摘要
为研究长螺旋压灌桩湿作业下水泥浆液的渗透特性,以某桩-粉质黏土过渡带为研究对象,采用扫描电子显微镜技术对地下水位以下粉质黏土层中的水泥浆液渗透区孔隙结构进行定性和定量分析,借助Image-Pro Plus (IPP)及地理信息系统(GIS)软件分析水泥浆液渗透区域的平均渗透距离、孔隙率、孔隙定向性及孔隙分形维数随深度增大的变化规律.结果表明:随着渗透区深度增加,水泥浆液渗入桩侧土体的平均距离增大,水泥水化产物对孔隙的充填作用增强,纤维状水化产物逐渐发育,胶结形成的空间网状结构范围增大;并且随着渗透区深度增加,桩侧土体孔隙率减小,小孔隙数量增加,大孔隙面积减小,孔隙定向性减弱,微观结构更加复杂.
In order to study the permeability properties of cement slurry for long auger press-grouting pile under wet condition,the characteristics of transition zones between pile silty clay from the west resettlement on the south bank of Laozhuang River,Xiaogan City,were studied.The scanning electron microscopy(SEM)was applied to qualitatively and quantitatively analyze the pore structure of the area permeated by cement slurry in the silty clay layer below the groundwater level.Using the image-pro plus(IPP)and geographic information system(GIS),the average permeating distance,porosity,pore orientation and pore fractal dimension in permeated area were investigated in terms of depth.The results show that with the increase of the penetration depth,the average distance of cement slurry infiltrating into the soil around the pile increases,and the filling effect of cement hydration products on the pore is strengthened.With the fibrous hydration products gradually developing,the spatial network structure formed by cementation would be enlarged.The porosity of the soil around the piles decreases while the number of small pores increases,and the area of large pores and the pore orientation decrease.The microstructure of pores would become more complicated.
作者
高睿
俞皓
蔡桦
邓畅
GAO Rui;YUHao;CAI Hua;DENG Chang(School of Civil Engineering,Wuhan University,Wuhan 430072,China;Hubei Provincial Key Laboratory of Safety for Geotechnical and Structural Engineering,Wuhan University,Wuhan 430072,China;Central South Survey Design Institute Group Co.Ltd.,Wuhan 430071,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第6期101-106,132,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51878521)。
关键词
长螺旋压灌桩
扫描电子显微镜
平均渗透距离
孔隙
水化产物
long auger press-grouting pile
scanning electron microscopy(SEM)
average permeation distance
pore
hydration products
