南水北调中线京石段渠道工程（S22标）渠基换填壤土施工技术

The Construction Technology of Loam Back Filling in the Canal Foundation of $22 Biding in Beijing-Shijiazhuang Section of the South-to-North Water Transfer Project

南水北调中线京石段应急供水工程总干渠第S22标，起讫桩号为314＋333—318＋700，共计4367m。渠基开挖后与原勘察成果变化较大，经地质填图成果及计算边坡稳定计算分析，渠道边坡和底部分布粉砂和细砂夹层的部分渠段不能满足规范要求的安全系数。通过分析优化比较，设计采用了渠基换填壤土的施工技术。施工单位合理安排，精心施工，保障质量，达到了设计和规范要求，保证了渠基边坡和底部稳定。

The S22 bidding section of the Emergency Water Supply of Jinshi Section in the middle route of the South-to-North Water Transfer Project is from the stake number 314＋333 to 318＋700, and the length is 4367m. As excavation, it found that the foundation is different with the investigation report, After the geological mapping and slop stability calculation, it is confirmed that canal slop and some sections where there is silty and fine sand interlayers cannot satisfy the requirement of safety coefficient in the code. Through analysis, optimization and comparison to different treatment, it adopted the construction technology of loam back filling in the foundation of canal. The construction company arranged and constructed reasonably and ensured the engineering quality. Finally, it meets the requirement of design and code and ensure the stability of slop and basement of the canal,