中文摘要：

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。

英文摘要：

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.