黏性土宏细观参数相关性研究  

Study on the Relevance of Macro-micro Parameters for Clays

作　　者：陈建峰[1,2] 李辉利[3] 周健[1,2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海市地质调查研究院,上海200072

出　　处：《力学季刊》2010年第2期304-309,共6页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金资助项目(50508030);上海市重点学科建设项目资助(B308)

摘　　要：运用颗粒流程序中的bond原理结合Mohr-Coulomb破坏准则对黏性土双轴试验进行了数值模拟,探讨了黏性土宏观强度指标与其对应的细观参数之间的关系。分析结果表明,黏性土内摩擦角与颗粒摩擦角呈线性关系,黏性土黏聚力-颗粒接触强度两者拟合曲线的斜率与颗粒间摩擦系数呈幂函数关系,且两者的相关性都很好。通过该宏细观关系,得出上海第②层褐黄色粉质黏土细观参数,对其进行了双轴试验的颗粒流模拟,计算得到的应力应变曲线与实测结果一致。研究成果对于黏性土细观参数的取值及颗粒流模拟具有指导意义。Biaxial tests of clays were simulated based on the bond principle in particle flow code（PFC） combining Mohr-Coulomb failure criterion.The relationships between the macro-mechanical strength parameters of clays and their corresponding microscopic parameters were investigated and analyzed.The analyses show that the slope of cohesion-bond curve vs.the friction between particles can be well fitting to a power function;whereas the friction angles of clays and particles is of linear regression relationship.The microscopic parameters of Shanghai No.2 clay were derived according to the macro-micro relationships of clays and its biaxial test was simulated by PFC.The computed stress-strain curve was found to be in agreement with the measurements.The results have a guiding significance for determining the microscopic values of cohesive soils and PFC simulations.

关 键 词：颗粒流 黏性土 宏细观参数 相关性 

分 类 号：TU44[建筑科学—岩土工程]