The Spatial Variability of the cone tip resistance of Weathered Mudstone Profiles from CPT testing

Yuderka Trinidad Gonzalez, Kevin Briggs, William Powrie, Nick Sartain, Simon Butler

Research output: Contribution to conferencePaperpeer-review

Abstract

Cone penetration test (CPT) data were used to explore the vertical spatial variability in weathered layers of the Charmouth Mudstone Formation (Lias Group) at a site in Oxfordshire, England. The Charmouth Mudstone Formation is a stiff, fissured Jurassic mudstone that was formed 183-199 million years ago and weathered by glacial and periglacial conditions during the past 200,000 years. Forty-six CPT profiles were considered in the variability assessment. The vertical variability of the cone tip resistance was characterized by determining the vertical scale of fluctuation analyzed within a homogenous layer via the random field theory. The results showed that the profiles of weathered mudstone had a low scale of fluctuation, which translates to high variability among the property values. The vertical scale of fluctuation of qc for the weathered mudstone profiles varied between 0.10 m and 0.69 m, with an estimated theoretical average of 0.30 m and a coefficient of variation equal to 42%. A probability histogram of the vertical scale of fluctuation of qc showed higher probability of occurrence between 0.11m and 0.49m. The vertical scale of fluctuation qc did not show a distinction between the weathered mudstone layers and the underlying, unweathered material.
Original languageEnglish
Publication statusPublished - 31 Dec 2022
EventThe 8th International Symposium on Geotechnical Safety and Risk (ISGSR 2022) - Newcastle, Australia, Newcastle, Australia
Duration: 14 Dec 202216 Dec 2022
https://isgsr2022.org/

Conference

ConferenceThe 8th International Symposium on Geotechnical Safety and Risk (ISGSR 2022)
Country/TerritoryAustralia
CityNewcastle
Period14/12/2216/12/22
Internet address

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