张永浩, 许肖锋, 刘勇, 司高华, 王青海. 2018: 含水率对非饱和黏土渗透与弥散特性及核素迁移的影响研究. 工程地质学报, 26(s1): 657-664. DOI: 10.13544/j.cnki.jeg.2018204
    引用本文: 张永浩, 许肖锋, 刘勇, 司高华, 王青海. 2018: 含水率对非饱和黏土渗透与弥散特性及核素迁移的影响研究. 工程地质学报, 26(s1): 657-664. DOI: 10.13544/j.cnki.jeg.2018204
    ZHANG Yonghao, XU Xiaofeng, LIU Yong, SI Gaohua, WANG Qinghai. 2018: INFLUENCE OF WATER CONTENT ON PERMEABILITY AND DISPERSION CHARACTERISTICS OF UNSATURATED CLAY AND RADIONUCLIDE MIGRATION. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 657-664. DOI: 10.13544/j.cnki.jeg.2018204
    Citation: ZHANG Yonghao, XU Xiaofeng, LIU Yong, SI Gaohua, WANG Qinghai. 2018: INFLUENCE OF WATER CONTENT ON PERMEABILITY AND DISPERSION CHARACTERISTICS OF UNSATURATED CLAY AND RADIONUCLIDE MIGRATION. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 657-664. DOI: 10.13544/j.cnki.jeg.2018204

    含水率对非饱和黏土渗透与弥散特性及核素迁移的影响研究

    INFLUENCE OF WATER CONTENT ON PERMEABILITY AND DISPERSION CHARACTERISTICS OF UNSATURATED CLAY AND RADIONUCLIDE MIGRATION

    • 摘要: 基于拟建某低中放废物处置单元的包气带地质环境,研究了该区黏土材料在非饱和条件下的渗透系数K()和弥散系数D()随黏土体积含水率的变化特征。研究显示,在非饱和状态下,当体积含水率 25%时,黏土实际处于不透水状态;当 15%时,的微小变化,即可导致黏土非饱和渗透系数K()发生数量级的改变。实验表明,非饱和黏土弥散系数随着体积含水率的降低而减小,当体积含水率=38%时,实测弥散系数为4.12 m2 a-1;当=6%时,弥散系数为0.04m2 a-1,仅为前者的1%左右。核素迁移模拟结果显示,当体积含水率 25%时,钚在黏土屏障中不发生显著迁移;当 30%时,核素迁移作用明显增强。

       

      Abstract: In view of the aeration zone of a future low and intermediate radioactive waste repository, variations on unsaturated permeability coefficient K() and dispersion coefficient D() of a clay with its volumetric water content were studied. The results indicate that the unsaturated clay is actually impermeable when 25%, and small change in will change the orders of magnitude of K() when 15%. The experiments show that dispersion coefficient of unsaturated clay tends to reduce with the decrease of . As =38%,the measured dispersion coefficient is 4.12m2a-1, and as =6%,the dispersion coefficient is 0.04m2a-1,which only about 1% of the former. The migration simulations show that as 25%,plutonium migrates very slowly in the clay barrier, whereas its migration rate will be enhanced obviously when 30%.

       

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