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Abstract The undersea tunnel of Zhoushan Putuo District Shenjiamen Harbor in north shore is constructed by the way of open excavation. Shenjiamen Harbor is located in shallow sea area. At the beginning of construction，sand soil cofferdam was used to cut off sea water. Monitoring data show that sand bag used in silt soil is susceptible to water erosion of sea water tidal fluctuation and water level change，which will cause large deformation. The maximum settlement and horizontal displacement are 74.1 cm and 216.6 cm，respectively. The safety factor of cofferdam calculated by Bishop method is not satisfied，adjustment of the cofferdam should be made based on field monitoring and calculation. However，when the steel pipe pile was introduced to the cofferdam，settlement and horizontal displacement are effectively controlled. The results provide a reference for the construction and design of geomembrane bag with sand soil cofferdam in deep foundation of undersea tunnel under conditions of coastal muddy land.
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Received: 02 May 2013
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2013, Vol. 32 
