Abstract: During the consolidation of soil samples, the soil is affected by surrounding stresses, the pore water is dissipated, the pore voidsare gradually reduced, and the relative positions of soil particles are also rearranged. Some large pore voids are closed by the compression, and the connections among the particles gradually reduces the permeability. With the increase of the stress around on the soil sample, the density of the soil becomes larger, and the relative strain of the soil is smaller. For the structural clay samples of Zhanjiang Formation, when the consolidation pressure increases to a certain value, the structure of the soil sample is destroyed, and then the structure is solidified. Within this pressure region, the pressurized permeability coefficient is in a state of random change, and the porosity ratio, pressure series and density of soil samples are independent.

Key words: Zhanjiang Formation, Structural Clay, Pressurized Permeability Coefficient, Stepwise Changes, Microstructure