| 土层结构对非饱和毛细水盐运移的影响 |
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| 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. |
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| 作者姓名： | 吕擎峰 单小康 赵彦旭 贾博博 杲斐 |
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| 作者单位： | 1.兰州大学土木工程与力学学院，甘肃 兰州 730000 |
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| 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） |
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| 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SO_4~(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。
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| 关 键 词： | 土层结构 毛细作用 水盐运移 土柱试验 |
| 收稿时间： | 2020-09-01 |
Influence of soil layer structure on unsaturated capillary water and salt transport |
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| Institution: | 1.College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, China2.Power China Zhongnan Engineering Corporation Limited, Changsha, Hunan 410000, China3.China Railway 21st Bureau Group Co., Lanzhou, Gansu 730050, China |
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| Abstract: | The discontinuity of pore structure and hydraulic properties between layered soils has a significant influence on the transportation of water and salt. Based on the field investigation, the laboratory soil column tests of two soil layer binary structure combinations (loess-sandy silt and loess-silty clay) were designed. Through the model tests, the influence of soil layer structure on capillary water distribution and salt accumulation under different groundwater supply conditions was discussed. The test results show that under the condition of capillary water supply, the upper-fine and lower-coarse soil layer structure composed of loess-sandy silt is beneficial to capillary water and salt transportation. After 60 days of evaporation, the surface content of the upper-fine and lower-coarse soil column is twice of the upper-coarse and lower-fine soil column. Under the condition of no capillary water supply, the total amount and rate of upward migration of water and salt in the sandy silt layer is greater than that of the silty clay layer, and finally the ion content of each of the overlying soil layer in the upper-fine and lower-coarse soil column is greater than the upper-coarse and lower-fine soil column. The research results provide experimental reference for the prevention of saline soil disease in layered soil areas. |
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