砂土层开挖的几种实用方法

Practical methods for sand soil stratum excavating

在水利工程或其它建筑的基础工程施工时，常常会遇到砂土层（细砂、粉砂），而且地下水位较高，基坑开挖深度较深等情况，往往易出现坑内涌水、边坡失稳及产生流砂现象，使得基坑开挖难以进行。根据多年工程施工经验，提出了三种实用方法；射流泵井点系统法、深井井点降水法及水枪法，实践证明：三种方法技术可行，可使工程顺利进行，经济效益显著。

With the sand soil stratum,high underground water table and deep excavated foundation pit,which are frequently encountered in the water conservancy and other projects'foundation works construction,the phenomena of the pit water yielding,slope failure and flowing sand tend to occur,resulting in difficult pit excavating.Based on long experience in the engineering construction, three practical methods for sand soil stratum excavating have been proposed:jet pump well system method,deep well water table decline method and hydraulic gun method.Applications show that three methods are all feasible in technology,easy in operation and saving in economy.