可溶盐对黄土触变性的作用效应研究

Study of effect of soluble salt on loess thixotropy

为揭示可溶盐对黄土触变性的影响程度及作用规律,以宁夏同心黄土为研究对象,以干密度、含水率、含盐量为因素,设计正交试验方案进行了黄土的触变性研究。结果表明:黄土的触变性参数随干密度和含盐量的增大而增大、随含水率的增大而减小、并且随龄期的增长而增大;各因素影响的主次顺序为含水率、干密度和含盐量。在正交试验结果分析的基础上,以含盐量为因素进行了单因素试验,发现触变性参数与含盐量呈对数关系,且有很好的相关性,可溶盐对黄土触变性的影响明显,是影响黄土触变性的重要因素之一。研究结论对黄土地基设计、施工和处理有重要的指导意义。

In order to reveal the degree and rule that the soluble salt influences the loess thixotropy, taking Ningxia Tongxin loess as the object and its dry density, water content and salinity as factors, the thixotropy of loess is studied by designing the orthogona! test scheme. The results show that thixotropic parameter of loess increases with the growth of the dry density and salinity, and decreases with the growth of the water content and increase with the growth of the age. The sequence of various factors is water content, dry density and salinity, which affect the loess thixotropy. Based on the orthogonal test results, single factor experiment is carried out with the salinity as the factor. It is found that there is a logarithm relationship between thixotropic parameter and salinity; and there is a good correlation between them. It is obvious that the soluble salt affects on the loess thixotropy, the soluble salt is one of the important factors. The conclusion will have important guiding significance on the foundation design, construction and treatment in the loess area.