Spatial variability of London Clay using CPT and SPT data

Huang Wengui, Tom Dijkstra, Fleur Loveridge, Paul Hughes, Anthony P. Blake, Marcus Dobbs, Yuderka Trinidad Gonzalez

Research output: Chapter in Book/Report/Conference proceedingConference contribution


London Clay has been the subject of intensive investigations, but further research is required to characterize the spatial variability in greater detail. This study focuses on establishing a measure of the spatial variability using the Scale of Fluctuation (SoF), a key input into random field modelling of geotechnical problems. At two sites in Central London, the SoF is calculated using cone penetration tests (CPT) and standard penetration tests (SPT), both driven perpendicular to the lithostratigraphic sequence. The vertical interval (spacing) of CPT data is 0.02 m. The spacing of SPT data is ≥ 1.5 m. The results show that the vertical SoF from CPT is 0.24 - 1.01 m with a mean of 0.48 m; the vertical SoF from SPT is 0.96 - 3.99 m with a mean of 2.26 m. The SoF from SPT is close to the SPT data spacing, therefore the accuracy of SoF from SPT is questionable. The results also suggest that the main drivers for spatial variability are likely attributed to sedimentary cycles acting over thousands of years. The results do not provide sufficient resolution to evidence any seasonal variations.
Original languageEnglish
Title of host publicationProceedings of the 8th International Symposium on Geotechnical Safety and Risk (ISGSR)
EditorsJinsong Huang, D. V. Griffiths, Shui-Hua Jiang, Anna Giacomini, Richard Kelly
PublisherResearch Publishing
ISBN (Electronic)9789811851827
Publication statusPublished - 14 Dec 2022
Event8th International Symposium on Geotechnical Safety and Risk - Newcastle, Australia
Duration: 14 Dec 202216 Dec 2022


Conference8th International Symposium on Geotechnical Safety and Risk
Abbreviated titleISGSR
Internet address


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