Review of SPT-undrained shear strength correlation for UK soil deposits
Review of SPT-undrained shear strength correlation for UK soil deposits
The Standard Penetration Test (SPT) is a ubiquitous test undertaken during ground investigations in the UK (and worldwide). In UK geotechnical practice the Stroud relationship is often used to estimate undrained shear strength using the plasticity index and the SPT blow count. Increasingly geotechnical engineering is adapting to the presence of open-data which can be used to re-evaluate and update design rules. This paper makes use of data from various literature sources and data obtained from archived AGS files, which store digital ground investigation information in an industry standard format. AGS files were obtained from the British Geological Survey’s (BGS) National Geoscience Data Centre (NGDC) to compare test results with the original Stroud relationship. This work quantifies the potential parameter variation that may be encountered when estimating undrained shear strength using the SPT across six geological deposits. This allows for improved risk mitigation during the design process and, while the existing relationship remains in line with the new results, this highlights the possibility of material specific correlations.
Jamie J. Crispin; Charlotte Elizabeth L. Gilder; Paul Joseph Vardanega
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
C - Risk analysis and safety evaluation
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