摘要
长江沿岸淤泥质土分布广泛、厚度大,承压水水位高,工程地质条件复杂,深基坑工程维护施工困难。文章结合南京青奥线梅子洲过江通道接线工程,对深基坑SWM三轴搅拌桩围护结构进行了系统研究;通过现场试桩与室内试验相结合,确定了水灰比、水泥用量、下钻速度、提升速度等主要施工工艺参数;并结合现场试验结果,研究分析了SMW工法桩围护结构的位移规律。工程实践表明,SMW工法桩围护结构在该工程地质条件下支护效果良好,对大型深基坑围护结构施工具有借鉴意义。
Along the Yangtze River,it is challenging to construct a deep foundation pit due to widely distributed and thick muddy soil,a high confined water level,and complex geological conditions.In this paper,based on the Meizizhou river-crossing passage of the Nanjing YOG transportation axis project,a tri-axial soil-mixing pile retaining structure constructed using the SMW method is studied systematically.By combining data from the field piling test and the laboratory experiment,main construction technology parameters,like water cement ratio,cement content,drilling speed,and lifting speed,are determined and the displacement law of the SMW retaining structure is analyzed in light of field test results.Engineering practices show that the SMW retaining structure has a good supporting effect under the above geological conditions,and this paper provides a reference for the construction of retaining structures for large-scale,deep foundation pits.
出处
《现代隧道技术》
EI
北大核心
2014年第5期180-185,共6页
Modern Tunnelling Technology
关键词
深基坑
SMW工法
三轴搅拌桩
围护结构
Deep foundation pit
SMW construction method
Tri-axial mixing pile
Retaining structure