sledgehammers were dropped down freely to hit the load board to simulate the wave force acted on concrete layer, and the excess pore pressure and strength variation were observed;

• 通过研究发现，（1）硬壳层土体基本上处于超固结状态，且超固结比随深度增加而减小，大王北和刁口地区硬壳层强度约是新滩和广利港的两倍，离河口近的地区强度的变异系数比远的地区的要大；