Drucker-Prager系列屈服准则在稳定分析中的应用研究

Drucker-Prager(D-P)系列屈服准则作为Mohr-Coulomb(M-C)准则的修正模型在岩土工程中得到了广泛应用.然而采用不同的D-P系列屈服准则可能会得到差距较大的结果,文中对不同D-P系列屈服准则进行了比较系统的比较,指出了D-P系列屈服准则相互之间的关系,揭示了准则的物理意义,给出了不同准则之间的转换公式,论证了准则转换强度折减的本质,进而提出了一种在D-P系列屈服准则间进行边坡安全系数转换的新方法.采用ANSYS软件通过算例分析,对比不同D-P准则计算结果,得出了一些有益的结论,数值分析结果有力地验证了本文有关理论的正确性.

Application Study of Drucker-Prager Yield Criteria to Stability Analysis

The Drucker-Prager yield criteria are widely used in geotechnical engineering as modified models of Mohr-Coulomb criterion. Great differences may be made between results with diferent Drucker-Prager yield criteria. The relationships between different criteria and their physical implication are studied systematically. The transformation method of different Drucker-Prager yield criterion was proposed and its essence of strength reduction theory is shown. A new slope safety factor conversion formula with Different Drucker-Prager yield criteria was deduced. Different Drucker-Prager yield criteria are adopted by ANSYS to analyze stability rules of rock mass in different zones and a 2-D slope stability. A few of valuable results were obtained by comparing the solutions of different Drucker-Prager yield criteria and Mohr-Coulomb yield criterion. The results could be applied to the analysis of practical geotechnical engineering.