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

From National Research Council Canada

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DOI	Resolve DOI: https://doi.org/10.4224/40001222
Author	Search for: Palmer, J. H. L.¹; Search for: Belshaw, D. J.
Affiliation	National Research Council of Canada. NRC Institute for Research in Construction
Format	Text, Article
Conference	TUNNELLING '79, the Second International Symposium, March 12-16, 1979, London, England
Physical description	9 p.
Subject	tunnels; tunnel lining; performance; soft clay; precast concrete
Abstract	A 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	1979
Publisher	National Research Council of Canada. Division of Building Research
Series	Paper (National Research Council of Canada. Division of Building Research), no. DBR-P-864.
Note	Reprint from: Tunnelling '79, London, March 1979, p.3-8
Language	English
Peer reviewed	Yes
NRC number	NRCC 17773 NRC-IRC-2855
NPARC number	20374279
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Record identifier	9f687213-1a61-4ad0-ab43-709bbb4a9720
Record created	2012-07-23
Record modified	2023-01-18

Date modified:: 2024-07-02