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首页> 外文期刊>Geomechanics and engineering >Ageing effect on compressibility, permeability and shear strength of clayey soils exposed to salt solutions
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Ageing effect on compressibility, permeability and shear strength of clayey soils exposed to salt solutions

机译：暴露于盐溶液的粘土土壤压缩性，渗透性和剪切强度的衰老作用

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摘要

The present study investigated the ageing effect on compressibility, permeability and shear strength behavior of kaolin and bentonite samples in the presence of NaCl and CaCl2 solutions. The compressibility, permeability and shear strength parameters were determined on the 60, 190, and 250 days cured samples. The results have shown that, the kaolin sample becomes more compressible in the presence Ca2+ ions with ageing. Generally, the normalized compression index values of bentonite samples increased at the end of 60 days and 250 days curing time periods. The normalized permeability value of kaolin decreased by ageing in the presence of Na+ ions almost twofold. The permeability values of bentonite increased both in NaCl and CaCl2 solutions during ageing. In the presence of Na+ ions kaolin had higher max. shear stress value than Ca2+ ions. When the max. shear stress values of 0, 60 and 190 days samples were compared, it was seen that NaCl solution had no significant effect on the shear strength of kaolin sample. However, the shear strength of kaolin increased in the CaCl2 solution during ageing. In the presence of Ca2+ ions the max. shear stress value of bentonite was higher. The results of this study have shown that ageing has significant effects on the compressibility, permeability and shear strength of kaolinitic and bentonitic clayey soils.
机译：本研究研究了在NaCl和CaCl 2溶液存在下高岭土和膨润土样品对高碱和膨润土样品的变老化。在60,190和250天固化样品上测定可压缩性，渗透率和剪切强度参数。结果表明，高岭土样品在具有老化的情况下在存在Ca 2 +离子中变得更可压。通常，膨润土样品的标准化压缩指数值在60天和250天固化时间段的末端增加。在几乎双重的Na +离子存在下老化，高岭土的归一化渗透值降低。在老化期间NaCl和CaCl2溶液中膨润土的渗透率增加。在Na +离子的存在下，高岭土具有更高的最大值。剪切应力值比Ca2 +离子。当最大值。比较剪切应力值0,60和190天的样品，看来NaCl溶液对高岭土样品的剪切强度没有显着影响。然而，在老化期间CaCl 2溶液中高岭土的剪切强度增加。在Ca2 +离子的存在下最大。膨润土的剪切应力值更高。该研究的结果表明，老化对高潮和膨润土粘土土壤的可压缩性，渗透性和剪切强度具有显着影响。

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