土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (6): 711-714.

• 测试技术 • 上一篇    下一篇

EHP桩渗透特性试验研究

冯 英1，肖 艳2，吉 锋3，宋苗苗4，翁佳兴5   

  1. （1.淮河水利水电开发有限公司，安徽蚌埠 233000；2.淮委治淮工程建设管理局，安徽蚌埠 233001；
    3.南水北调东线江苏水源有限责任公司，南京 210029；4.盐城工学院土木工程学院，江苏盐城 224051；
    5.江苏鸿基水源科技股份有限公司，江苏扬州 225002）
  • 收稿日期:2019-11-29 修回日期:2019-12-10 出版日期:2020-12-30 发布日期:2020-12-25
  • 通讯作者: 宋苗苗（1987-），女，讲师，研究方向为软土地基处理。
  • 作者简介:冯 英（1976-），男，高级工程师,研究方向为软土地基处理。
  • 基金资助:
    国家自然科学基金项目（51808481,51978597）；淮河水利委员会治淮工程项目（HGBF-QT-41）

Experimental Study of the Permeability Characteristics of EHP

FENG Ying1, XIAO Yan2, JI Feng3, SONG Miaomiao4， WENG Jiaxing5   

  1. (1.Huaihe Water Conservancy and Hydropower Development Company, Bengbu 233000;
    2.Huaihe Committee Huaihe Project Construction Administration Bureau, Bengbu 233001;
    3.The Eastern Route of SouthtoNorth Water Diversion Project Jiangsu Water Resource Co. Ltd., Nanjing 210029;
    4.School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051;
    5.Jiangsu Hongji Water Resource Technology Co. Ltd.,Yangzhou 225002)
  • Received:2019-11-29 Revised:2019-12-10 Online:2020-12-30 Published:2020-12-25

摘要： 基于传统水泥土搅拌施工工艺，提出了一种环境友好的均质水泥土搅拌桩（environmental homogeneous cementsoil mixing pile, EHP桩）施工工艺。为明确改进施工工艺制备桩体的抗渗性能，对现场取回芯样和室内制备水泥土试样开展了渗透试验和扫描电镜试验，基于试验结果分析了加固深度、水泥掺量、养护环境等对EHP桩渗透性状的影响。结果表明：EHP桩的渗透系数沿桩身深度基本呈均匀分布，渗透系数随着水泥掺量和龄期的增加不断降低，但整体降幅较小。现场养护EHP桩的渗透系数普遍大于室内标准养护水泥土，但随着水泥掺量增加二者间差异逐渐减小。

关键词: EHP桩, 渗透系数, 龄期, 水泥掺量, 养护环境

Abstract: The Environmental Homogeneous Cementsoil Mixed Pile (EHP) is a new type of cementsoil mixing pile developed from the conventional installation of soilcement mixed pile. The soilcement samples were prepared in field and laboratory, respectively. A series of permeability tests and Scanning Electronic Microscope (SEM) tests were conducted on the mixtures to investigate the effects of reinforced depth, cement content and curing environment on the permeability of EHP. The results indicate that hydraulic conductivity of EHP keeps almost unchanged with increase in the depth. The increase in the cement content and sample curing time induce a reduction in the permeability of cement soil although the overall decrease is small. For samples cured under the standard conditions, the values of permeability are usually larger that than cured in the field. But the difference in the permeability of samples cured under different environment, would decrease with the increase in the cement content.

Key words: EHP, Permeability, Curing Time, Cement Content, Curing Environment

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