基于Drucker-Prager系列准则的抗剪强度参数分析  

Analysis on Shear Strength Parameters Based on Drucker-Prager Yield Criteria

作　　者：李磊[1] 张孟喜[1] 

机构地区：[1]上海大学土木工程系

出　　处：《上海交通大学学报》2013年第9期1404-1408,1418,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(41172238);上海市教委科研创新项目(11ZZ88);上海大学研究生创新基金项目(SHUCX120150)资助

摘　　要：在真三轴应力状态下建立了岩土材料内摩擦角与中主应力系数的函数关系,通过与砾石料、Q_2黄土和Santa Monica Beach砂的真三轴试验结果对比,探讨了基于Drucker-Prager(D-P)系列屈服准则的内摩擦角与中主应力系数的关系,以及D-P系列屈服准则的适用性.结果表明:当中主应力系数取特定值时,D-P系列屈服准则中内摩擦角的理论值与试验值相等;在不同应力状态下,岩土材料应选用合适的D-P系列屈服准则,以使内摩擦角的理论值与试验值基本吻合.The mathematical expressions of internal friction angle considering the influence of intermediate principal stress under true triaxial stress were deduced. After a comparison of the results of the true triaxi- al tests of gravel, Q2 loess and Santa Monica Beach sand, the relationships between internal friction angle and intermediate principal stress coefficient were studied based on DP yield criteria. The results show that the calculated values of internal friction angle with D-P yield criteria equal the testing results when the intermediate principal stress coefficient is suitable for the corresponding criterion. In order to obtain reasonable results, appropriate D-P yield criteria should be chosen for different materials.

关 键 词：岩土力学 Drucker—Prager系列屈服准则 中主应力 内摩擦角 真三轴试验 

分 类 号：TU41[建筑科学—岩土工程]