坝基含卵砾中粗砂振冲加密试验与施工

大隆水利枢纽工程坝基是在上下游戗堤间填砂而成的，填砂的主要成分为含卵砾中粗砂，其特点是卵砾石粒径大、含量高。原河床上部平均5m地层结构松散，均需采用振冲加密法进行处理，才能达到设计要求的密实度。文中介绍了该工程振冲试验以及在振冲加密施工中采用的施工技术措施、检测标准和检测效果。

Experiment and construction techniques for vibroflotation compaction of medium-coarse sand with gravel in dam foundation

The foundation of Dalong Water Control Project is constructed with the method of filling sand between upstream and downstream berms ; of which the filled sand mainly consists of the medium-coarse sand with high content and large size graveL The structure of the stratum with the thickness of about 5 m above the original riverbed is quite loose and then has to be treated by the vibroflotation compaction, so as to meet the compactness required by the design. Therefore, the experiment on the vibroflotation and the construction techniques, testing standards and effects concerned for the project are described herein.