考虑中主应力的常用破坏准则适用性研究  

INVESTIGATION ON APPLICABILITY OF COMMON FAILURE CRITERIA CONSIDERING INTERMEDIATE PRINCIPAL STRESS

作　　者：赵春风[1,2] 杨砚宗[1,2] 张常光[1,2] 李永刚[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《岩石力学与工程学报》2011年第2期327-334,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40972180);上海市重点学科建设项目(B308)

摘　　要：针对岩土工程中常用的考虑中主应力效应的5种破坏准则,推导各准则考虑中主应力影响的内摩擦角表达式,建立真三轴应力下内摩擦角与中主应力系数的关系,探讨中主应力的影响规律。与砾石料、密砂和黄土3种材料的真三轴试验结果进行比较,并采用标准差量化方法,探讨各准则对中主应力的反映程度及其适用性。研究结果表明:5种破坏准则均不同程度地反映中主应力效应,Drucker-Prager准则计算拟合效果较差,修正Lade-Duncan准则拟合效果较好,其余3个准则拟合程度相当,对于不同的材料应选用不同的破坏准则。According to the five most common failure criteria considering the influence of intermediate principal stress,the corresponding internal friction angle expressions considering the influence of intermediate principal stress are deduced. The relationships between internal friction angle and intermediate principal stress coefficient under true triaxial stress are established;and it is a new perspective of discussing the influence law of intermediate principal stress. Based on the comparison with the true triaxial test results of gravelly soil,dense sand and loess,the reflection degree of the intermediate principal stress considered in each criterion is studied and the applicability is discussed with the quantitative analysis of standard deviation. The study results show that the five criteria reflect intermediate principal stress to different extents. The fitting effect of Drucker-Prager criterion is the worst and that of modified Lade-Duncan criterion is the best,while the fitting effects of the other three failure criteria are almost the same. Different criteria should be chosen for different materials.

关 键 词：土力学 中主应力 破坏准则 真三轴应力 内摩擦角 标准差 

分 类 号：TU41[建筑科学—岩土工程]