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Mechanical Characterization of Joints in Segmented Tunnel Liners Due to Thrust Jack Loading
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2022-12-01
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[PDF-34.56 MB]
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Edition:Final Report (Oct. 2020 to Sept. 2022)
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Abstract:Precast segmental tunnel liners, installed via tunnel boring machines or TBMs, have become increasingly used in modern tunnel construction. The performance of the circumferential joints due to in-plane loading will influence the response of the liner to other types of loading during tunnel operation. This study evaluates the capacity of the circumferential joints for thrust jack loading. Six tests have been conducted to investigate the effect of conventional reinforcement bars, eccentricity, loading and boundary conditions (double- or single-point loading) during the tunnel liner segment installation, with a thrust load that goes up to 22241 kN (five million pounds). All the segments, when subjected to single point loading that went up to 22241 kN (five million pounds), have significant damage, especially the segments that have only been reinforced with steel fibers. Their ultimate capacity is significantly lower than the segments reinforced with steel fibers and steel bars, and the failure is more brittle. The current design method for precast SFRC tunnel liner segments overestimates the loading capacity. The standards and guidelines for precast segmental tunnel lining design for different loading, boundary conditions and reinforcement type are needed.
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