土的本构理论是理论土力学的重要内容，著名的剑 桥粘土弹塑性本构模型被看做现代土力学的开端，是当前在土力学领域内应用最广的模型之 一。为此简要介绍了剑桥模型及修正的剑桥模型，并对剑桥模型的发展进程作了较为系统的 评述，分析总结了剑桥模型的局限性，指出在剑桥模型基础上针对其局限性进行改进和修正 仍是岩土材料建模的重要方向。

Constitutive modeling theory for soils is very significant in geotechnical engineering. The Cam - Clay elasto - plastic model is widely regarded as the milestone of modern soil mechanics. The concept of the model has explicit geometric and physical meanings. The Cam - Clay model and its modified model are regarded as one of several well accepted models among many proposed models. The improvement and revision based on the Cam - Clay model are the important aspect of modeling for geomaterial. In this paper, the Cam - Clay model and its modified model are introduced in brief, its limitation i
s analysed and an overview on the improvement of this model is given to farther
study. 