Structural Behavior of Precast Concrete Tunnel Liners


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Title: Structural Behavior of Precast Concrete Tunnel Liners

Author(s): William L. Gamble

Publication: Journal Proceedings

Volume: 64

Issue: 1

Appears on pages(s): 1-11

Keywords: deflection; liners; precast concrete; subways; testing; tunnels (transportation)

Date: 1/1/1967

Structural tests were conducted on precast concrete segmental tunnel liners considered for use in subway tunnels of the San Francisco Bay Area Rapid Transit District. Each tunnel liner ring consisted of seven segments which formed 30 in. of circular tunnel liner when bolted together. Two liner rings were tested, with loads applied to the outer surface of the rings at 12 points. The behavior of the rings was good. At the maximum load levels attainable, only a small amount of cracking had occurred. The acceptance criterion was that the rings should deflect at least 1 in. without visible damage. Both reached 2.5 in. deflection without appreciable damage.