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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 material in dam body and the theory of composite material and the model of parallel and parallel model, the gradual change rule of influence zone of roller compacted concrete dam is established. According to its gradation characteristics, a method to determine the influence parameters of layer thickness, elastic modulus and viscosity coefficient is put forward. The corresponding viscoelasto-plastic rheological analysis and calculation process is established and the corresponding finite element calculation program. The example shows that the method of determining the main calculation parameters and the viscoelastic-plastic analysis model proposed in this paper can objectively simulate the changes of the dam structure. The calculated results are in good agreement with the in situ monitoring results. At the same time, the analytical model established in this paper can be applied to the analysis of normal concrete dams, especially the deformation laws of the mezzanine or fault in the dam foundation.