观音岩混合坝插入式接头应力变形分析

采用有限元方法,利用邓肯E-B模型及接触面模型,模拟堆石坝的实际填筑和蓄水过程,对观音岩水电站混合坝方案插入式接头结构型式进行三维非线性分析。计算结果表明,在蓄水前后,接头处各接触面上下游堆石部分都有脱开现象,心墙与混凝土在顶部有小范围脱开现象。插入式软接头方案基本可行,可在此基础上进行进一步计算分析,提出相应的优化和改善措施以提高运行可靠度。

Analysis on stress and deformation of inserted junction for composite dam of Guanyinyan Hydropower Station

Based on finite element method,a 3-D nonlinear analysis is made on the structure pattern of the inserted junction for the composite dam alternative to the dam of Guanyinyan Hydropower Station with simulation of the processes of both the construction and the impoundment of the rockfill dam by Duncan E-B model and interface model.The computation results show that each interface of both the upstream and downstream rock-fill sections and between the core and the concrete partly splits at the top before and after the impoundment.However,the alternative of the inserted junction is feasible basically,but the further analysis and computation are to be made on the basis of this,so as to give the relevant optimized and improved measures to enhance the of reliability of the operation concerned.