Underwater push-out docking method was adopted in the final joint of Shenzhen-Zhongshan Link immersed tunnel,and the MGB slide-rail was used as the bottom sliding system during the push-out process.A test structure with the same load as the construction site was established in order to analyze the structural stress.The friction coefficient between MGB slide-rail and anticorrosive coating in final joint of Shenzhen-Zhongshan Link under different construction loads and lubrication conditions was studied by using the test structure,and was compared with the friction coefficient provided by the manufacturer.The research results indicate that the friction coefficient of MGB material decreases with the increase of load.The static friction coefficient ranges from 0.181 to 0.266 in the case of dry friction,and the sliding friction coefficient ranges from 0.150 to 0.226.The friction coefficient under water lubrication conditions is smaller than dry friction,and it is related to the contact interface.It is recommended to test the friction coefficient based on the actual load and friction interface conditions in engineering project.
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