1 research outputs found
Distribution of landslides and geotechnical properties within the Hampshire Basin
This paper outlines the sedimentary sequences and geotechnical properties of the Hampshire Basin, a basin of filled with
700 m of Palaeogene clays, silts, sands and limestones in southern England. The paper presents results so far of a
study to synthesize relevant geological and geotechnical data and relate these to the nature of the landslides in this
basin. The study has found that stratigraphic sequences and geotechnical properties vary considerably across the basin
owing to basin morphology and depositional environments which are correspond to complex paleogeography and
tectonic movements during the Tertiary. Over-consolidated clays with low residual shear strengths are extensive on
moderately steep slopes and prone to landsliding, especially on over-steepened coastal sections. Landslides vary from
mudflows through mudslides, rotational landslides and minor falls. Landslide characteristics are strongly influenced by
lithology but gradient appears to be the controlling factor in many cases. The presences of weak strata (clays, lignite,
laminated layers), the pre-existing shear surface, the lithological interface (sand overlying clay) play important roles to
locally control the position of the shear surface and the type of movements. At a basin scale, inland landslides are
associated with the development of drainage system during and since the Tertiary