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26. Marine soil behaviour classification using piezocone penetration test (CPTu) and borehole records

Author

Yin, K.S., Zhang, L.M., Wang, H.J., Zou, H.F., and Li, J.H.

Subjects
Soils -- Sampling, Earth sciences
Abstract

Several piezocone penetration test (CPTu)-based soil behaviour classification systems (SBCs) have been developed for standard sites, where clays, silt, and sand dominate. However, problems can occur when applying the SBCs to offshore sites, where the marine soils may be decomposed from rocks or mixed with artificial fills. This study evaluates the accuracy of six CPTu-based SBCs for marine soils at a site offshore Hong Kong based on 16 CPTu soundings with 25 367 data points by comparing them with composition-based SBCs from borehole records in the vicinity of each sounding. The soil types are determined from six common CPTu-based SBCs. The interpretation of CPTu data is first performed to generate soil type variables comparable to borehole data, followed by a cross-validation study. The soil classification performance of each SBC is quantified by the weighted kappa coefficient and the Kendall correlation coefficient between the soil types generated by the CPTu-based and composition-based SBCs. The classification accuracy for each soil type is also evaluated via the root mean squared error and the mean absolute error. The classified soil types from the CPTu data are associated with a median degree of consistency, indicating the need for combining CPTu-based and composition-based SBCs for marine soil classification. Key words: cone penetration, soil behaviour, soil classification, borehole, offshore geotechnics. Plusieurs systemes de classification du comportement des sols (SBC) bases sur l'essai de penetration au piezocone (CPTu) ont ete developpes pour des sites standards, ou les argiles, le limon et le sable dominent. Cependant, des problemes peuvent survenir lors de l'application des SBC sur des sites au large des cotes, ou les sols marins peuvent etre decomposes a partir de roches ou melanges a des remblais artificiels. Cette etude evalue la precision de six SBC basees sur le CPTu pour les sols marins sur un site au large de Hong Kong, sur la base de 16 sondages CPTu avec 25 367 points de donnees, en les comparant aux SBC basees sur la composition des enregistrements des trous de forage a proximite de chaque sondage. Les types de sol sont determines a partir de six SBC couramment bases sur le CPTu. L'interpretation des donnees CPTu est d'abord effectuee pour generer des variables de type de sol comparables aux donnees de forage, puis une etude de validation croisee est realisee. La performance de classification des sols de chaque SBC est quantifiee par le coefficient kappa pondere et le coefficient de correlation de Kendall entre les types de sols generes par les SBC bases sur le CPTu et ceux bases sur la composition. La precision de la classification pour chaque type de sol est egalement evaluee via l'erreur quadratique moyenne et l'erreur absolue moyenne. Les types de sol classifies a partir des donnees CPTu sont associes a un degre de coherence median, ce qui indique la necessite de combiner les SBC basees sur le CPTu et sur la composition pour la classification des sols marins. [Traduit par la Redaction] Mots-cles : penetration du cone, comportement des sols, classification des sols, forage, geotechnique extracotiere., Introduction Offshore site investigation is increasingly performed in Hong Kong for land reclamation projects and coastal facilities, where the seabed is formed by very soft marine mud with seashells or [...]

Published
2021
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