Concrete Tunnel Liners:Structural Testing of Segmented Liners.

摘要

Tests of three circular segmented steel-fiber-reinforced concrete tunnel liners are described. They were 10ft outside diameter and loaded with hydraulic rams in a manner that approximates a ground loading. There were six segments and a key in each ring and the segments were ribbed to allow bolting them together. Two tests were on single rings of segments and the third was on 3rings bolted together. A series of beams that were designed to fail in shear and made of steel-fiber-reinforced concrete were tested. The results are used to develop a means for predicting shear strength of liner segments subjected to moment and thrust as well as shear. Segment joints similar to those used in the liner tests were subjected to eccentrically applied thrust in a testing machine so that thrust and moment were present in varying combinations at the joint. These joints were also cast of steel-fiber-reinforced concrete,and methods are presented to calculate their strength. These methods are then compared with the test results.