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水力梯度对黏土渗透性影响的试验研究

宋林辉, 黄强, 闫迪, 梅国雄

宋林辉, 黄强, 闫迪, 梅国雄. 水力梯度对黏土渗透性影响的试验研究[J]. 岩土工程学报, 2018, 40(9): 1635-1641. DOI: 10.11779/CJGE201809009
引用本文: 宋林辉, 黄强, 闫迪, 梅国雄. 水力梯度对黏土渗透性影响的试验研究[J]. 岩土工程学报, 2018, 40(9): 1635-1641. DOI: 10.11779/CJGE201809009
SONG Lin-hui, HUANG Qiang, YAN Di, MEI Guo-xiong. Experimental study on effect of hydraulic gradient on permeability of clay[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(9): 1635-1641. DOI: 10.11779/CJGE201809009
Citation: SONG Lin-hui, HUANG Qiang, YAN Di, MEI Guo-xiong. Experimental study on effect of hydraulic gradient on permeability of clay[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(9): 1635-1641. DOI: 10.11779/CJGE201809009

水力梯度对黏土渗透性影响的试验研究  English Version

基金项目: 国家自然科学基金面上项目(51578164,41472283); 江苏省博士后基金项目(2017087B)
详细信息
    作者简介:

    宋林辉(1980- ),男,博士,副教授,主要从事岩土力学方面的研究工作。E-mail:h27991@163.com。

  • 中图分类号: TU411

Experimental study on effect of hydraulic gradient on permeability of clay

  • 摘要: 渗透性是土体的重要工程性质之一,其受孔隙率、颗粒粒径及流体性质等诸多因素影响,但通常认为与水力梯度无关。现采用研制的刚性壁固结渗透装置,对经不同固结压力固结的黏土试样,进行先逐级施加水压、后逐级卸除水压条件下的固结和渗透试验。试验结果表明,水压加载时,受渗透力的影响,孔隙比和渗透系数均随水力梯度增大而减小,理论分析验证了递增水力梯度下渗透系数测试值变化趋势的合理性。水压卸载时,孔隙比不变,但渗透系数随水力梯度减小而继续减小,主要与颗粒堵塞和弱结合水相关,水力梯度较大时弱结合水处于流动状态,水力梯度递减后,弱结合水处于黏滞状态,孔隙导水能力下降,渗透系数降低,基于试验数据的线性拟合式显示降幅可达初始值的一半。
    Abstract: Permeability is one of the important properties of soil, which is affected by many factors such as porosity, particle size and fluid properties. However, the permeability is generally considered to be independent of hydraulic gradient. By means of the newly developed rigid wall seepage device, the consolidation and permeability tests on clay samples subjected to different consolidation pressures are carried out under the condition of first gradually loading hydraulic pressure and then gradually unloading hydraulic pressure. The results show that the void ratio and permeability coefficient decrease with the increase of the hydraulic gradient for the loaded tests. It can be found that the effective stress of the samples increases after consolidation by seepage force. The theoretical analysis verifies the rationality of the trend of permeability coefficient under increased hydraulic gradient. For the unloaded tests, the void ratio keeps constant, while the permeability coefficient continues to decrease with the decrease of the hydraulic gradient. This phenomenon is related to particle plugging and weak bound water. The larger hydraulic gradient makes the weak bound water flow. With the decrease of the hydraulic gradient, the weak bound water is in the viscous state, which leads to the decrease of pore water conductivity and the decrease of the permeability coefficient. The linear fitting based on the test data shows that the loss in the permeability coefficient can reach half of the initial value.
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出版历程
  • 收稿日期:  2017-05-23
  • 发布日期:  2018-09-24

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