关键词: 塑性势, 非关联流动法则, 应变空间表述, 弹塑性耦合, D-P-Y准则

Abstract: The origin, development and status of plastic potential theory are reviewed. During two ranges before and after the peak of the complete stress-strain curve for geomaterial, the material stabilities are different, so, the constitutive relation should be expressed in strain space. The constitutive equations of the plastic potential theory expressed in strain space and in stress space are presented. The elasto-plastic coupling theory for geomaterial is also discussed. The constitutive equation of plastic potential theory is commonly used for finite element displacement method, and is a practical formulation expressed in strain space. The elasto-plastic coupling theory is rigorous and self-contained, but parameters of the stiffness deterioration for geomaterial need more experimental data.

Key words: plastic potential, non-associative flow rule, strain space formulation, elasto-plastic coupling, D-P-Y criterion