土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (3): 265-268.

• 工程实录 •    下一篇

湿陷性黄土地区CFG桩施工工艺应用分析

满朝晖1，杨丽娜2，张小辉3   

  1. （1.中国煤炭科工集团西安研究院有限公司，西安 710077；2.西安高新科技职业学院，西安 713700；3.机械工业勘察设计研究院有限公司，西安 710043）
  • 收稿日期:2019-06-25 修回日期:2019-07-13 出版日期:2020-06-20 发布日期:2020-06-20
  • 作者简介:满朝晖（1988-），男，工程师，研究方向为地基处理与基坑支护等项目管理。

Application of CFG Column Method in Collapsible Loess Improvement

MAN Chaohui1, YANG Lina2, ZHANG Xiaohui3   

  1. (1.Xi’an Research Institute, China Coal Technology & Engineering Group Co. Ltd., Xi’an 710077；
    2.Xi’an Hightech Vocational College, Xi’an 713700；
    3.Xi’an Investigation and Design Research Institute, China National NonFerrous Metals Industry, Xi’an 710043)
  • Received:2019-06-25 Revised:2019-07-13 Online:2020-06-20 Published:2020-06-20

摘要： 论述CFG桩复合地基处理湿陷性黄土的作用机理，结合工程实例,分析工程地质特点及加固效果,采用长螺旋钻孔灌注成桩施工工艺，针对施工中存在的问题，对施工工艺进行了优化。土工试验及地基检测结果表明,CFG复合地基承载力和沉降变形均满足设计要求，可以较低的成本消除黄土湿陷性并提高地基承载力，同时，优化后的长螺旋钻孔灌注成桩施工工艺也很好的解决了施工中遇到的问题，取得了很好的社会效益和经济效益，可为同类工程提供借鉴。

关键词: 湿陷性黄土, CFG桩, 长螺旋钻孔灌注桩, 施工工艺

Abstract: The treatment of collapsible loess foundation has always been an engineering challenge. The working mechanism of the Cement Flyash Gravel (CFG) column composite foundation for the ground improvement of collapsible loess is demonstrated by the brief discussion of the role of CFG columns strengthening the collapsible loess. This paper also presents a case history of installing CFG column in collapsible loess soils using a long flight auger. The installation methods are discussed with problem solving on the site-specific subsurface conditions. Both laboratory and the field quality assurance test results indicate that the bearing capacity and the deformation are met the design requirements. The CFG column is a cost-effective solution in the ground improvement of collapsible loess soils.

Key words: Collapsible Loess, Cement Flyash Gravel Columns, Cast-in-Place Concrete Pile by Long-Flight Auger, Construction Technique

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