固化吹填土的渗透性及其分形维数的定量研究  

Quantitative Analysis of the Relationship between Permeability and Fractal Dimension of Solidified Dredger Fill

作　　者：刘宏伟[1] 刘文白[1] 崔勇涛[1] 郭筱筱 

机构地区：[1]上海海事大学海洋科学与工程学院,上海201306

出　　处：《科学技术与工程》2017年第13期60-65,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51078228);国家海洋公益性行业科研专项经费(201105024-5);上海海事大学研究生创新基金(2016ycx025)资助

摘　　要：为了研究固化吹填土的渗透性与分形维数之前的关系,采用自配固化剂对上海横沙岛东滩吹填土进行固化,对不同养护时间和不同固化剂含量的吹填土进行室内渗透试验和电镜扫描试验得到固化吹填土的渗透系数和微观图像。通过相应的图像分析处理软件对固化吹填土的微观图像进行处理和分析,运用分形理论得出固化吹填土的粒度分维D_(ps)、孔径分维D_(bs)和颗粒定向分维D_(di),对固化吹填土的渗透性及其微观分形维数之间的关系进行定量分析。研究表明:吹填土在固化过程中,粒度分维逐渐减小、孔径分维和颗粒定向分维逐渐增大,粒度分维D_(ps)、孔径分维D_(bs)和颗粒定向分维D_(di)与固化剂掺量λ和龄期T密切相关;粒度分维D_(ps)越小、孔径分维D_(bs)和颗粒定向分维D_(di)越大,固化吹填土的渗透性越低;渗透系数k与三种分形维数具有很好的线性关系,相关系数R^2都在0.95以上。In order to study the relationship between permeability and fractal dimension of solidified dredger fill,the dredger fill of Shanghai Hengsha island Dongtan was solidified by self-made curing agent,and the permeability of solidified dredger fill was measured by the indoor penetration test. The microstructure of the solidified dredger fill and unsolidified dredger fill was observed by using scanning electron microscope( SEM). The microscopic image of dredger fill was processed and analyzed by using image analysis software,and the fractal dimensions were calculated that include the particle size fractal dimension D_(ps),pore size fractal dimension D_(bs),particle orientation fractal dimension D_(di)by using fractal theory. The Quantitative analysis of the relationship between permeability and fractal dimension of Solidified dredger fill was done. The research results show that: in the solidification process, the particle size fractal dimension is gradually reduced,and the pore size fractal dimension and the particle orientation fractal dimension is gradually increased. The particle size fractal dimension D_(ps),pore size fractal dimension D_(bs),particle orientation fractal dimension D_(di)are closely related to the content of the curing agent and the age of curing. The smaller the particle size fractal dimension D_(ps),the larger the pore size fractal dimension D_(bs)and the particle orientation fractal dimension D_(di),the lower the permeability of solidified dredger fill. The permeab coefficient k has a good linear relationship with the three fractal dimensions and the correlation coefficient R^2 are all above 0. 95.

关 键 词：固化吹填土 渗透性 分形维数 电镜扫描 

分 类 号：TU441.31[建筑科学—岩土工程]