With the development of geosynthetics, more and more soil filled geotextile containers have been used in coastal engineering, such as dikes, groynes and revetments. This paper reports the field testing as well as finite element numerical analysis on the practical case of sand filled geotextile container dike on soft soil foundation in coastal areas, and the performances of dike were captured and discussed, including vertical and lateral deformations. In order to improve the dissipation of excess pore water pressure of foundation soil (i.e. mud clay) due to dike construction, the prefabricated vertical drains (PVDs) were installed in foundation. The measured data and computed results show the PVDs are effective to improve the consolidation of foundation soils, the settlement and lateral displacement of dike can be reduced as well, and the maximum lateral displacement was about 0.63m located at the first ground layer of mud clay. As a result of the reinforcement of geotextile container, the settlement and lateral displacement of dike have been obviously reduced. According to the computational analysis on the stability of sand filled geotextile container coastal dike using the shear strength reduction method, the geotextile container are helpful to improve the stability of dike and the potential sliding surface generally existed in the dike body without the reinforcement of geotextile.
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