Abstract: There is divergence of opinions on the effect of geosynthetic reinforcement and the selection of suitable geosynthetic materials; it is a constraint for its appropriate application. This paper investigates the mechanical behavior and the contribution of reinforced materials with an reclamation engineering example in Pinghu, Zhejiang province. Besides, in-situ test is made using improved displacement gauge. Based on the numerical analysis and in-situ test, further discussion is made on the type and the corresponding design parameters of reinforced materials. And some valuable conclusions are drawn as follows; the uniaxial-tensile geogrid should be put into the first place for the treatment of sea dike; the upper and lower bounds of the limit elongation should be prescribed, and so on

Key words: geosynthetic reinforcement, numerical analysis, in-situ test, soft foundation, sea dike, geogrid