, whilst the rotation of the soil fabric reduces the settlement, in contrast the soil destructuration during column installation reduces the improvement.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of stone column installation on settlement reduction

Castro

Karstunen

Sivasithamparam

2014

Computers and Geotechnics

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“…Thus a number of extensions to the MCC plasticity model have been proposed to represent this directional bias. These introduce some form of plastic anisotropy through rotation and/or shearing of the yield surface (for example see Belokas and Kavvadas (2010); Dafalias (1986); Gajo and Wood (2001); Karstunen and Koskinen (2008); Karstunen et al (2005); Pestana and Whittle (1999); Sivasithamparam et al (2010); Wheeler et al (2003); Whittle and Kavvadas (1994)). …”

Section: Critical State Geomechanicsmentioning

confidence: 99%

“…12 Previous extensions to the MCC model, such as the single-surface formulations of Karstunen et al (2005) and Wheeler et al (2003) require 8 constants whereas the more sophisticated two-surface models of Whittle and Kavvadas (1994) and Pestana and Whittle (1999) require 15 and 13 constants respectively. The recently proposed model of Sivasithamparam et al (2010) requires 10 constants, however it has no LAD or control over the shape of the ellipsoidal yield surface, leading to strength over-predictions for both non-compressive load paths and over-consolidated soil states.…”

Section: Calibrationmentioning

confidence: 99%

A unique Critical State two-surface hyperplasticity model for fine-grained particulate media

Coombs¹,

Crouch²,

Augarde³

2013

Journal of the Mechanics and Physics of Solids

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NOTICE: this is the author's version of a work that was accepted for publication in Journal of the Mechanics and Physics of Solids. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Journal of the Mechanics and Physics of Solids, 61, 1, 2013, 10.1016/j.jmps.2012.08.002. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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“…The behaviour of Bothkennar clay was modelled using two advanced constitutive models, namely S-CLAY1 (Wheeler et al 2003) and S-CLAY1S (Karstunen et al 2005). The Modified Cam Clay model (MCC) (Roscoe et al 1958) is also used for comparison purposes.…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical analyses of stone column installation in Bothkennar clay

Castro¹,

Karstunen²,

Sivasithamparam³

et al. 2013

Installation Effects in Geotechnical Engineering

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The paper presents the results of numerical simulations studying the installation effects of stone columns in a natural soft clay. Stone column installation is modelled as an undrained expansion of a cylindrical cavity, using the finite element code PLAXIS that allows for large displacements. The properties of the soft clay correspond to Bothkennar clay, a soft Carse clay from Scotland (UK). The complexity of this material is simulated via two advanced recently developed constitutive formulations able to account for the soil structure, namely S-CLAY1 and S-CLAY1S. Modified Cam Clay model is also used for comparison purposes. The paper shows the new stress field and state parameters after column installation and the subsequent consolidation process. This sets the basis for including installation effects in studying the settlement reduction caused by stone columns.

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Effect of Anisotropy and Destructuration on the Behavior of Murro Test Embankment

Cited by 128 publications

References 14 publications

Influence of stone column installation on settlement reduction

Influence of stone column installation on settlement reduction

A unique Critical State two-surface hyperplasticity model for fine-grained particulate media

Numerical analyses of stone column installation in Bothkennar clay

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