超固结土三轴排水不排水试验数值分析

在临界状态土力学的框架内,采用Hashiguchi提出的下负荷面本构模型,建议了一个简化的塑性硬化规律,使之能较合理地描述超固结粘土在正常屈服面和下负荷面之间的变化规律。数值模拟结果表明,修正后的硬化规律能够较好地描述超固结粘土的许多力学特性如应力应变关系、应变软化以及应力剪胀性等。数值预测结果与室内三轴排水试验结果相一致,并可以用来分析超固结粘土的不排水三轴应力路径。

Numerical Analysis of Drained undrained Triaxial Tests for Overconsolidated Clays

In the framework of critical state soil mechanics,a simplified hardening law is proposed to describe the change between subloading surface and the normal consolidation surface with plastic deformation based on subloading surface concept proposed by Hashiguchi.The characteristics of overconsolidated clays,such as stress-strain relationship,strain hardening and softening and stress dilatancy are simulated,and the results are in accordance with the data from triaxial drained compression test.Numerical model is also used to predict the stress-strain relationship in the isotropic consolidation condition and the stress paths in the undrained triaxial compression tests.