Abstract
The construction of the A21 Sevenoaks Bypass in Kent is a seminal case study in engineering geology. In 1965 during the earthworks for the road, major slope failures occurred presenting a significant setback to the programme. No slope stability issues were foreseen before the groundworks commenced. Post failure forensic investigations revealed multiple shear surfaces within lobe-like landforms that dissected the original route alignment. At that time, these landforms were not recognised, and their problematic nature not fully understood. Similarly, the Maidstone district has long been described as an area of relict periglacial landforms, specifically cambering and associated gulls, and valley bulge. This paper presents key case studies, which detail the nature of the relict periglacial landsystem that gave rise to the encountered geohazards and demonstrates the advances in ground model assessment offered by airborne LiDAR (laser scanning) data sets for engineering geomorphology. High resolution digital elevation models derived from the LiDAR imagery (that became available for the first time in 2019) can be utilised to interpret and visualise the on-ground geomorphology. The available LiDAR imagery is described, and examples of their use presented from these classic case study sites.
Published Version
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