Formulation and implementation of a practical multi-surface soil plasticity model. (January 2020)

• Record Type: Journal Article
• Authors: Whyte, S.A.; Burd, H.J.; Martin, C.M.; Rattley, M.J.
• Is Part Of: Computers and geotechnics. Volume 117(2020)
• Publication Date: 2020-01
• Subjects: Undrained clay -- Monopile -- Offshore foundation -- Cyclic loading -- Constitutive model -- Parallel Iwan model; Engineering geology -- Data processing -- Periodicals; Soil mechanics -- Data processing -- Periodicals; Rock mechanics -- Data processing -- Periodicals; 624.1510285
• DOI: 10.1016/j.compgeo.2019.05.007
• Languages: English
• ISSNs: 0266-352X

Abstract

Abstract: This paper presents a new constitutive model for clay, for undrained monotonic and cyclic loading, that has been developed specifically for geotechnical design applications. The model employs a parallel Iwan approach, consisting of multiple elastic-perfectly-plastic micro models. Degradation of stiffness and strength during cyclic loading is incorporated using an empirical cyclic overlay method. The theoretical framework and calibration processes for the model are presented. An implementation of the model in a commercial finite element program is then described; this implementation is demonstrated via 3D finite element analyses of example offshore monopile foundations subjected to monotonic and cyclic lateral loading.