A two-dimensional effective stress framework for modelling 'whole-life' soil strength changes
A two-dimensional effective stress framework for modelling 'whole-life' soil strength changes
The undrained shear strength of fine-grained soils changes with time, reducing due to pore pressure generation, and increasing during consolidation. This paper describes an effective stress framework, implemented within a two-dimensional computational domain, that relates generation of pore pressure to accumulated plastic shear strain, allowing undrained shear strength to be calculated within the context of critical-state soil mechanics. The magnitude and distribution of plastic shear strain around objects buried in soil is determined through a series of large deformation finite element analyses, and these spatial distributions are described using a strain influence function in the framework to calculate the extent and magnitude of excess pore pressure, and in turn the mobilised soil strength around the buried object. The potential of the framework is examined through a series of example simulations that demonstrate the changing soil strength that would be mobilised by an embedded foundation in response to varying loading histories.
Conleth O'loughlin; Yufei Wang; Z. Zhou; Christophe Gaudin
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
3. Coupled analysis
https://doi.org/10.53243/NUMGE2023-359
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