考虑黏聚力的上下加载面修正剑桥模型及数值实现

 首先完善上下加载面模型中超固结状态参数R与结构性状态参数R*的定义，给出上下加载面修正剑桥模型更具普适性的推导过程；然后介绍考虑黏聚力的上下加载面修正剑桥模型的半隐式本构积分算法及数值实现过程，并基于ABAQUS软件所提供的用户材料子程序UMAT接口编制上下加载面修正剑桥模型本构子程序；利用该模型模拟不同工况以及不同加载方式下超固结和原状土体的力学特性，以验证该本构模型对原状超固结土体的模拟能力以及所编写子程序的正确性和可靠性；最后进行Boom Clay三轴固结不排水剪切试验的模拟，完成将上下加载面修正剑桥模型应用于工程实际的关键一步。

SUPER-SUBLOADING SURFACE MODIFIED CAM-CLAY MODEL CONSIDERING COHESION AND ITS NUMERICAL IMPLEMENTATION

The definitions of overconsolidation state parameter and structural property state parameter is further perfected firstly and a more popular derivation of this model is offered. Then the numerical implementation is completed based on the semi-implicit algorithm and the constitutive subroutine is compiled by using UMAT in ABAQUS for the improved model considering the cohesion. Finally，the complicated mechanical properties of the overconsolidated and undisturbed soil are simulated under different conditions and various loading types. The result implies that the model owns excellent simulation capabilities and the UMAT subroutine ensures sufficient accuracy and stability. Therefore，the key step to apply this constitutive model into engineering practice has been successfully accomplished.