EHP桩渗透特性试验研究  

Experimental Study of the Permeability Characteristics of EHP

作　　者：冯英 肖艳[2] 吉锋 宋苗苗 翁佳兴 FENG Ying;XIAO Yan;JI Feng;SONG Miaomiao;WENG Jiaxing(Huaihe Water Conservancy and Hydropower Development Company,Bengbu 233000;Huaihe Committee Huaihe Project Construction Administration Bureau,Bengbu 233001;The Eastern Route of South-to-North Water Diversion Project Jiangsu Water Resource Co.Ltd.,Nanjing 210029;School of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051;Jiangsu Hongji Water Resource Technology Co.Ltd.,Yangzhou 225002)

机构地区：[1]淮河水利水电开发有限公司,安傲蚌埠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

出　　处：《土工基础》2020年第6期711-714,共4页Soil Engineering and Foundation

基　　金：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)。

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。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.

关 键 词：EHP桩 渗透系数 龄期 水泥掺量 养护环境 

分 类 号：TU411[建筑科学—岩土工程]