碾压混凝土坝层面影响带黏弹塑性流变模型

Viscoelasto-plastic rheological model of effect zone for RCCD

针对碾压混凝土坝施工层面影响带渐变力学特性,基于坝体层内材料横观各向同性假定,依据复合材料分析思路和串、并联模型理论,建立了碾压混凝土坝层面影响带渐变规律分析模型,并针对其渐变特性,提出了层面影响带厚度、弹性模量以及黏性系数等计算参数的确定方法,建立了相应的黏弹塑性流变分析计算流程,并编制了相应的有限元计算程序。实例表明,本文提出的碾压混凝土坝层面影响带主要计算参数的确定方法以及建立的黏弹塑性分析模型能客观地模拟大坝结构变化形态,其计算结果与原位监测成果吻合较好。同时,文中所建立的分析模型可推广应用于常态混凝土坝,尤其是坝基有夹层或断层等变形规律的分析。

Based on the assumption of transverse isotropy of the dam layer material and considering the properties of gradual change of mechanical parameters, an analytical model of gradual change law of effect zone for RCCD has been built which is relying on the analysis methods of composite material and series and parallel model theory. The method to calculate the thickness, elastic modulus and adhesive coefficient of effect zone is proposed, and the characteristics of gradual change of mechanical parameters are revealed as well. On the basis of the study, the calculation flow of the viscoelasto-plastic rheologieal model and corresponding finite element calculation program are set up. The examples show that the method for determining parameters and the analytical model can simulate the changes of dam structure objectively and calculation results can match well with the in-situ monitoring data. Further, the analytical model which is proposed in the thesis can be applied into the normality concrete dams, especially for the analysis of the deformation law of the dam foundation which exists interlayer and faults.