常规剑桥模型和修正剑桥模型是以正常固结和弱超固结土的三轴试验现象为基础建立起来的，且试样的初始应力状态为各向等压的球应力状态，将模型应用于K0固结状态的原状土必然引起不可忽略的系统误差。基于原状土K0固结线与等倾线之间的关系，在常规剑桥模型的基础上推导并得到了基于K0线的原状土剑桥模型和修正剑桥模型。在主应力空间中，该模型以K0固结线而不是以等倾线为轴线，因而能反映原状土的结构性和各向异性。既有试验数据的验证表明，与常规剑桥模型和修正剑桥模型相比，该模型能更合理的描述原状土的屈服和强度特性。

Two Cam-clay models, including the original and the modified, were established on phenomenon of the conventional triaxial tests on normal and lightly over consolidated soils. That is to say the initial stress state of the triaxial sample is isotropic other than anisotropic. Application of the two models on the intact soil in K0 consolidation inevitably leads to systematic errors that could not be ignored. Based on the relationship between K0 line and isoclinic line for the intact soil, the Cam-clay model and modified Cam-clay model for the intact soil were constructed by circumvolving the two models along a special line. The improved model can reflect the structure and anisotropy of intact soil due to K0 line taken as the axis rather than the isoclinic line in principal stress space. Experimental data verify that, the improved model can describe the yield and strength characters of the intact soil more reasonably than two Cam-clay models.