连续临界状态模型在轴对称问题中的应用

Application of the Continuous Critical State Model in Axisymmetric Problem Cheng Y. M. (Department of Civil and Structural Engineering, Hong Kong Polytechnic) Tsui Y. (Department of Civil and Structural Engineering, University of Hong Kong)

摘要: 本文在麻省理工学院(MIT)应力法则基础上考虑了中间应力的影响,采用剑桥应力法则,提出了一种连续临界状态塑性理论,从而改进了Naylor的计算模型。并建议用一种简单而直接的方法来确定椭圆形边界面的共轭点和限制点(cut off point)。该模型比修正的剑桥粘土模型具有很多优点,可用于很多土力学问题。

Abstract: The authors have proposed a continuous plasticity version of the critical state model which is an improvement of the soil model as proposed by Naylor. In the present model, the stresses to be used are based on the Cambridge stress convention which have considered the effects of the intermediate principal stress as compared with the original model which is based on the MIT stress convention.The authors have also proposed a simple and direct method for the determination of the conjugate point and the cut-off point from the ellipse shape state boundary surface. The proposed model has many advantages over the original modified Cam-Clay model and is suitable for use in many types of geotechnical problems.