K0超固结土的统一硬化模型

将所建立的超固结土模型推广为能够反映超固结土的初始应力各向异性的弹塑性模型。它是通过将潜在强度Mf、特征应力比M和状态应力比ηk引入到模型的统一硬化参数中,使模型具有预测超固结土的初始应力各向异性、剪缩、剪胀、硬化、软化和应力路径依赖性等基本特性的功能。采用SMP强度准则并结合变换应力方法对模型实现了三维化。通过与试验结果比较表明,提出的模型能够较好地描述初始应力各向异性超固结土的应力应变特性。

A unified hardening model for K0 overconsolidated clays

The constitutive model for overconsolidated clays proposed by the authors was extended to an overconsolidated clay model with stress-induced initial anisotropy.By introducing the potential strength ratio Mf,the characteristic stress ratio M,and state stress ratio ηk into the unified hardening parameter,the proposed model could well simulate many characteristics of overconsolidated clays,including stress-induced initial anisotropy,stress dilatancy,strain hardening and softening,and path dependency behaviour.Based on the SMP criterion and the corresponding transformed stress tensors,the proposed model could be applied conveniently to soils under three-dimensional stress states.It was shown by comparison between the predicted and test results that the stress-strain properties of overconsolidated clays with stress-induced initial anisotropy could be well described by this model.