Long-term performance of a machine-bored tunnel with use of an unreinforced, precast, segmented concrete lining in soft clay

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ConferenceTUNNELLING '79 The Second International Symposium: 12 March 1979, London, England
Pages165171; # of pages: 7
Subjecttunnels; tunnel lining; performance; soft clay; precast concrete
AbstractA tunnel has been constructed in Thunder Bay, Canada, by use of a tunnel boring machine and an unbolted, precast, segmented concrete lining. The lining consists of 2.16-m diameter rings composed of four trapezoidal sections of unreinforced concrete 1 m in length and 11 cm thick. Each ring was assembled within the protection of the tailpiece of the tunnel boring machine. Extensive field instrumentation that provided data on performance during construction was protected after construction so that long-term monitoring could be undertaken. It is expected that observations will be continued for at least five years. The project and the performance of the tunneling system during construction are reviewed, and data from the first two years of observations following the installation of the instruments are presented. During this period a surcharge of about 1 m of soil was added over part of the tunnel alignment, including one of the two instrument arrays.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number17773
NPARC number20374279
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Record identifier9f687213-1a61-4ad0-ab43-709bbb4a9720
Record created2012-07-23
Record modified2016-05-09
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