观音岩水电站混合坝插入式接头设计研究

Design and Research of Inserted Junction in Composite Dam of Guanyinyan Hydropower Station

观音岩水电站拦河大坝由碾压混凝土重力坝和心墙堆石坝组成,两者之间采用插入式接头形式连接,接头高度达75 m,为目前国内最高的软接头。通过拟定多种比选方案,结合数值计算分析成果,从对接端面体形、心墙加厚及包裹、设置高塑性接触粘土、加强反滤保护等多个方面进行分析论证,优选出适合观音岩水电站的接头结构实施方案,解决了该混合坝工程建设的难题。

The dam of Guanyinyan Hydropower Station is composed of RCC gravity dam and core wall rockfill dam which is connected together with inserted junction. The height of inserted junction is 75 m, which is the highest soft joint in China. Different junction schemes are proposed, and the performances of junction schemes from the aspects of junction surface shape, core wall thickening and enclosing, setting high plasticity contact clay and strengthening filter protection are demonstrated based on numerical calculation results. The final junction scheme which suitable for Guanyinyan Hydropower Station is selected based on above researches. The applieation of inserted junction solves the problem in the construction of composite dam.