深基坑全封闭防水技术

深基坑全封闭防水设计,采用钢筋混凝土地下连续墙、止水型钢、高压止水旋喷桩及空心和实心桩相结合的基坑封底措施,适用于地下水丰富且基坑降水困难或降水对周边建筑物安全存在较大影响的非降水深基坑开挖。本文结合北京市南水北调配套工程东干渠工程,详细介绍了全封闭防水设计的特点及技术方案,可供类似工程参考。

Full-enclosed water proof design of deep foundation pit

So far as the full-enclosed water proof design of deep foundation pit is concerned，the bottom sealing measures combined with the reinforced concrete diaphragm wall，the water-stop section steel，high-pressure rotary jet grouting pile for water-stop，hollow and solid piles are adopted，thus it is suitable for the excavation of the non-dewatered deep foundation pit with rich groundwater that is difficult to be dewatered or has larger impact on the safeties of the surrounding structures. In combination with the project of the ancillary works to the South-to-North Water Transfer Project——the East Main Canal，the characteristics and technical scheme of the full-enclosed water proof design is described herein in detail，so as to provide reference for the similar projects in the days to come.