Study on Tunnel Depth under the Action of Repeated Anchoring of Ships in Anchorage
To determine the minimum buried depth reasonably for the design of the underwater tunnel crossing under anchorage waters,the cross-river tunnel project is taken as an example,and an experimental study is conducted to predict the ultimate scour depth of the riverbed in the anchorage waters.The finite element software ABAQUS was used to study the action of multiple anchoring on the soil of the riverbed,and its influence on depth into the soil was given.The results showed that the lowest elevation of the bed of the anchorage is-28.2 m,and the disturbance of soil mass caused by repeatedly anchoring reduces the shear strength of the soil layer on the bed surface.The depth of embedment is 3.61 m and the impact depth is 2.61 m for a 30 000-tonnage ship in repeated anchoring,while the depth of embedment is 3.9 m and the impact depth is 2.89 m for a 50 000-tonnage ship.From the viewpoint of safety,the tunnel should be buried at least-34.99-meter below.The research can provide theoretical guidance for the buried depth design of underwater crossing structures in anchoring and berthing areas.
dropping anchor repeatedlylimiting scourpenetration depthinfluence depth of impact forcetunnels engineering
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