Calibration of constitutive models for finite element analyses of embankments on peat
Calibration of constitutive models for finite element analyses of embankments on peat
Part of the Finnish railway network is built on soft organic soil, including peat. Geotechnical design in peat presents challenges when evaluating stability and deformations under increased traffic loads or when a railway or road expansion is planned. The evaluation of shear strength of peat is not straightforward. Moreover, peat generally shows high compressibility and thus deformations shall be also evaluated along with shear mobilization under embankments. This can be done utilizing finite element analyses. In Finland, Field Vane test is generally used to evaluate undrained shear strength, which does not provide information of soil stiffness. This study focuses on the calibration of peat model parameters for some of the most used FE soil models, including Mohr-Coulomb, Hardening Soil and NGI-ADP constitutive models in PLAXIS. Data from a railway site in Northern Finland was used for the calibration. The data consists of undrained triaxial compression and direct simple shear tests. The calibration parameters are meant to be used in preliminary undrained stability and serviceability calculations of embankments on Finnish peat.
Marco D'Ignazio; Santeri Sainio; T. Laensivaara; Harun K. Engin
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
7. Dams, embankments and slopes
https://doi.org/10.53243/NUMGE2023-85
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