Viscoplastic cyclic degradation model for soft natural soils

Projekt:

Quantifying complex track stiffness response

Sammanfattning:
Cyclic loading affects the long-term response of geostructures build on natural soils. Soft soils are particularly
susceptible to the development of large deformations, induced by the repetitive nature of loading. A new viscoplastic cyclic accumulation model is presented, which is an hierarchical extension of the Creep-SClay1S model,
to model the long-term permanent deformation resulting from undrained cyclic loading of natural soft clays. The
cyclic cumulative strains are incorporated by means of an additional viscoplastic multiplier. This cyclic viscoplastic multiplier adds four additional model parameters that are derived from undrained cyclic triaxial tests. The
model is calibrated using experimental data from undrained cyclic triaxial tests performed on high quality block
samples of natural Onsøy clay, at different average shear stresses, shear stress amplitudes and loading periods.
The accuracy of the proposed model is demonstrated by comparing the element level simulations with the
experimental data. The applicability of the proposed model is further illustrated with a boundary value problem,
where an embankment submitted to cyclic loading is simulated. The use of the new model enables the simulation
of the response of cyclic loaded foundations on soft soils, where the serviceability limit state over a long period of
time is governing the design.

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Författare: Coelho et al
Utgivare: Elsevier
Utgivningsdatum: 2021-11-30
Diarienummer: TRV 2016/106277
Antal sidor: 12
Språk: Engelska
Kontaktperson: Johan Jonsson, IVta2