Effect of soluble salt content on water-holding characteristics of Ili loess
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摘要: 新疆伊犁河谷地区黄土与黄土高原黄土有较大的区别,主要表现为成因不同、湿陷性异常强烈、易溶盐含量高。对伊犁黄土工程性质的研究,是黄土力学发展和“一带一路”建设的需要。用离心机法开展了不同易溶盐含量下伊犁黄土的持水特性试验,对比了伊犁黄土和黄土高原黄土持水特性的差异,并对土水特征曲线进行了拟合分析,在Gardner模型的基础上提出了考虑易溶盐含量的土水特征曲线模型。研究结果表明：易溶盐含量对基质吸力有一定的影响;基质吸力的变化主要发生在边界效应区和过渡区;相较与同密度的黄土高原黄土,伊犁黄土在高饱和段持水能力增强,随着饱和度的减少,二者土水特征曲线趋于一致。Abstract: The loess in Ili valley region of Xinjiang have great differences from that in Loess Plateau, mainly characterized by different causes, strong collapsibility and high soluble salt content. The researches on the engineering properties of Ili loess are the need for the development of loess mechanics and the building of Belt and Road. The water-holding characteristics of Ili loess under different soluble salt contents are studied by centrifuge modeling. The water-holding characteristics of Ili loess and Loess Plateau are compared, and the soil water characteristic curves are fitted and analyzed. Based on the Gardner model, a soil water characteristic curve model with soluble salt content is proposed. The results indicate that the content of soluble salt has a certain influence on the matrix suction. The change of matrix suction mainly occurs in the boundary effect zone and transition zone. Compared with Loess Plateau loess with the same density, Ili loess has strong water-holding capacity under high saturation, and with the decrease of saturation, the soil water characteristic curve tends to be consistent.
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Keywords:
- Ili loess /
- soluble salt content /
- soil water characteristic curve /
- fitting model /
- matrix suction
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