Effect of dilatancy on the strain localization of water-saturated elasto-viscoplastic soil

Oka, Fusao; Higo, Yosuke; Kimoto, Sayuri

doi:10.1016/s0020-7683(02)00171-3

Cited by 44 publications

(20 citation statements)

References 22 publications

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“…The method was originally developed to solve the strain localization problem of clays under plane strain conditions by Oka et al [27], Kimoto et al [29], Higo [30], and Higo et al [31]. In order to investigate the strain localization of clay under true three-dimensional conditions, the analysis method was expanded to the three-dimensional field by Higo [30] and Higo et al [33].…”

Section: Three-dimensional Coupled Fluid-structure Finite Element Anamentioning

confidence: 99%

Effects of sample shape on the strain localization of water‐saturated clay

Kodaka

Higo

Kimoto

et al. 2007

Num Anal Meth Geomechanics

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SUMMARYStrain localization is an important geotechnical problem related to large deformations and the onset of failure, such as slope failure. It is necessary, therefore, to clarify the mechanisms of the strain localization of geomaterials in order to predict large deformations of the ground. For the last two decades, many researchers have studied the strain localization of geomaterials through both experimental and numerical works. Most of the works, however, particularly the numerical studies, have been treated as two-dimensional plane strain problems for the sake of simplicity, even though the actual phenomena are generally three dimensional.In order to understand the deformation, the failure, and the strain localization of clay under threedimensional conditions, triaxial tests on clay and their numerical simulation are performed in the present study. In particular, focus is mainly placed on the effects of sample shape on the localization behaviour of normally consolidated and overconsolidated clays. A series of undrained triaxial compression tests, using rectangular clay specimens with different shapes and strain rates, is conducted. Localized shear strain distributions are successfully observed with an image analysis of digital photographs. It is seen that the shape of a specimen affects the various bifurcation phenomena of clay, e.g. the formation and the progress of various three-dimensional shear bands, failure with buckling, etc. The numerical simulation using the finite element method, with an elasto-viscoplastic model and considering structural changes, can reproduce the generation and the growing process of shear bands well. A comparison between the results of the experiment and the simulation offers new findings regarding the strain localization of clay under threedimensional conditions.

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Section: Three-dimensional Coupled Fluid-structure Finite Element Anamentioning

confidence: 99%

Effects of sample shape on the strain localization of water‐saturated clay

Kodaka

Higo

Kimoto

et al. 2007

Num Anal Meth Geomechanics

Self Cite

View full text Add to dashboard Cite

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“…The shear band phenomenon in granular materials has been studied extensively (Roscoe, 1970;Zbib and Aifantis, 1989;de Borst and Muhlhaus, 1992;Vardoulakis, 1996;Oda et al, 1998;Oka et al, 2002;Gajo et al, 2004;Al Hattamleh et al, 2004;Liu et al, 2005). Some of these studies have introduced different higher gradient measures to incorporate microstructure length scale into the classical formulations to model strain localization and shear bands.…”

Section: Introductionmentioning

confidence: 99%

Multi-slip gradient formulation for modeling microstructure effects on shear bands in granular materials

Hattamleh

Muhunthan

Zbib

2007

International Journal of Solids and Structures

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This paper presents a higher order gradient multi-slip formulation to model the effect of inhomogeneous deformation in granular materials. The effects of heterogeneity and porosity anisotropy within the multi-slip formulation are taken into consideration through the modification of the mobilized friction. The mobilized friction is assumed to be a direct function of either the gradient of the porosity distribution or the fabric tensor. The formulation with two active slip planes was implemented into a finite element code and used to simulate biaxial shear tests on dry sand. The analysis quantifies most of the shear band characteristics observed by past experimentation. It is shown that the localization and shear band characteristics in granular materials are very much dependent on the initial fabric and slip system arrangement.

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“…It is known that most of the work on non-associated rule has considered the dilatancy angle, E of 0°. However, some work has been done on the effects of soil dilatancy (Oka et al 2002, Su et al 2010. It is well known that cohesion and friction have the largest impact on the stability of slopes compared to other parameters used for Elasto-plastic modelling.…”

Section: Materials Dilationmentioning

confidence: 99%

3-D elasto-plastic spectral element application to evaluate the stability of large-scale landslides

Tiwari

Bhandary

Yatabe

2015

Geomechanics and Geoengineering

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This research deals with the computational accuracy impact factors of elasto-plastic spectral element applications to slope stability. It contains three categories of impact factors: 1) modelling domain related parameters, 2) spectral parameters, and 3)X elasto-plastic parameters. Each category has many accuracy impact factors. The modelling domain and elasto-plastic related impact factors can be equally applied to the elasto-plastic finite element method, however spectral corrections can only be applied for spectral element applications. This work presents a numerical evaluation of all three impact factors to the stability factor of a slope in three representative theoretical domains of slope angle, β; of 26.26°, 36.69°, and 45°. In addition, the study focuses on spectral element applications to slope stability evaluation, because it is a new and reliable approach in slope stability modelling. It has several benefits over the existing modelling methods to apply for slope stability modelling: 1) geometric flexibility of the finite elements, 2) high computational efficiency, 3) reliable spectral accuracy, and 4) high numerical stability.

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Effect of dilatancy on the strain localization of water-saturated elasto-viscoplastic soil

Cited by 44 publications

References 22 publications

Effects of sample shape on the strain localization of water‐saturated clay

Effects of sample shape on the strain localization of water‐saturated clay

Multi-slip gradient formulation for modeling microstructure effects on shear bands in granular materials

3-D elasto-plastic spectral element application to evaluate the stability of large-scale landslides

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