Abstract：Research purposes:Taking the tunnel anchor of the 760 m suspension bridge of Youxi Yangtze River Bridge as an example, the stress mechanism and failure mode of the tunnel anchor were studied by theoretical calculation, numerical simulation and in-situ test. The test method and process are introduced, and the test results are analyzed in detail, which provides the basis for design optimization. Research conclusions:(1) The safety factor of tunnel anchor calculated by the theoretical formula is conservative, mainly because the formula ignores the favorable factors of the interaction between surrounding rock and anchor block, and the geotechnical parameters provided by the general geological survey report are also conservative, which has a certain gap with the in-situ geotechnical test parameters. (2) The numerical simulation is also greatly affected by surrounding rock parameters and has a large error with the test results, but it can be used as a reference for the preliminary design. (3) According to the scale model test, the original design of 40 m long anchor plug of Youxi Yangtze River Bridge has a peak strength of 18P, yield strength of 11P, and proportional ultimate strength of 4P, which has a large surplus and can be appropriately reduced for optimization. (4) The research results can provide reference for the design and test of tunnel anchors of long-span suspension bridges.
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2023, Vol. 40 
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