剑桥模型可反映剪切变形的一种修正  

Research on modifying Cam-clay model considering shear deformation

作　　者：杨林德[1] 张向霞[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《岩土力学》2007年第1期7-11,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50378069)。

摘　　要：由于剑桥模型不能很好地反映土的剪切变形,因此,在工程应用中不能够反映土的实际受力变形特征。对剑桥模型的这一缺点进行理论分析,指出产生此现象的原因,提出由剪应力和体应力引起的应变分量,分别采用不同的分配比例系数,基于这种思想并采用剪切试验结果对剑桥模型进行修正,给出了基于不同分配比例系数修正后的剑桥模型的应力-应变关系计算式。通过采用剪应力与轴向应变修正后的模型与剑桥模型的预测结果的对比,揭示了修正后的模型能够较好地反映剪切变形,同时模型含有可直接测定的4个独立的试验参数。The shear deformation of soil can not be considered sufficiently by Cam-clay model and the actual deformation characteristic of soil material can not be reflected in engineering projects. In the paper this disadvantage of Cam-clay model is theoretically analyzed firstly; and the idea of adopting different proportional coefficients to strain components induced respectively by shear stress and volume stress is proposed; then based on the idea and using the shear test results performed by Nanjing Hydraulic Research Institute, the Cam-clay model is modified; and the concrete stress-strain formulas of modified Cam-clay model are presented also. The comparison of the computed results of correlation between shear stress and axial strain by the improved model and the Cam-clay model shows that the shear deformation can be considered effectively in improved Cam-clay model. Besides, the four material parameters in modified model are easy to be measured.

关 键 词：剑桥模型 剪切变形 分配比例系数 修正 

分 类 号：TU431[建筑科学—岩土工程]