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某水电站拦河坝拟为沥青混凝土心墙堆石坝,坝体填筑在厚度达90多m的深厚覆盖层基础上,研究覆盖层对坝体应力变形的影响很有必要。计算中,土石料本构模型采用邓肯E-B非线性弹性模型,混凝土防渗墙与地基覆盖层之间可能存在较大相对位移,为模拟覆盖层与混凝土之间可能的滑动,设置了接触面单元,接触面单元采用Goodman无厚度单元。对计算过程中本构模型的建立进行简单论述,并提供计算分析的基础参数。
A dam of a hydropower station is proposed as an asphalt concrete core wall rockfill dam. The dam body is filled with a deep overburden of over 90 m thickness. It is necessary to study the influence of overburden on the stress and deformation of the dam body. In the calculation, the soil-rock constitutive model adopts the Duncan EB nonlinear elastic model, and there may be a large relative displacement between the concrete cutoff wall and the foundation covering layer. To simulate the possible sliding between the cover and the concrete, a contact surface unit , Contact surface unit using Goodman no thickness unit. The establishment of the constitutive model in the calculation process is briefly discussed, and the basic parameters of the calculation and analysis are provided.