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This paper is a study for behaviour of cavern type anchorage tunnels for suspension bridges with cable tension. Anchorage behaviour, design method for anchorage, and failure surface angle, δ are analyzed by comparing numerical analysis results and ultimate pullout capacities(Pu) using bilinear corelation equation. Results show that design depths for cavern type anchorage tunnels are easily checked with linear relationships for P/γ/H vs. displacement and Pu/γ/H vs. H/b. The analysis results of maximum shear strain distribution and plastic status show that failure shapes are closer to circular arc model than soil cone model which frequently used. To an easy calculation of the ultimate pullout capacity, we propose a simple bilinear failure model in this study. The calculated ultimate pullout capacities from the proposed bilinear corelation equation using two failure angles results are similar to the ultimate pullout capacities from numerical analysis.

numerical study on pull-out behaviour of cavern-type rock anchorages