BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:The performance of circular shafts and ground movements due to con
 struction - centrifuge testing and field observations. - Njemile Faustin (
 University of Cambridge)
DTSTART:20170511T150000Z
DTEND:20170511T154500Z
UID:TALK72505@talks.cam.ac.uk
CONTACT:Magdalena Charytoniuk
DESCRIPTION:Circular shafts are an integral component of tunnelling projec
 ts. However\, there are few well-documented case studies of circular shaft
 s which make it difficult to accurately predict their performance or estim
 ate the magnitude and extent of surrounding ground movement. A cautious ap
 proach often adopted by designers can have significant impact on the shaft
  construction costs and the protective measures implemented for nearby bui
 ldings and services.   \n\nField observations of circular shaft constructi
 on  were assembled from three major tunnelling projects in London. The sha
 fts had a range of geometries and construction methods. In addition\, well
 -controlled centrifuge model tests were conducted of circular shaft excava
 tion. New apparatus and new centrifuge testing procedures were developed t
 o extract small quantities of soil from the centre of the shaft in-flight.
  The centrifuge model was well-instrumented to monitor bending and hoop st
 rains in the shaft lining and adjacent ground surface movements during exc
 avation.\n\nThis presentation describes the new apparatus and the  behavio
 ur of circular shafts and the adjacent ground based on a comprehensive rev
 iew of the field observations and centrifuge test results.
LOCATION: Cambridge University Engineering Department\, Lecture Room 6
END:VEVENT
END:VCALENDAR