ABSTRACT
This paper provides a practical formulation for correlating net-corrected cone resistance qnet to the drained unloading and reloading stiffness Eur in highly overconsolidated, fissured, marine Paleogene clays of very high plasticity as observed in Aarhus, Denmark. Eur is used for analysis of soil deformations using Hardening Soil models, which is particularly advantageous to use rather than more traditional Mohr-Coulomb soil models when the soil model has to handle both loading and unloading. By correlating Eur from 34 drained triaxial tests to qnet from CPTu’s near the boreholes from which the triaxial-samples are extracted, a linear correlation between these two properties is found. This formulation makes it possible to derive Eur directly from CPTu for use in preliminary analysis of deformations. More importantly, the correlation supports the final derivation of Eur for 3D finite element models once the results of all field and laboratory tests for the construction project are available.
