Firstly

aiming at the deficiency and limitation of traditional damage theory and starting with the discussion on rational definition of damage geomaterials

a new damage model suiting for saturated soils is established by discussing the microcosmic mechanical mechanism of damage of saturated soils. Secondly

a statistical damage constitutive model which can simulate the full process of deformation of saturated soils under special confining pressure has been erected by introducing statistical damage theory; and then the method for determining the model’s parameters is also developed based on experimental curves of triaxial compressive test of saturated soils. Finally

a rational revised technique for the model has been developed through investigating the relations between the model’s parameters and the confining pressure. Finally

a unified statistical damage constitutive model for saturated soils has been obtained which can be applied to different confining pressures. It is indicated by comparison between theoretical and experimental results that the model is reasonable which can not only reflect the full process of deformation of saturated soils but the effect of water in soils on the deformation of saturated soils.