在总结了基于传统塑性理论上限法内力功的计算方法的基础上，将基于广义塑性理论的上限法应用到杨俊杰的内力功计算方法中。
In this paper, stability of soil foundation is simulated by means of analytical limit analysis in which generalized viscoplasticity is introduced by augmented Lagrangian technique.
多重势面模型直接从数学原理出发建立本构关系，避开了传统塑性理论中屈服面的概念，为研究岩土工程材料本构模型提供了新的思路。
The multi-potential surface model in strain space is more practical, since its parameters are easy to be determined, and the program based on the model is easy to be developed.
多重势面模型直接从数学原理出发建立本构关系，避开了传统塑性理论中屈服面的概念，为研究岩土工程材料本构模型提供了新的思路。
The multi-potential surface model in strain space is more practical, since its parameters are easy to be determined, and the program based on the model is easy to be developed.
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