土工基础

›› 2013, Vol. 27 ›› Issue (5): 13-15.

• 工程实录 • 上一篇    下一篇

深厚粉砂层三轴搅拌桩不返浆问题分析及处理

亓军强1，顾国荣2，梁 兵3   

  1. （1.苏州市轨道交通集团有限公司,江苏苏州 215000；2.上海岩土工程勘察院有限公司，上海 200000；3.中航勘察设计研究院有限公司，北京 100000）
  • 收稿日期:2012-12-05 出版日期:2013-10-22 发布日期:2013-10-28
  • 作者简介:亓军强（1976-），男，高级工程师，研究方向为轨道工程。

Mitigations of No Return Slurry Incident in ThreeAxisSoil Mixing in Thick Silty Soils

QI Junqiang1,GU Guorong2,LIANG Bing3   

  1. (1.Suzhou Rail Transportation Engineering Co.,Ltd.,Suzhou 215000;2.Shanghai Geotechnical Investigation Institute Co., Ltd., Shanghai 200000;3.AVIC Geotechnical Engineering Institute Co.,Ltd.,Beijing 100000)
  • Received:2012-12-05 Online:2013-10-22 Published:2013-10-28

摘要： 通过现场补充勘察及室内试验对比，对苏州某基坑围护三轴搅拌桩施工过程中出现的不返浆问题进行了分析，并对后续的施工方案进行了优化调整。试验表明，深基坑降水和施工扰动易引起周边砂土的地下水环境变化，深厚粉砂层性质发生相应变化，进而引起不返浆问题,外加剂膨润土对砂土中的返浆作用很明显,能有效提高返浆性能。

关键词: 三轴搅拌桩, 不返浆, 膨润土添加剂, 地下水

Abstract: This paper presents a case history of the mitigation of no return slurry incident in the three-axis soil mixing for a deep excavation support project in Suzhou. Throughout the exploratory soil borings and laboratory testing, it is suggested that the groundwater conditions changed during the dewatering and piling operations in the silty and sandy soils. The disturbed silty and sand soils are the main cause that resulting the no slurry returning. Adding the bentonite into the soil strata would significantly improve the returning of the slurry in the soil mixing.

Key words: ThreeAxis Soil Mixing, No Slurry Return, Bentonite Additives, Groundwater Conditions