Soft clay has viscoelastic characteristics

which affects the consolidation and deformation of the soil. Based on the existing one-dimensional consolidation theory of saturated clays with generalized Voigt model

the generalized solution expressions of the two layers are obtained. According to the pore pressure and water flow continuity conditions at the conjunction plane of two layers and the boundary conditions at the top and bottom surfaces

the orthogonal relation of the system is presented. The unknown value in the generalized solution expressions can be determined by using continuity conditions

boundary conditions and the orthogonal relation. Generalized Voigt model can reflect the stress-strain relation of the soil at different phases; so the solutions can be applied extensively. A case of double-layered viscoelastic ground is analyzed where Merchant rheological model is applied. It is shown that the viscoelastity decreases the consolidation velocity of the soil. The more deep the soil element locate

the more its consolidation velocity is affected.