Calculation of deformations of an underwater excavation using parameters of Berlin sand from a hypoplastic model
✍ Scribed by Ivo Herle; Peter-Michael Mayer
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- German
- Weight
- 656 KB
- Volume
- 86
- Category
- Article
- ISSN
- 0932-8351
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✦ Synopsis
Abstract
Soil parameters are always related to particular constitutive laws. For the application of elastic‐perfectly plastic constitutive models in commercial FE codes, it is necessary to determine a large number of parameters because soil stiffness and friction angle are pressure‐ and density‐dependent. On the contrary, the hypoplastic model includes only pressure‐ and density‐independent constants which are closely related to the properties of grain assemblies. The determination of hypoplastic parameters is demonstrated for Berlin sand, and it is shown how conventional stiffness and strength quantities can be calculated using hypoplasticity. Afterwards, a FE calculation of an anchored wall in Berlin is performed with the Mohr‐Coulomb constitutive law and soil parameters from the hypoplastic model. Results of the calculation coincide well with the measured values. Nevertheless, limitations of such a procedure are pointed out and the need for more comprehensive constitutive laws in complex boundary value problems is emphasized.