Construction in urban areas and the development of improved transportation links increasingly involves building works on soft clay deposits, which occur widely throughout Europe and elsewhere in the world. To improve the current design methods, which can be either over-conservative or unsafe, improved understanding of soft clay behaviour and constitutive modelling is required, together with implementation in numerical codes that are suitable for widespread use by practising geotechnical engineers. The research activities concentrate on the further development and validation of a constitutive model for soils based on the multilaminate framework. The elasto-plastic constitutive formulation, called ‘Multilaminate Model for Clay’ (Wiltafsky, 2003) incorporates effects of anisotropy and principal stress rotation by evaluating the response from various independent acting contact planes. Within the next development stages strain softening and the consideration of small strain stiffness will be enclosed in the formulation. For solving practical problems such as embankments, foundations, tunnels, excavations and ground improvement techniques the model is already available in the commercial finite element code Plaxis Version 8 as user-defined soil model.
|Effective start/end date||1/01/00 → 31/01/08|