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Engineering geo-hazard challenges for construction upon the Hythe Formation in Kent : Dr Clive Edmonds
March 7 @ 7:30 pm - 9:30 pmFree
Reading Geological Society’s March lecture is open to all and a link can be obtained by registering on our website, www.readinggeology.org.uk on our lectures page using the provided link “Non-members registration”. The Cretaceous aged Hythe Formation comprises interbedded sandstone (hassock) and limestone (ragstone) which forms a relatively narrow arcuate outcrop around the Wealden area. The geological formation is known to display the effects of “cambering” resulting from periglacial weathering conditions which form gulls and fissures. These features are often masked by a superficial cover of head deposits which can form a soil bridge over upward gaping voids associated with the gulls and fissures. The locations of the features can be suddenly revealed by collapse of the soil bridges when they become inundated with water. Case histories from recent years in the Maidstone area will be presented to illustrate the problems that can result when these features are triggered to cause damage to utility services, roads and property. Ground investigation boreholes have also revealed that dissolution of the limestone content can occur adding to the problems. Remedial measures taken to stabilise the ground following collapse will be discussed, together with 3D digital modelling techniques for viewing the ground model and assessing the works done.
Clive is a Senior Consultant at Geotechnics and Geohazards, Stantec (UK) Ltd. and the President of Reading Geological Society.