Abstract：According to the variation characteristics of deformation parameters caused by the interstitial compressibility of foundation soils，the nonlinear settlement calculation method of strip foundation is improved. Through further studying the mechanism about the effect of additional stress and stress history on foundation soil modulus，the analytical models that reflect the mechanical deformation parameters of foundation soils which change with additional stress and stress history are established. Then，a new computational method for nonlinear settlement of strip foundation is put forward based on the traditional layer-wise summation method for calculating foundation settlement，in which the nonlinear characteristic of ground settlement calculation and an idea for stepwise loading are incorporated. Consequently，this method not only reflects the characteristics in which the deformation parameters of foundation soils change with additional loads，but also the effect of different soil moduli induced by different initial stress levels or different stress histories on foundation settlement computation. Moreover，the using of the compression test curves in foundation settlement calculation is avoided efficiently. Finally，by comparing the computation and analysis of an engineering example with actually measured and calculated settlements and results by other methods，it is shown that the proposed method is reasonable and feasible.
