Geological investigations for the wash water storage scheme / Геологические изыскания для разработки схемы хранения очистных вод

The results of stratigraphical and engineering studies on the Jurassic, Cretaceous and Quaternary sediments of the southern part of The Wash and the adjacent land area are presented. The work was carried out as part of the Wash Water Storage feasibility study and was designed to assess the suitability of these sediments as a tunnelling medium down to depths of 150 m over an area of more than one thousand square kilometres. The stratigraphy of the Oxford Clay, West Walton Beds, Ampthill Clay, Kimmeridge Clay, Lower Cretaceous, Pleistocene and Recent deposits is described. It is suggested that the glacial deposits of Fenland fill a preGlacial valley system.The engineering properties of the various sediments are described and their probable performance in tunnels is discussed in relation to their stratigraphy, chemistry and geological history. Geophysical borehole-logging techniques, particularly total gamma-ray logging, have been extensively used in the work and their usefulness as site investigation tools is discussed. <...>