基于统一硬化参数的旋转硬化模型

为反映应力诱导各向异性特性,在统一硬化模型以及超固结土模型的基础上,结合屈服面的旋转硬化机制,将以往只反映等向硬化机制的模型推广为混合硬化模型。分别对黏土的排水应力路径以及砂土的不排水应力路径的应力-应变关系进行预测。结果表明:所提模型不仅能较好地描述黏土材料在循环加载条件下的应力-应变关系;同时,对于不同初始条件下的饱和砂土在循环加载条件下的应力-应变关系也能作出合理预测,验证了所提模型的合理性。

ROTATIONAL HARDENING MODEL BASED ON UNIFIED HARDENING PARAMETER

A mixed strain hardening constitutive model,which can describe the induced anisotropy of soils,is proposed combining the rotational hardening mechanism with the unified hardening model.The drained stress path for clay and the undrained stress path for sand are predicted using the proposed model.It is indicated that the proposed model can describe both the stress-strain relationship of clay and the stress-strain relationship of the saturated sand under various cyclic loading conditions well.