Correlating CPTu to G0 in high plasticity paleogene clays
Correlating CPTu to G0 in high plasticity paleogene clays
This paper presents formulations for correlating the cone resistance qc and net corrected cone resistance qnet to the maximum small-strain shear modulus G0 in highly over-consolidated, fissured, marine Paleogene clays of very high plasticity, as observed in the Aarhus area of Denmark. CPTu tests performed in these Paleogene clays reveal fluctuating geotechnical properties both vertically and horizontally. Seismic CPTu tests (SCPTu) are often used to determine stiffness parameters for advanced soil models. However, they are more time-consuming, expensive, and may not always be performed to the required depth. To address this issue, two second-order relationships can be constructed by correlating G0 values derived from SCPTu with corresponding qc and qnet values. Both formulations provide more accurate G0 values than conventional global CPTu correlations and demonstrate that local correlation is always preferable. These formulations make it possible to derive G0 directly from ordinary CPT for use in preliminary analysis of deformations. More importantly, they support the final derivation of G0 for 3D finite element analysis beyond seismic field and laboratory measuring points.
E. Skouboe; K. H. Lundvig; Nik Okkels
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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