Abstract: The soft soil of interactive marine and terrestrial deposit, which is a kind of poor subsoil widely spreading over the Pearl River Delta, mainly consists of silt and mucky clay with silty/fine sand and has basic mechanical properties different from those of the marine soft soil. Based on a series of laboratory test results of the grayer silt-like soft soil from Q4W of Nansha, Guangzhou, the effect of consolidation on the mechanical properties, including permeability, shear strength, second consolidation, direct shear creep, triaxial compression creep, and rebound deformation, is systemically analyzed and studied, based on which the quantitative models are proposed. To facilitate engineering applications, the parameters of such models can be determined by simple and conventional experimental approaches.