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Numerical Modelling of the Time-dependent Behaviour of Venice Lagoon Silts

ABSTRACT: To protect the city of Venice against recurrent flooding, a huge project has been undertaken involving the design and construction of movable gates located at the lagoon inlets for controlling tidal flow. The design of the gate foundations required mineralogic and mechanical characterization of the Venice lagoon soils. An instrumented circular test embankment was constructed in the lagoon area, enabling accurate measurement of relevant ground displacements. Furthermore, in situ stress-strain-time measurements were carried out in order to better understand the viscous behaviour of the material. This paper is aimed to modell ing the creep behaviour shown by field data with finite element analysis, in which a recently developed anisotropic constitutive model was used. The constitutive parameters of the models were calibrated from in situ and laboratory tests on Venetian silty soils. The good performance of the finite element model in predicting time dependent behaviour of Venetian soils is presented.