Concrete Tunnel Liners:Structural Testing of Cast-In-Place Liners.

摘要

A series of 4tests on circular steel-fiber-reinforced concrete tunnel liners without conventional bar reinforcement is described. The specimens simulate cast-in-place liners made by a slipform system,and were 10ft (3.05 m) OD and had a 6-in. (152mm) uniform thickness. Radial loads were applied with hydraulic rams at 12equally spaced locations around the liner with some rams active and some passive to represent active ground loads above a tunnel and lateral resistance on the sides. Rams that represented the passive soil resistance were given a predetermined load-deflection relationship. Overall deformability,distribution of loads around the specimens and computed internal forces are presented for the tests.