把修正剑桥模型推广为适合于黏土和砂土的简单、统一三维本构模型是基于以下两点提出的 :第一点 ,把由笔者已提出的基于SMP准则的一个变换应力张量用于修正剑桥模型使其简单实现了三维化 ,改进的模型对于黏土实现了从剪切屈服到剪切破坏的统一及临界状态理论同SMP准则的结合 ;第二点 ,为了建立对于黏土和砂土简单、统一的本构模型 ,推导出了一个新的硬化参数 ,新硬化参数不仅能描述砂土不同程度的剪胀性 ,对于正常固结黏土又能退化成塑性体积应变 ,所提硬化参数的合理性也被各种路径下分别在三轴压缩和三轴伸长下的试验结果所证实。所提模型的计算参数仅为 5个常规试验参数 ,易于确定 The simple and uniform three-dimensional constitutive model that extends the modified Cambridge model to clay and sand is based on the following two points: First, a transformed stress tensor based on the SMP criterion that the author has proposed is used to correct The Cambridge model makes it simple and easy to realize the three-dimensional model. The improved model realizes the unification and critical state theory from shear yielding to shear failure with the combination of SMP criterion and clay. Secondly, in order to establish a simple, Unified constitutive model, a new hardening parameter is deduced. The new hardening parameter can not only describe the dilatancy of sand to varying degrees, but also degenerate into plastic volumetric strain for the normal consolidated clay. The reasonableness of the hardening parameter It is also confirmed by the test results of triaxial compression and triaxial elongation under various paths. The calculation parameters of the proposed model are only five routine test parameters, easy to determine