Generalized plasticity state parameter‐based model for saturated and unsaturated soils. Part II: Unsaturated soil modeling

Manzanal, Diego; Pastor, M.; Merodo, J. A. Fernández

doi:10.1002/nag.983

Cited by 68 publications

(33 citation statements)

References 41 publications

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“…Among them, the most recent constitutive frameworks (Jommi, 2000;Loret & Khalili, 2002;Gallipoli et al, 2003;Wheeler et al, 2003;Sheng et al, 2004;Pereira et al, 2005;Nuth & Laloui, 2007;Khalili et al, 2008;Mašín & Khalili, 2008;Manzanal et al, 2011;Hleibieh et al, 2014) include the effect of suction in the definition of effective stress, although this definition varies from model to model. Tamagnini (2004) formulated an extension to the Cam Clay model for partially saturated soils, replacing Terzaghi's Table 4.…”

Section: Constitutive Modelmentioning

confidence: 99%

Face stability of shallow tunnels in partially saturated soil: centrifuge testing and numerical analysis

Soranzo

Tamagnini

2015

Géotechnique

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In this paper the face stability of shallow tunnels in partially saturated soil is investigated by means of centrifuge testing and numerical analysis. A loess soil is chosen for this study and its properties are characterised by laboratory testing. Centrifuge model tests are carried out at different soil densities and with different depths of water table. The numerical analyses are performed with an advanced constitutive model for partially saturated soil. The constitutive model is implemented in a finite-element code using the Bishop's effective stress. The model parameters are calibrated based on drained triaxial compression tests on partially saturated soil. The wetting collapse of the tunnel face is simulated by imposing a zero pore pressure condition at the ground surface. The numerical results are compared with the centrifuge tests.

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Section: Constitutive Modelmentioning

confidence: 99%

Face stability of shallow tunnels in partially saturated soil: centrifuge testing and numerical analysis

Soranzo

Tamagnini

2015

Géotechnique

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“…It provides a framework within which accurate models can be developed to describe softening and liquefaction under monotonic and cyclic loading. The basic model has been recently extended by Tamagnini and Pastor 63, Fernández Merodo et al 64 and Manzanal 65, 66 to non‐saturated and collapsible soils.…”

Section: Constitutive Modelling In Geotechnical Engineeringmentioning

confidence: 99%

“…This model was refined by Santagiuliana and Schrefler 73. Both models were able to describe collapse, but presented some limitations that have been addressed by Manzanal 65, 66 and which are described next.…”

Section: Constitutive Modelling In Geotechnical Engineeringmentioning

confidence: 99%

Computational geomechanics: The heritage of Olek Zienkiewicz

Pastor

Chan

Mira

et al. 2011

Numerical Meth Engineering

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SUMMARYGeotechnical engineering design is based on mathematical, constitutive and numerical models implemented in computer codes which are able to predict the behaviour of geostructures and foundations under a wide variety of loading conditions, sometimes demanding or extreme. Prediction is fundamental in areas such as seismic engineering, marine foundations or landslide hazard analysis. No computer code is better than the mathematical, constitutive and numerical models which it implements. This paper is devoted to (i) reviewing the decisive contributions of Professor Olek Zienkiewicz to the development of mathematical, constitutive and numerical models in geotechnical engineering and (ii) presenting some extensions based on his work which have been proposed by the authors. The extensions to be described here are the following: (i) a particularization of the u − p w Zienkiewicz model to the case of fast catastrophic landslides (ii) an extension of the generalized plasticity model proposed by him and (iii) an SPH numerical model for the propagation of fast catastrophic landslides.

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“…Models based on the modified Cam-Clay model (MCCM) have been largely used with fair results, for example [5][6][7][8][9][10][11][12][13][14] . Other approaches have also been used with similar precision, for example hypoplasticity, 15,16 generalized plasticity, 17 hydromechanical energy dissipation, 18 bonding fabric, 19,20 among others. The hydraulic behavior is generally included employing the simple elasto-plastic model proposed by Wheeler et al 21 Others use the van Genuchten 22 or the Fredlund et al 23 equations for single or double structured soils to simulate the main wetting and drying curves.…”

Section: Introductionmentioning

confidence: 99%

A fully coupled simple model for unsaturated soils

Rojas

Horta

Pérez-Rea

et al. 2019

Num Anal Meth Geomechanics

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Summary Different phenomena influence the strength and volumetric behavior of unsaturated soils. Among the most important are suction hardening, hydraulic hysteresis, and the influence of volumetric strain on the soil‐water retention curves. Fully coupled hydro‐mechanical models require including all three phenomena in their constitutive relationships. Among these phenomena, suction hardening is the most influencing as it determines the apparent preconsolidation stress, the position of the loading‐collapse yield surface, and the shift of both the isotropic consolidation and the critical state lines. In this paper, a fully coupled hydro mechanical model is presented. It is based on the modified Cam‐Clay model but includes a yield surface with anisotropic hardening that takes account of the shift of the critical state line with suction. For highly overconsolidated materials, the sub‐loading surface concept has been included in order to increase the precision of the model for these materials. The shift of the retention curves produced by volumetric strains is simulated using a hydraulic model based on the grain and current pore size distribution of the soil.

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Generalized plasticity state parameter‐based model for saturated and unsaturated soils. Part II: Unsaturated soil modeling

Cited by 68 publications

References 41 publications

Face stability of shallow tunnels in partially saturated soil: centrifuge testing and numerical analysis

Face stability of shallow tunnels in partially saturated soil: centrifuge testing and numerical analysis

Computational geomechanics: The heritage of Olek Zienkiewicz

A fully coupled simple model for unsaturated soils

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