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为了了解不同高程的地基弹性模量对拱坝应力和位移的影响,以某混凝土双曲拱坝为例,依据拱坝的受力特性将地基分为三种材料分区,对应三种分区选取了三种计算方案,采用有限元分析软件ABAQUS分析了三种方案下拱坝对地基弹性模量的响应特性。结果表明,坝体第一主应力较第三主应力对地基弹性模量的变化更加敏感;地基弹性模量小于坝体弹性模量的40%时,地基弹性模量对坝体的应力和位移影响最为显著;加大坝体中上部地基的弹性模量和降低坝体下部地基的弹性模量,均可降低坝踵处的第一主应力。
In order to understand the effect of subgrade elastic modulus of different elevation on the stress and displacement of arch dam, taking a certain concrete double curvature arch dam as an example, the foundation is divided into three kinds of material zoning according to the stress characteristics of arch dam. Three kinds of calculation schemes, the finite element analysis software ABAQUS analysis of the three options under the arch dam response to the elastic modulus of the foundation. The results show that the first principal stress of the dam is more sensitive to the change of the elastic modulus of the foundation than the third principal stress. When the elastic modulus of the foundation is less than 40% of the elastic modulus of the dam, the elastic modulus of the foundation affects the stress and displacement of the dam The most significant impact; to increase the upper part of the dam foundation elastic modulus and reduce the lower dam foundation elastic modulus, can reduce the dam at the first principal stress.