Abstract
A comprehensive regional geological and geotechnical survey of an area of about 450 sq. km between the Rivers Crouch and Roach in South Essex has been carried out for the Department of the Environment to guide planners in the then proposed urban and industrial development to accompany construction of a third London airport at Maplin. Geological mapping, borehole, pit, trench, core penetrometer and geophysical investgations in the field were supported by laboratory studies of the mineralogy, micropalaeontology and geotechnical characteristics of the superficial, drift and Tertiary deposits of the area. These studies enable geotechnical groups and units to be identified and various presentations of the three dimensional engineering geology, principally in maps and sections at 1∶15,000 scale, have been produced, both manually and by computer. The potential engineering problems are associated with landslips in London Clay, variable thicknesses and character of Alluvium and metastability of loessic “Brickearth”. An engineering planning map divides the area into zones of engineering significance.
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