基于孔隙特征的天津滨海软粘土微观结构研究

Microstructure Research Based on Pore Characteristic of Soft Clay in Tianjin Binhai New District

摘要:

利用真空冷冻干燥法，制得天津滨海新区软土不同固结压力下代表性样品，并利用扫描电子显微镜(SEM)对样品进行扫描观察.在此基础上系统地分析了样品SEM图像在不同固结压力下孔隙结构参数的变化规律及运用平面分形维数Dp对样品不同固结压力下土中孔隙分布状况的整体性、平均性进行了分析，且提出能够综合反映土中孔隙的大小、形态、分布、定向性等微观特征的结构性参数孔隙结构因子(pore structure factor).分析表明，土体内部孔隙的结构性参数与外部荷载之间有着良好的对应关系，在结构屈服压力前后，土体内部孔

Abstract:

Representative sample of soft soil in Tianjin Binhai new district under different consolidation pressures are made by chill-sublimating and SEM(scanning electron microscopy).The change of pore structure parameter of sample SEM images under the applied consolidation stress level is systematically analyzed and the integrity and average equitability of pore distribution is studied with the simple plane fractal (Dp),and Pore Structure Factor (PSF) is presented which can reflect the scale,shape,distribution,orientation of pore.The research indicates that there is a fine corresponding relationship between structural parameters of internal pore and external loading.The internal characteristics of void are quite different before and after structural yielding pressure.