Strain localisation modelling and pore pressure in saturated sand samples |
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Authors: | B A Schrefler H W Zhang M Pastor O C Zienkiewicz |
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Affiliation: | (1) Department of Constructions and Transportation, University of Padua, via Marzolo 9, 35131 Padova, Italy, IT;(2) Research Institute of Engineering Mechanics, Dalian University of Technology, Dalian 116024, P. R. China, CN;(3) CETA, Cedex Alfonso XII 3, 28014 Madrid, Spain, ES;(4) Institute of Numerical Methods in Engineering, University of Wales, Swansea, U.K., GB |
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Abstract: | Dynamic strain localisation theory together with a multiphase material model is used to simulate shear band dominated processes
in fully saturated sand samples. The fluid-saturated medium is viewed as multi-phase continuum consisting of a solid skeleton
and pores filled by fluids. The governing equations are based on the general framework of averaging theories. A generalised
plasticity constitutive model for fully saturated soils is adopted in the computational process. Both samples of medium-loose
and dense sands are studied. Negative water pressures, which are important in localisation phenomena of fully saturated dilatant
geomaterials, are obtained for dense sands, while positive water pressures result for medium-loose sands. |
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