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Sinking a jacked caisson within the London Basin geological sequence for the Thames water ring main extension

T. G. Newman and H. Y. Wong
Sinking a jacked caisson within the London Basin geological sequence for the Thames water ring main extension
Quarterly Journal of Engineering Geology and Hydrogeology (May 2011) 44 (2): 221-232

Abstract

A tunnel extension to the Thames Water Ring Main has recently been completed in SE London. Two new deep shafts were built at either end, using jacked caisson construction methods. One of the shafts was excavated through much of the London Basin Palaeogene geological sequence and into the Chalk. It is the world's deepest large-diameter jacked caisson. Close geological supervision throughout the construction process validated the pre-construction ground model. This in turn has facilitated predictions of and contingency measures for adverse ground ahead of excavation. Observation and monitoring of the engineering behaviour of each of the stratigraphic units during construction has demonstrated how field data can be gained subsequent to the pre-construction ground investigation. In doing so, construction data have been used to augment and verify the ground investigation borehole and laboratory test data on which shaft design was based, in addition to providing assurances to the on-site construction team on the absence of unforeseen ground conditions.


ISSN: 1470-9236
EISSN: 2041-4803
Serial Title: Quarterly Journal of Engineering Geology and Hydrogeology
Serial Volume: 44
Serial Issue: 2
Title: Sinking a jacked caisson within the London Basin geological sequence for the Thames water ring main extension
Affiliation: Thames Water Utilities, London, United Kingdom
Pages: 221-232
Published: 201105
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 9
Accession Number: 2011-048429
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 3 tables, sketch map
N50°34'60" - N54°40'00", W03°10'00" - E01°45'00"
Secondary Affiliation: Mott MacDonald, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201127
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