目前处理流砂层基坑开挖的施工技术及方式众多,本文以江北二标小构基坑开挖遇流砂涌水为例,分析平原地区水文地质情况,流砂涌水的成因及处理措施。总结了设计使用简易井点降水结合自沉降木桩草袋围堰,处理平原富水地区流砂层大基坑开挖的关键施工技术,希望对类似不良地质条件下基坑开挖有所参考。 At present, there are many construction techniques and ways to deal with the excavation of the drift sand foundation pit. This article takes the case of sand flow in the case of excavation and excavation of a small foundation pit in the Jiangbei No.2 submarine as an example to analyze the hydrogeological conditions in the plain area, the causes of the gushing sand gushing water and the treatment measures. This paper summarized the key construction techniques for designing excavation of large foundation pit of quicksand layer using simple well point precipitation in combination with self-settling stakes grass-bag cofferdam, hoping to make reference to the excavation of foundation pit under similar unfavorable geological conditions.