【摘要】 根据黏土应力-应变曲线的特点及其应力路径的相关特性,将作者所建立的砂土应力路径本构模型扩展用于黏土,建立了黏土的应力路径本构模型,利用变换应力方法将SMP准则用于黏土的应力路径本构模型,使模型得到了合理的三维化。黏土的应力路径模型与修正剑桥模型相比,在双向加载A区和卸载D区二者完全相同;在单向加载B区和F区,两种模型均可计算塑性应变;特别是在C区和E区,黏土的应力路径模型可计算塑性应变,而修正剑桥模型的塑性应变为0。通过与修正剑桥模型比较和对藤森黏土试验结果的预测,反映了黏土应力路径本构模型描述黏土在不同应力路径条件下应力-应变特性的优越性。更多还原

【Abstract】 According to the characteristics of stress-strain curve of clay and the relating characteristics of its stress path,a sand stress path constitutive model established by authors is extended to clay;thus a clay stress path constitutive model is proposed.Through the transformed stress method,the SMP criterion is applied to the clay stress path constitutive model;then the model can describe the general stress states reasonably.The clay stress path constitutive model is identical with the modified Cam-clay model when they are in the condition of bidirectional loading(area A) and unloading(area D);there are different methods for computing plastic strain in the condition of single-direction loading(area B and F);specially,in the area C and E,the clay stress path constitutive model can compute plastic strain which will be zero if the modified Cam-clay model is used.Compared with the prediction of the modified Cam-clay model on the test data of Fujinomori clay,the superiority of the clay stress path constitutive model is demonstrated when describing the characteristics of stress-strain of clay in the condition of different stress paths.更多还原