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类毛细导水材料排水及抑制土体冻融效果研究
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作者单位:

1.东南大学 交通学院;2.吉林省高等级公路建设局

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国家自然科学基金资助项目(41877240,41672280);吉林省交通运输科技项目(2016-1-16-2);东南大学2018年实践创新计划(3221009745)。


Study on Drainage performance of quasi wicking fabric and its control effect on freezing and thawing of soil samples
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1.Southeast University;2.Jilin Provincial High Class Highway Construction Bureau

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    摘要:

    为解决季节性冻土地区路基土中水分积累引起路基冻害问题,以商用高岭土为对象,通过对使用类毛细导水材料处理后的高岭土单元试样分别进行排水和冻融试验,研究类毛细导水材料排水及抑制土体冻胀的效果。结果表明,类毛细导水材料可以在土体非饱和条件下将其中水分排出,使土样中水分含量降低20%~30%;类毛细导水材料包裹试样侧面时的排水效果优于将其埋设于试样中,且试样初始含水率越大,类毛细导水材料的排水性能发挥越充分;冻融试验中,土样初始含水率越高,其冻胀量和融沉量也就越大,类毛细导水材料能够使土样在冻胀融沉过程中的体积变化率减少5%~15%,从而有效抑制土体冻害。

    Abstract:

    To solve the problems of stability and frost damage problems of road embankment caused by moisture accumulation in subgrade in seasonal frozen soil area, drainage and freeze-thaw tests were carried out on kaolinite soil samples with different initial water content and quasi wicking fabric. It’s aimed to study the drainage performance of quasi wicking fabric and its control effect on frost heaving of soils. Test results indicate that the quasi wicking fabric can discharge water from unsaturated soil and reduce the moisture content of soil sample by 20%~30%. The drainage effect of the condition that soil sample is laterally wrapped by wicking materials is better than that the material is placed inside the sample. As the initial water content of the sample increases, the drainage performance of the quasi wicking fabric also becomes more effective. In the freeze-thaw test, frost heave and thaw settlement increases with the initial water content of the soil sample. The quasi wicking fabric can effectively reduce the volume change of the soil sample during freeze-thaw process by 5%~15%, which thereby can inhibit the frost damage of the soil.

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历史
  • 收稿日期: 2019-08-24
  • 最后修改日期: 2020-01-18
  • 录用日期: 2020-01-21
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