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The influence of late and post glacial slope development on the engineering geology of Wenlock Shale near Ironbridge, Salop

Abstract A section of the road route chosen for the Ironbridge bypass crosses the northern valley slopes of the River Severn, near Buildwas, Salop. The slopes are underlain by Silurian Wenlock Shale which have been affected by slope degradation dating from the end of the last (Devensian) glaciation. The road design included cuttings and a large embankment up to 20 m high and circa 300 m long which was constructed across landslipped ground. This paper describes the engineering geology of the shale and the slopes, and draws particular attention to the difficulties of selecting critical potential failure mechanisms where there are complex, periglacially disturbed ground conditions.