The elastic unloading is replaced by elasto-plastic, then the boundary surface model can be used to analyze the plastic deformation of soft clay during unloading process.

• 将传统边界面模型的线弹性卸载过程改进为弹塑性,建立了软粘土的边界面广义弹塑性模型,从而使边界面模型可用于分析软粘土卸载过程中的塑性变形问题。