变径双向水泥土搅拌桩施工技术  

Installation of variable diameter soil-cement double mixed column

作　　者：易耀林[1,2] 刘松玉[1] 赵玮[3] 孙鹤[3] 陈文震[3] 李汉光[3] 

机构地区：[1]东南大学岩土工程研究所,江苏南京210096 [2]Cambridge University [3]江苏省高速公路建设指挥部,江苏南京210004

出　　处：《岩土工程学报》2010年第S2期387-390,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50879011);江苏省普通高校研究生科研创新计划项目(CX08B-101Z);东南大学优秀博士学位论文基金项目(YBJJ0914)

摘　　要：为了有效处理软土层位于中间的多层软弱地基,开发了中间桩体直径扩大的变径双向水泥土搅拌桩,并通过现场试桩施工及检测,介绍了变径双向水泥土搅拌桩的施工原理、机械设备、施工工艺和桩身质量检测结果。现场试桩结果表明所提的变径水泥土搅拌桩施工工艺是合适的,能形成中间截面扩大的新型搅拌桩。由于采用了双向搅拌工艺,保证了水泥掺量,提高了搅拌均匀性,变径双向水泥土搅拌桩的桩身强度大大高于常规水泥土搅拌桩。变径双向水泥土搅拌桩的研发丰富了水泥土搅拌桩处理软弱地基的形式,能经济、有效地对中间软土层的多层地基进行针对性地的处理,具有很好的应用前景。In order to treat the multi-layered soft ground with the soft layer in the middle efficiently,the variable diameter soil-cement double mixed column is developed and the field test of column installation is introduced.The installation mechanism,deep mixing machine,column installation procedure,and column quality testing results of variable diameter soil-cement double mixed column is presented.The excavation of testing model column indicates that the proposed column installation procedure is suitable for installing the variable diameter soil-cement deep mixed column.As the double mixing technology is used,the cement content mixed in the column is ensured and the mixing uniformity is improved,thus the column strength of variable diameter soil-cement deep mixed column is much higher than that of conventional soil-cement deep mixed column.The development of variable diameter soil-cement double mixed column enriches the categories of soil-cement deep mixed column for soft ground improvement,and can improve the multi-layered soft ground with the soft layer in the middle more economically and efficiently,so it has good potential application for practice.

关 键 词：多层软弱地基 变径搅拌桩 双向搅拌 桩身质量 

分 类 号：TU753.3[建筑科学—建筑技术科学]