The influence of weathering on index properties and undrained shear strength for the Charmouth Mudstone Formation of the Lias Group at a site near Banbury, Oxfordshire, UK

Kevin Briggs, Letisha Blackmore, Fleur Loveridge, Aleksandra Svalova, Stephanie Glendinning, William Powrie, Simon Butler, Nick Sartain

Research output: Contribution to journalArticlepeer-review

Abstract

The Lias outcrop extends continuously from Dorset to Yorkshire in England, with outlying areas in Somerset and Wales. It underlies the transport routes between a number of major UK cities. Understanding the material properties of the Lias Group is therefore important for infrastructure construction and maintenance across England and Wales.
This study examines the influence of weathering on the engineering properties of the Charmouth Mudstone Formation (Lias Group) in the light of recent developments in ground investigation practice including (i) the use of modern visual weathering classifications for soils and rocks and (ii) the availability of large ground investigation datasets from the construction of the High Speed Two (HS2) railway.
The variability in the undrained shear strength data was consistent with the moisture content, liquidity index and plasticity index of the samples, but they were poorer indicators than shown in previous studies. The visually-assessed weathering class and the depth below ground level were found to be more useful indicators of the undrained shear strength of the clay and mudstone samples of the Charmouth Mudstone Formation.
Original languageEnglish
Article numberqjegh2021-066
JournalQuarterly Journal of Engineering Geology and Hydrogeology
Volume55
Issue number3
Early online date24 Feb 2022
DOIs
Publication statusPublished - 16 Mar 2022

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