三轴击实试样的土-水特征曲线分布

Distribution of Soil-water Characteristic Curves of Impacted Silty Clay Triaxial Samples

测量了某重塑粉质粘土三轴击实试样在脱水条件下的土-水特征曲线,并对其特点进行了分析比较。三轴击实试样下部的土-水特征曲线(SWCC)和上部的SWCC都具有一般SWCC的典型特点,但前者较后者明显右移;结合层的SWCC有一定幅度下移;受三轴击实试样制作过程影响,较密实的下部区段具有较高的进气值和较高的残余含水量,而且,沿试样高度不同,持有不同残余含水量的各区段对应的基质吸力基本相同。

The impacted triaxial samples made from silty clay were cut into five different sections along length. With axial translation technology applied, Tempe apparatus was employed to measure water content of the sections in different matric suction levels in dewatering condition. Therefore, soil-water characteristic curves （SWCC） of different sections could be obtained. The primary conclusions drawn from the test results were list as follows. Firstly, SWCCs of all sections, including from upsides and downsides of triaxial samples, distinctly had the general traits. Determined by layer impacting, the SWCCs of downsides were dextroposition relative to the SWCCs of upsides. Secondly, the SWCCs of binder courses move downwards in some sort and this probably comes from layer impacting and scraping effect. Thirdly, comparing with upside sections, downside sections had higher air entry values, higher residual water contents and almost same matric suction corresponding to their different residual water content.