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

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