珠三角软土微观结构试验分析

土的微结构对土的力学行为机制起着至关重要的作用,对珠三角典型的软土进行单向压缩试验,利用环境扫描电子显微镜(ESEM)所得的照片研究软土在不同固结压力条件下的微结构大小、形状、定向性等微结构参数,分析其变化规律.研究表明:随着固结压力的增加,结构单元体不断变大,集合体的形状在垂直于压力的方向变长,结构单元体的定向性有所提高但不显著;孔隙分布分维呈下降趋势并逐步稳定.

Analysis on Micro-structural Characteristics of Soft Soil in PRD during Consolidation Test

Structural properties of soil had a great impact on mechanical properties of the soil. Uniaxial compression test was completed for soft soil of PRD.The use of environmental scanning electron microscope (ESEM) photos of soft soil in different pressure,to study the different micro-structural parameters including the size, shape, orientation of pores and structural units,to analyze the changes in the rules. Studies show that: with the increasing consolidational pressure, the structural units are biger constantly and the shape of aggregates in the perpendicular direction to the pressure is longer, the orientation of structural units is increased, but not significantly. Distribution dimensions of pores decline with the increasing consolidation pressure and trend to become stable.