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Abstract Research purposes: The construction is difficult and its risk is high in safety when excavation of metro tunnel crossing bridge and river is conducted. At present, there is a little experience to learn, so it is significant to do research on the construction technology for it for the purpose of ensuring the construction safety.
Research conclusions: The following measures are adopted in order to ensure construction safety : the waterproof blanket is laid on the river bottom, the stratum water is dried by precipitation in advance, the bridge response is predicted with 3D seepage and stress coupled numerical analysis method, the tunnel reinforcing schemes are compared, and the space-time effect of bridge foundation is evaluated by 3D FEM. It shows after taking these measures, the max settlement of bridge foundation is 34. 7 mm, and the max differential settlement is 6. 2 mm. The construction practice proves this construction scheme is reliable and safe, which can provide the reference to similar construction.
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2008, Vol. 25 
