On the stress update algorithm of an advanced critical state elasto-plastic model and the effect of yield function equation

Rezania, Mohammad; Sivasithamparam, Nallathamby; Nezhad, Mohaddeseh Mousavi

doi:10.1016/j.finel.2014.06.009

Cited by 12 publications

(5 citation statements)

References 17 publications

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“…The accuracy and reliability of FEM analysis is significantly dependent on the appropriateness of the constitutive model used (e.g., Rezania et al 2014. The Drucker-Prager (D-P) constitutive model with strain softening feature is employed in this work to describe the geomaterial's behavior (Huang et al 2015).…”

Section: Applied Constitutive Modelmentioning

confidence: 99%

Stochastic Assessment of Landslide Influence Zone by Material Point Method and Generalized Geotechnical Random Field Theory

Rezania

Nezhad

2022

Int. J. Geomech.

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In landslide analysis, reliable prediction of landslide's influence zone is significantly difficult due to inherent heterogeneity of soils and their spatially varying geological properties. In this paper, a probabilistic framework is proposed to evaluate the landslide hazard zoning through prediction of their influence zone considering the effects of heterogeneous soil properties. Material point method is used to simulate the large deformations during landslide failure. The spatial variation in the shear strength parameters of soils at undrained conditions is modeled by random fields, which are discretized by Cholesky matrix decomposition method to incorporate the effects of the soil spatial heterogeneity on the post-failure deformations. Furthermore, a practical landslide hazard zoning is conducted to quantitively evaluate the level of disaster for facilities or structures located in the vicinity of the slope by using the exceedance probability of influence distance and runout distance.Five categories based on different thresholds of exceedance probability are used to visualize the area potentially affected by the landslide. To demonstrate the capability of the stochastic

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Section: Applied Constitutive Modelmentioning

confidence: 99%

Stochastic Assessment of Landslide Influence Zone by Material Point Method and Generalized Geotechnical Random Field Theory

Rezania

Nezhad

2022

Int. J. Geomech.

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“…The constitutive models presented above are implemented into ABAQUS finite element software as user-defined material subroutines. The integration of soil models can be conducted by using explicit and implicit schemes, and each of them has its characteristics (Sloan, 1987, Abbo, 1997, Yang et al, 2011, Rezania et al, 2014. For the yield vertex TL model and principal stress RL model, the explicit scheme has been employed throughout to integrate them by the authors, and it proves to be an effective integration scheme (Yang and Yu, 2006, Yang and Yu, 2010, Yang et al, 2011, Yang and Yu, 2013.…”

Section: Numerical Implementationmentioning

confidence: 99%

Comparison of yield-vertex tangential loading and principal stress rotational loading

Yang

2019

Computers and Geotechnics

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“…The advanced models, S-CLAY1S and Creep-SCLAY1S, have been implemented into the finite-element code PLAXIS AE (Brinkgreve et al 2014) through the user-defined soil model facility of the software (Rezania et al 2014). Details of the simulations carried out, and the analysis of the results, in comparison with field measurements, are discussed in the following.…”

Section: Numerical Modeling Of Pvd Improved Groundmentioning

confidence: 99%

Creep analysis of an earth embankment on soft soil deposit with and without PVD improvement

Rezania

Bagheri

Nezhad

et al. 2017

Geotextiles and Geomembranes

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In this paper, an anisotropic creep constitutive model, namely Creep-SCLAY1S is employed to study the installation effects of prefabricated vertical drains (PVDs) on the behavior of a full scale test embankment, namely Haarajoki embankment in Finland. The embankment was constructed on a natural soft soil with PVD installed to improve the drainage under one half of it. The Creep constitutive model used in this study, incorporates the effects of fabric anisotropy, structure and time within a critical state based framework. For comparison, the isotropic modified Cam clay (MCC) model and the rate-independent anisotropic S-CLAY1S model are also used for the analyses. The numerical predictions are compared with field measurements and the results indicate that the creep model provides an improved approximation of field settlements, and excess pore pressure build-up and dissipations. In addition, the application of two commonly used permeability matching techniques for two dimensional (2D) plane-strain analysis of the PVD problem is studied and the results are discussed highlighting their limitations and advantages.

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On the stress update algorithm of an advanced critical state elasto-plastic model and the effect of yield function equation

Cited by 12 publications

References 17 publications

Stochastic Assessment of Landslide Influence Zone by Material Point Method and Generalized Geotechnical Random Field Theory

Stochastic Assessment of Landslide Influence Zone by Material Point Method and Generalized Geotechnical Random Field Theory

Comparison of yield-vertex tangential loading and principal stress rotational loading

Creep analysis of an earth embankment on soft soil deposit with and without PVD improvement

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