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１ 引 言*仅有一个屈服面的弹塑性模型（如修正剑桥模型［１］），不能很好地模拟土的剪胀性及ｐ（平均主应力）减小和ｑ（偏应力）不变的应力路径下的应力应变关系，为克服这些缺点，许多人提出了双屈服面模型。殷宗泽提出的双屈服面模型［２］也属于这一类，由于该模型在
1 INTRODUCTION * There is only one elasto-plastic model of yield surface (such as the modified Cambridge model [1]), which fails to well simulate soil dilatancy and p (mean principal stress) reduction and q (deviatoric stress) In order to overcome these shortcomings, many people put forward a double yield surface model. The dual yield surface model proposed by Yinzong Ze also belongs to this category because of the model