1　前　　言 在狭窄场地或密集建筑群中进行地下工程施工 ,需采用深基坑支护技术。在沿海和三角洲等软土地区 ,基坑围护结构应有挡土和止水双重功能 ,多数基坑开挖深度在 1 0ｍ以下。在软土地区 ,6～ 1 0ｍ基坑多采用混凝土灌注桩排桩加搅拌桩止水帷幕 ,搅拌桩止水帷幕一般为? 1 Introduction Underground construction in a narrow space or dense buildings requires the use of deep foundation pit support technology. In soft soil areas such as coastal areas and deltas, the retaining structure of foundation pit should have dual functions of retaining soil and stopping water. The excavation depth of most foundation pit should be under 10m. In the soft soil area, more than 6 ~ 10m pit using concrete pouring pile piles and mixing pile water curtain, mixing pile water curtain generally?