压汞试验技术研究黏性土微观孔隙分布特性

Experiment Study on Microscopic Pore Distribution Characteristics of Clays Based on the Mercury Intrusion Technology

土体的微观结构对土的物理力学特性具有决定性影响,研究土体微观结构有重要的科学意义.取武汉市汉街地区一处建筑工地基坑底部的非饱和粘土,风干后制得干密度为1.4g/cm3的重塑土试样,运用压汞试验方法研究试样微观孔隙结构的孔径分布变化规律.研究表明,该地区非饱和粘土孔隙主要以大孔为主,大多分布在8.75～62.5μm之间.通过试验还发现进汞曲线和出汞曲线的不一致性,并分析了产生此结果的原因.

The soil microstrueture has a significant influence on the mechanical behavior of soil, and researching on soil microstructure is important. Take some unsaturated clay of the foundation , at a construction site of Han Street in Wuhan, The dry density of the remodeling clay was controlled over 1.4g/ cm^3 , after the air drying. By means of mercury intrusion test, the study researched the shifty rule of the pore distribution in terms of microstructure. The result shows that the pore size distribution is dominant for big pore size, with the main size distribution varying from 8.75tsm to 62.5μm. Through the test, the result also shows that the intrusive mercury curve and the extrusive mercury curve is inconsistent. The reason was also analysed.