Analysis on Mechanism of Drain and Consolidation of Marine Soft Soil

The authors analyse marine soft soil microstructure in the process of consolidation,and find that the medium pole and small pore 1 000  are predominant. They hold free water. The micropore is secondary in undisturbed soft soil. With increment of consolidation pressure the medium pore changes into small pore, and the water content decreases to liquid limit, then the type of void water is bound water. The equivalent diameter of structure cell also increases with increment of consolidation pressure. Due to variation of pore water type the permeability coefficient decreases in power exponent with pressure increasing and time going. There is a turning point on the curve of consolidation deformation, and the coefficient of secondary consolidation is nonlinear in process of consolidation. In conclusion the permeability coefficient,deformation property,coefficient of secondary consolidation and pore pressure change with the type of pore water in consolidation process of marine soft soil.