Plasticity Approach to Sand Behaviour under Principal Stress Axes Rotation

Towhata, Ikuo; Pradel, Daniel; Ishihara, Kenji

doi:10.1016/b978-0-444-70523-5.50029-1

Cited by 18 publications

(32 citation statements)

References 6 publications

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“…The model can reproduce the effect of the rotation of principal stress axes because the stress path associated with the rotation of principal stress axes can cause loading of some mechanisms while unloading of others [1,4]. The model can readily distinguish the inherent anisotropy from the induced anisotropy as described later.…”

Section: Introductionmentioning

confidence: 98%

“…Among various constitutive models proposed for granular materials, a model that characterizes a structure of the assemblage of particles has capability to reproduce the distinctive behaviour of granular materials due to that structure. A promising example is a strain space multiple mechanism model [1][2][3] among others. The model consists of a multitude of simple shear mechanisms with each simple shear plane oriented in an arbitrary direction.…”

Section: Introductionmentioning

confidence: 99%

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Yield and cyclic behaviour of a strain space multiple mechanism model for granular materials

Iai

Ozutsumi

2005

Int. J. Numer. Anal. Meth. Geomech.

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SUMMARYThis paper reviews fundamental behaviour of a strain space multiple mechanism model for granular materials. Although this model has previously been implemented in a finite element program and used in the analysis of numerous practical problems for evaluating seismic performance of geotechnical works, most of the application was limited to the two dimensional boundary value problems. This paper reviews the theoretical link between the micromechanical and macroscopic behaviour of granular materials and discusses the relationship between the two and three dimensional behaviour of the model. The strain space multiple mechanism model characterizes a twofold structure of an assemblage of particles: the first is a multitude of virtual two dimensional mechanisms, the second a multitude of virtual simple shear mechanisms of one dimensional nature. Due to the twofold structure, a yield criterion specified in the micromechanical level does not reproduce the same yield criterion at the macroscopic level. There is an effect of the intermediate principal stress. Based on this finding, the paper proposes a methodology to introduce various macroscopic yield criteria, including Tresca, von Mises, extended Tresca, DruckerPrager, Mohr-Coulomb, and extended Mohr-Coulomb criteria within the framework of the strain space multiple mechanism model. Performance of this model incorporating various yield criteria is demonstrated for monotonic and cyclic loading, under drained and undrained conditions.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Yield and cyclic behaviour of a strain space multiple mechanism model for granular materials

Iai

Ozutsumi

2005

Int. J. Numer. Anal. Meth. Geomech.

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“…Here, the multi-yield surface plasticity concept (Towhata et al 1985;Towhata 2008) is applied to formulate the shear stress-shear strain relation of the soil which may follow hysteresis Masing's rule (1926) for example. The basic idea of this integral scheme is actualized to sum up component stresses that may represent microscopic events of particles' mechanics.…”

Section: Appendixmentioning

confidence: 99%

Global and Local Impacts of Soil Confinement on RC Pile Nonlinearity

Mohammed

Maekawa

2012

ACT

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Greater confinement of the soil foundation may globally reduce the shear span length, which may raise the risk of shear failure of RC piles. On the other hand, soil confinement may improve the flexural ductility of the pile section locally. This study discusses these global and local impacts of soil confinement on the RC-pile mechanistic behaviors, experimentally and analytically. Small-scale mortar-based piles were newly produced as a mockup of real-scale reinforced concrete so as to obtain the consistent nominal shear strength by reducing the shear transfer along cracks to overcome the size effect. Then, the global impact of soil confinement on pile shear failure is reproduced inside the small-scale experimental devices with soil. The soil-pile interaction test also shows the local impact of soil confinement in terms of increasing the flexural ductility of the miniature pile section by suppressing cover spalling and local buckling of reinforcement. It is confirmed that the coupled local and global effects of soil confinement can be consistently taken into account in 3D computational simulation without reducing the degree of freedom for strain fields.

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“…Here, the multi-yield surface plasticity concept (Towhata and Ishihara 1985;Towhata 2008;Maekawa et al 2003) is applied to formulate the shear stress -shear strain relation of the soil following Masing's rule (1926).…”

Section: Constitutive Model For Soilmentioning

confidence: 99%

Nonlinear Seismic Response and Damage of Reinforced Concrete Ducts in Liquefiable Soils

Okhovat

Feng

Maekawa

2009

ACT

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Highly inelastic nonlinear interaction of liquefied soil and underground RC ducts is computationally investigated in view of the structural damage. The required ductility is expected to be insensitive to the risk of liquefaction for normally deposited layers of soil, and the lesser ductility is acceptable for the case of highly liquefiable foundation similar to the seismic isolation. Although the structural nonlinearity has a fewer effect on the uplift of the underground ducts, the amount of main reinforcement may control the structural damage with the same efficiency for both drained and undrained soil deposits.

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Plasticity Approach to Sand Behaviour under Principal Stress Axes Rotation

Cited by 18 publications

References 6 publications

Yield and cyclic behaviour of a strain space multiple mechanism model for granular materials

Yield and cyclic behaviour of a strain space multiple mechanism model for granular materials

Global and Local Impacts of Soil Confinement on RC Pile Nonlinearity

Nonlinear Seismic Response and Damage of Reinforced Concrete Ducts in Liquefiable Soils

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