金川水电站坝基砂层透镜体震动液化评价及工程措施

Assessment and Engineering Measures for Vibration Liquefaction of Sand- Layer Lens in Dam Foundation,Jinchuan Hydropower Project

大渡河金川水电站河床覆盖层层位复杂、颗粒组成变化较大,坝基砂层透镜体天然状态下局部存在液化势。经初判、复判、Seed简化法和有限元动力计算等多种方法评价,建坝后砂层透镜体不会发生液化破坏。采取工程措施,可以确保建在深厚覆盖层上的金川大坝安全。

Location of the overburden on the riverbed is complicated in Jinehuan Hydropower Project, the overburden particle composition varies largely and the sand-layer lens in the dam foundation is with liquefaction potential in natural condition. Through assessment by methods such as primary judgment, re-judgment, Seed simplified method and finite dement dynamic computation, ete, the sand-layer lens will not result in liquefaction failure. Through the engineering measures to be taken, safety of the dam, Jinehuan Hydropower Pro- jeet, to be built on the deep and thick overburden can be assured.