素混凝土桩复合地基在CCS水电站首部枢纽软弱地基中的应用

Composite Foundation of Plain Concrete Pile Applied in Soft Foundation of Head Works of Coca Codo Sinclair Hydropower Station

厄瓜多尔CCS水电站首部枢纽地形地质条件复杂,基础处理是首部枢纽设计的重点和难点,也是总承包项目工期及投资的关键控制点。针对冲沙闸地层条件特征,提出采用素混凝土桩复合地基处理方案,笔者对设计方案进行了详细介绍。目前,冲沙闸已建成两年且运行正常,监测结果表明冲沙闸基础界面应力基本稳定,在允许基础承载力范围内。

Due to complex topographical and geological conditions of head works of Coca Codo Sinclair Hydropower Station in Ecuador, foundation treatment is the important and difficult point in the design of headworks; meanwhile, it is also the critical control point in the construction period and investment of the EPC project. Treatment scheme of composite foundation of plain concrete pile is adopted based on the stratum conditionsand characteristics of flushing sluice, and the detailed design scheme is presented in this paper. The flushingsluice, which was completed two years ago, has been operating under normal condition. The monitoring resultshows that interfacial stress of flushing sluice foundation is basically stable within the range of allowable foundation bearing capacity.