Evaluation of existing CPTu-based correlations for the deformation properties of Finnish soft clays

An extensive research program for soil testing has been conducted on five soft clay deposits located in Finland. This research project aims to collect data from high quality in-situ and laboratory tests and derive correlations for the strength and deformation properties specific to Finnish clays. In the literature, several authors have proposed correlation models for the deformation properties of soft clays based on CPTu measurements. However, such models are often calibrated for a specific site or a specific soil type. Consequently, these models must be validated before applying them to different soil conditions. In this paper, existing correlations for the deformation properties of soft clays based on CPTu data are compared to the test results from the investigated sites. The validity of the existing models is assessed for Finnish clays by evaluating their bias and uncertainties.