The Kimmeridge Clay and Corallian limestone that underpin much of Swindon create a deceptive stability. Just below the surface, pockets of saturated alluvial sands and silts along the River Ray and its tributaries can liquefy under seismic loading, even at the low-to-moderate magnitudes we see in the UK. Most engineers overlook this because Britain isn't California, but the seismic hazard maps for the Cotswold fringe tell a different story. Our soil liquefaction analysis maps the cyclic resistance ratio against the design earthquake, giving your structural team a clear yes-or-no on whether ground improvement is needed before the first pile goes in. We've run these assessments on brownfield plots near the railway works and greenfield expansions toward Wichelstowe, where the water table sits barely two metres down.
A site classified as 'non-liquefiable' on a desk study can still fail the cyclic stress ratio check once we pull the first Shelby tube.
