岩土工程中常用屈服条件的对比研究

Comparative Study of Usual Yield Conditions in Geotechnical Engineering

通过对岩土工程中常用屈服条件的理论分析、算例和对比研究,得出如下结论:采用不同的广义Von Mises条件来逼近Mohr-Coulomb条件时,应该根据具体的问题以及材料参数选择相应的广义Von Mises条件;一般情况下的岩土工程问题,采用Drucker-Prager条件似乎偏于保守,真正的逼近Mohr-Coulomb条件应该介于内角圆和外角圆之间;内角圆偏于保守而外角圆偏于危险,等面积圆是相对合适的折中选择。

Based on theoretical analysis and calculation example, the usual yield conditions in geotechnical engineering are comparatively studied, and such conclusions are drawn：whenever apply different generalized Von Mises conditions to approximate Mohr-Coulomb condition ,we should select corresponding generalized Von Mises condition according to the specific problem and its material parameters. Generally ,Drucker-prager condition is inclined to be conservative ,and the accurate one that approximates Morh-Coulomb criterion is between interior and exterior vertex circle. Interior vertex circle is inclined to be conservative and exterior vertex circle is inclined to be dangerous as well, and so, the equal area circle is the relative well-founded compromise choice.