广州软土固结过程微观结构的显微观测与分析  

MICRO-STRUCTURE OBSERVATION AND ANALYSIS OF GUANGZHOU SOFT SOIL DURING CONSOLIDATION PROCESS

作　　者：周晖[1,2] 房营光[1,2] 禹长江 

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641 [3]广东省永基建筑基础有限公司,广东广州510370

出　　处：《岩石力学与工程学报》2009年第A02期3830-3837,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：华南理工大学亚热带建筑科学国家重点实验室自主项目(2008ZA11)

摘　　要：利用环境扫描电子显微镜(ESEM)对珠三角典型的广州金沙洲软土固结过程土样的微观结构进行观测,基于观测所得的显微照片分析软土在不同固结压力下微结构的尺度、形状、定向性等微结构特征及其变化规律,并采用计算机图像处理软件定量分析软土的微孔隙率、结构单元体分布角等微结构参数随固结压力的变化规律。根据显微观测照片的分析获得随着固结压力的增加结构单元体不断变大、微孔隙率减小、垂直于固结压力方向的集合体形状增长、结构单元体的定向性有所提高以及孔隙分布分维呈下降趋势并逐步稳定等有价值的结论。Environmental scanning electron microscope（ESEM） was used to observe microstructures and their changes of soft soil samples of a typical soft soil district of PRD in consolidation test from Guangzhou Jinsha Delta.By analyzing the micrographs of soft soil obtained from consolidation test,characteristical parameters of the microstructure such as scale,shape,orientation of structural units and holes under the different consolidation pressure were obtained.At the same time,computer image processing software was used to analyze quantitatively the laws of some micro-structural parameters including microporosity,the distribution angle of the soil structural units and holes.In accordance with the analytical results from microscopic observation,some valuable conclusions were presented as follows：with the increasing consolidation pressure,the soil structural units increases constantly,microporosity decreases,and the shape of aggregates in the perpendicular direction to the pressure is longer,and the orientation of soil structural units increases and the fractal dimension of pore distribution has been a downward trend and in stability gradually.

关 键 词：土力学 广州软土 微观结构 二值化 定量分析 

分 类 号：TU411.92[建筑科学—岩土工程]