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K. Hashiguchi
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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TIME-DEPENDENT ELASTOPLASTIC CONSTITUTIVE EQUATION OF SOILS AND ITS APPLICATION TO FEM IMPLEMENTATION T. Okayasu; K. Hashiguchi
Lowland Technology International Vol 3 No 2, Dec (2001)
Publisher : International Association of Lowland Technology

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Abstract

The time-dependent subloading surface model (Hashiguchi and Okayasu 2000) would predict time-dependent elastoplastic deformation of materials pertinently. In this article the equation of the creep stretching formulated in the previous article for soils is extended so as to predict the time-dependent deformation of soils more accurately. Its adequacy is evaluated by comparisons with test data under undrained triaxial compression. Further, the finite element method (FEM) program for the prediction of time-dependent elastoplastic deformation behavior of soil structures is developed based on the time-dependent subloading surface model, the soil-water coupled formulation and the finite deformation theory. The ability of the FEM program is examined for the simulation of one-dimensional consolidation phenomenon.
PREDICTION OF THE DEFORMATION BEHAVIOR OF SAND SUBJECTED TO GENERAL CYCLIC LOADING BY THE TANGENTIAL-SUBLOADING SURFACE MODEL H. Setouchi; K. Hashiguchi; M. Ueno
Lowland Technology International Vol 7 No 1, June (2005)
Publisher : International Association of Lowland Technology

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Abstract

The traditional elastoplastic constitutive equations can not generally describe the inelastic deformation considering the magnitude and the direction of the stress rate. Therefore, the stiffness is unrealistically predicted in thenonproportional loading. The tangential-subloading surface model by Hashiguchi and Tsutsumi (2001) can describe the dependence of both the magnitude and the direction of the inelastic strain rate on the stress rate. In this paper, the tangential strain rate induced by the stress rate component tangential to the yield surface is incorporated into the extended subloading surface model to describe the cyclic loading behavior. The model is applied to the prediction of the deformation behavior of sand subjected to general cyclic loading including the proportional and nonproportional loadings. The validity of the model is verified by comparing with experimental results.
DEFORMATION BEHAVIOR OF SHIRASU SOIL BY THE EXTENDED SUBLOADING SURFACE MODEL M. Hira; K. Hashiguchi; M. Ueno; T. Okayasu
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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This study is aimed at evaluation of the deformation behavior of Shirasu soil (volcanic sandy soil) for reclamation and embankment construction, using elastoplastic constitutive equation based on the subloading surface model with the rotational hardening. Test results for isotropic consolidation and monotonic/cyclic loading-unloading compression with several lateral stresses under the drained conditions for various initial void ratios are reported. Further, the simulation by the constitutive equation based on the extended subloading surface model is compared with the test results. High applicability of the constitutive equation for the prediction of mechanical behavior of Shirasu soil for a geo-material at the lowland in the southern Kyushu is verified by the comparison.
Co-Authors H. Setouchi M. Hira M. Ueno T. Okayasu