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土层结构对非饱和毛细水盐运移的影响

吕擎峰 单小康 赵彦旭 贾博博 杲斐

吕擎峰, 单小康, 赵彦旭, 贾博博, 杲斐. 土层结构对非饱和毛细水盐运移的影响[J]. 中国地质灾害与防治学报, 2021, 32(4): 99-105. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-13
引用本文: 吕擎峰, 单小康, 赵彦旭, 贾博博, 杲斐. 土层结构对非饱和毛细水盐运移的影响[J]. 中国地质灾害与防治学报, 2021, 32(4): 99-105. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-13
Qingfeng LYU, Xiaokang SHAN, Yanxu ZHAO, Bobo JIA, Fei GAO. Influence of soil layer structure on unsaturated capillary water and salt transport[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 99-105. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-13
Citation: Qingfeng LYU, Xiaokang SHAN, Yanxu ZHAO, Bobo JIA, Fei GAO. Influence of soil layer structure on unsaturated capillary water and salt transport[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 99-105. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-13

土层结构对非饱和毛细水盐运移的影响

doi: 10.16031/j.cnki.issn.1003-8035.2021.04-13
基金项目: 国家自然科学基金项目(51878322);甘肃省科技重大专项(19ZD2FA001);中国铁建研发计划项目(2019-B08)
详细信息
    作者简介:

    吕擎峰(1971-),男,甘肃白银人,博士,教授,主要从事岩土工程方面的研究。E-mail:lvqf@lzu.edu.cn

  • 中图分类号: TU43

Influence of soil layer structure on unsaturated capillary water and salt transport

  • 摘要: 层状土层之间孔隙结构和水力学性质的不连续性对土体水盐运移有显著影响。基于现场调查,设计了两种不同粒径土层二元结构组合(黄土-砂质粉土和黄土-粉质黏土)的室内土柱试验,通过模型试验讨论了不同地下水补给条件下土层结构对毛细水分布和盐分累积的影响。试验结果表明:在毛细水补给条件下,黄土-砂质粉土构成的上细下粗型土层结构有利于毛细水盐运移,经过60 d蒸发后,其表层${\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$含量是上粗下细型土柱的两倍。在无毛细水补给条件下,砂质粉土层中水盐向上迁移总量和迁移速率大于粉质黏土层,最终上细下粗型土柱中上覆土层各层位离子含量均大于上粗下细型土柱。研究结果为层状土区盐渍土病害的防治提供了试验参考。
  • 图  1  上拱变形处土层结构与水盐垂直分布图

    Figure  1.  The soil layer structure and water-salt distribution in heave site

    图  2  未上拱变形处土层结构与水盐垂直分布图

    Figure  2.  The soil layer structure and water-salt distribution in contrast site

    图  3  试验装置

    Figure  3.  Test apparatus

    图  4  试验土样的粒径分布曲线

    Figure  4.  Grain-size distribution curves of soil samples

    图  5  毛细水补给土柱含水率沿深度分布

    Figure  5.  Distribution of water content along depth with capillary water supply

    图  6  三种土层的土水特征曲线

    Figure  6.  Soil-water characteristic curves of three kinds of soil layers

    图  7  毛细水补给土柱60 d离子分布情况

    Figure  7.  Ions distribution on the 60th day with capillary water supply

    图  8  毛细水补给土柱60 d表层积盐情况

    Figure  8.  Surface salt accumulation on the 60th day with capillary water supply

    图  9  无毛细水补给土柱含水率沿深度分布曲线

    Figure  9.  Distribution of water content along depth without capillary water supply

    图  10  无毛细水补给土柱60 d离子分布情况

    Figure  10.  Ions distribution on the 60th day without capillary water supply

    图  11  无毛细水补给土柱60 d表层积盐情况

    Figure  11.  Surface salt accumulation on the 60th day without capillary water supply

    表  1  试验组设计

    Table  1.   Test group design

    土柱编号ΙAIBⅡAⅡB
    上覆土层黄土黄土黄土黄土
    下伏土层砂质粉土粉质黏土砂质粉土粉质黏土
    隔断层标准砂层标准砂层卵砾石层卵砾石层
    下载: 导出CSV

    表  2  试验土样的物理性质

    Table  2.   Physical properties of soil samples

    土样液限/%塑限/%塑性指数最大干密度/(g·cm−3最优含水率/%
    黄土27.218.2 9.01.8015.0
    砂质粉土21.413.5 7.92.0012.0
    粉质黏土30.619.511.11.7317.0
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-09-01
  • 修回日期:  2020-10-10
  • 网络出版日期:  2021-10-11
  • 刊出日期:  2021-08-25

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