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- W65776576 abstract "A multi-laminate constitutive model for soft soils incorporating structural anisotropy is presented. Stress induced anisotropy of strength, which is directly obtained when using multi- laminate type constitutive models for clays, is augmented by directionally distributed overconsolidation. The model is presented in a nonviscous version in order to simulate compressional anisotropy of soft natural soils and destructuration effects. These two important features of the natural soil behaviour are interrelated in the presented model. The performance of the model is shown for some element tests. The effects of the applied directional distribution are shown on a macro level by the resulting shapes of the yield surface on the triaxial plane. The possibilities, limitations and feasible extensions of the proposed model, are discussed. The evidence of anisotropy of soft natural soils has been shown in many high-quality laboratory studies for the stiffness and strength. The anisotropic mechanical characteristics of clayey soils originate from the arrangement of the clay fabric which has arisen during the sedimentation process. This arrangement is highly anisotropic for both natural and reconstituted clays. Most of the differences in the mechanical behaviour of the natural and reconstituted soft soils are related to the existence of inter-particle bonds that were developed during the diagenesis of natural clays. The degree of anisotropy of the small-strain stiffness is of a similar intensity for both natural and reconstituted clays, however, the degree of the strength anisotropy is observed to be higher for natural material. Another important feature in the mechanical behaviour of the naturally bonded soils is a destructuration process, observed during plastic yielding. The destructuration process of a soft soil sample is connected with significant changes of its compressibility and the strength anisotropy. An exemplary experimental evidence is given by Leroueil (1979). The presented version of the model for soft natural clays is developed to realistically model the strength anisotropy and its evolution as well as destructuration effects especially on the so-called wet side of the critical state, where hardening takes place. Recently presented extension to the multi-laminate framework of modelling by Pietruszczak&Pande (2001) is used. It was proposed to model the inherent anisotropy of the strength by introducing the directional dependency of the material parameters. This approach was found to be straightforward and intuitive for the modelling of strength cross-anisotropy and volumetric destructuration of soft clay. Only a few additional parameters to the standard material constants are used for this task. The model is presented in the basic version - open for any extensions." @default.
- W65776576 created "2016-06-24" @default.
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- W65776576 date "2003-01-01" @default.
- W65776576 modified "2023-09-27" @default.
- W65776576 title "Simple multi-laminate model for soft soils incorporating structural anisotropy and destructuration" @default.
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