不同含盐量及离子含量对土的界限含水率的影响规律研究

Research on Influence Laws of Different Salt Content and Ion Content to Boundary Moisture Content of Soil

土中含盐量影响土的物理力学性能,研究细粒土中总盐含量及不同离子含量(硫酸盐和氯盐)对认识土的界限含水率的影响规律有重要意义。人工配制不同含盐量、不同离子含量的土样,测定土的界限含水率,并运用投影寻踪回归分析方法研究含盐量对土的界限含水率的影响。研究结果表明:加氯化钠时,随着含盐量的增加,土的液、塑限均有下降;加硫酸钠时,随着含盐量的增加,土的液、塑限均有上升,体积发生变化,出现膨胀现象;各加一半时,随着含盐量的增加,土的液限明显下降,塑限变化不大。

The influence laws of the total salt content and different ion content（sulfate and chlorine salt） in fine-grained soil to the boundary moisture content of the soil are studied here in detail.Through artificially making the soil samples with different salt content and ion content,the boundary moisture content of the soil is determined,and the influence of salt content on the boundary moisture content of the soil is studied by using projection pursuit regression analysis method.It is found by analysis that when adding sodium chloride,the hydraulic limit and plastic limit of the soil are decreased with salt content increasing,and when adding sodium sulfate,the hydraulic limit and plastic limit of the soil are risen with salt content increasing.At the same time,when size changing,there appears expand phenomenon.When adding each half of the sodium chloride and sodium sulfate,the hydraulic limit of the soil is dropped obviously,and the plastic limit of the soil is changed a little with salt content increasing.