白宝军，郭欧，赖忠群，金元明，周洁芳，孙建荣，郑欧钊，Kui PY - 2020 DA - 2020/05/26 TI -粒径和溶液淋滤对离子吸附稀土SP - 4921807 VL - 2020 AB -土-水特征曲线反映非饱和土体的持水行为。粒径和矿物组成对土壤质量的持水行为有显著影响。为探讨粒径和溶液浸出对离子吸附稀土保水性的影响，采用压力板仪对不同粒径的样品进行了溶液浸出前后的土-水特性测试。分析了干湿过程中土壤水分特征曲线。采用Fredlund&Xing 3参数模型、Fredlund&Xing 4参数模型和Van Genuchten模型对试验数据进行拟合分析，探讨不同模型下土-水特征参数的变化规律。研究了颗粒大小和溶液浸出对稀土离子吸附保水行为的影响及其作用机理。结果表明，在基质吸力相同的情况下，土壤含水量随着粒径和粗粒含量的增大而逐渐减小，土壤的持水能力随之降低。在体积含水量相同的情况下，基质吸力与粒径成反比。在干燥和润湿过程中，随粗颗粒粒径和含量的增加，变化幅度逐渐减小。 The soil water content after solution leaching is smaller than that before under the same matric suction, indicating that solution leaching can decrease water retention capacity of soil. This is mainly because thickness of the double diffuse layer and pore water pressure are increased as a response to the ion exchange, thus decreasing matric suction. SN - 1468-8115 UR - https://doi.org/10.1155/2020/4921807 DO - 10.1155/2020/4921807 JF - Geofluids PB - Hindawi KW - ER -