A hypoplastic model for clay and sand |
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| Authors: | T Weifner D Kolymbas |
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| Institution: | (1) Unit of Geotechnical and Tunnel Engineering, Institute of Infrastructure, Technikerstr. 13, 6020 Innsbruck, Austria |
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| Abstract: | The theory of hypoplasticity was developed initially for non-cohesive soils. However, sand and clay have many common properties;
therefore arose the idea to extend the hypoplastic model to clay. The proposed model is able to describe the behaviour of
cohesive soils with the incorporation of an appropriate structure tensor into the constitutive equation. This tensor is a
stress-like internal parameter, also called back stress. This enables us to describe the behaviour of cohesive soils with
the same material parameters for several states of consolidation and also to model barotropy and pycnotropy of sand. Numerical
simulations of element tests are performed in order to check the performance of this hypoplastic model. Experimental data
obtained with normally and overconsolidated clay and sand specimens with various densities are taken for comparison, and it
is shown that the model is capable of describing the material behaviour of clay and sand. The determination of the material
constants, the calibration method, is also presented in this paper. |
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