面板堆石坝挤压式边墙的概化数值模型及应用

基于对挤压式边墙实际结构及工作性态分析,从合理性和简单性原则出发,建立了用于面板堆石坝应力位移有限元分析的挤压式边墙概化数值模型。该概化模型由等效板和等效接触面组成,分别采用了线弹性模型和清华接触面弹塑性损伤模型加以描述,其参数易于确定。采用该模型对某面板堆石坝应力变形进行了二三维有限元分析,并与原状模拟分析结果进行了对比。结果表明,概化数值模型能够合理地描述挤压式边墙的实际力学特性,且计算量较小,适用于面板堆石坝的应力变形有限元分析。

A simplified equivalent numerical model of extrusion-sidewall for CFRD and its application

A new equivalent numerical model was developed for evaluating the behavior of extrusion-sidewall adopted in CFRD (Concrete-Faced Rockfill Dam) and particularly its effect on the stress-deformation behavior of the concrete slab. It is composed of an equivalent plate and an equivalent interface. The equivalent plate is assumed to be linearly elastic and thus it is described with a linear elastic constitutive model. The equivalent interface is described with the Tsinghua elasto-plasticity damage interface constitutive model. All the model parameters can be easily determined. The equivalent numerical model was applied to two and three dimension FEM analysis of a practical CFRD. The results show that the equivalent numerical model and related numerical analysis method is effective to simplify the stress-deformation evaluation of CFRD adopting extrusion-sidewall technology with a sufficiently good degree of accuracy.