近年来,我国沿海地区防洪能力在不断提高。防洪工程多分布于具有高灵敏度、高压缩性、低强度等特点的软弱基础之上,施工过程中,若处理不当,就易发生局部甚至整体失稳。文章结合浙江瑞安城市防洪堤三期工程,分析沿海地区复杂地质条件下进行水下钻孔灌注桩作业的施工要点和质量控制手段以及施工过程中的常见问题和防治措施,为类似工程作业提供有效参考。 In recent years, the flood control capability of coastal areas in our country has been continuously improved. Flood control projects are mostly distributed on the basis of weakness characterized by high sensitivity, high compressibility and low strength. In the process of construction, if they are not handled properly, partial or even global instability will easily occur. Based on the third phase project of Ruian urban flood control embankment in Zhejiang Province, this paper analyzes the construction essentials and quality control measures of underwater bored piles under complicated geological conditions in the coastal area as well as the common problems and prevention measures in the construction process, and provides effective measures for similar projects reference.