Abstract:

The causes for the hollowing between the steel bottom plates and the structural concrete of the immersed tubes of the immersed tunnel from Shengwudao to University Town in Guangzhou are studied, the adverse impacts of the hollowing on the tunnel structure are analyzed, the countermeasures to prevent the hollowing and the treatment measures for the hollowing are presented. It is concluded that the defect of the hollowing of the steel bottom plates can be effectively controlled, the water leakage of the tunnel can be minimized and the quality of the prefabricated immersed tubes can be guaranteed, provided that the prefabrication process of the immersed tubes are strictly controlled and necessary repairing measures are taken.

Key words: immersed tunnel, steel bottom plate, hollowing, countermeasure