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Glacigenic soils of the Taff Valley, South Wales: their geomorphology, geology and engineering properties

Abstract The paper identifies the relationships that exist between glacigenic soils at the limits of glaciation, their landforms and engineering properties, using as a type example the predominantly granular soils of the Taff Valley. Local and regional models of glacial and periglacial process Systems derived from engineering geomorphological mapping provide a means for optimizing site investigation design and practice. The models improve efficiency in delineating sample localities, aid the genetic Classification of the soils and assist with the specification of in situ and laboratory testing programmes to ensure maximum cost effectiveness. By the application of Standard geological and geotechnical methods and techniques the soils are shown to exhibit textures, fabrics and ranges of engineering properties developed due to specific modes of genesis and post-depositional history. Consideration is given to dominant modal fractions and to the likely effect these have on the mass behaviour the soils.