老化对盐溶液下粘性土压缩性、渗透性和抗剪强度的影响

IF 2.5 3区工程技术 Q2 ENGINEERING, CIVIL

Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.3.245

Emel Çakar, Y. Yukselen-Aksoy

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引用次数: 1

摘要

研究了NaCl和CaCl2溶液存在下高岭土和膨润土试样的老化对其压缩性、渗透性和抗剪强度的影响。测定了固化60、190和250天试样的压缩性、渗透性和抗剪强度参数。结果表明，随着年龄的增长，高岭土样品在Ca2+离子存在下变得更具压缩性。膨润土样品的归一化压缩指数值一般在养护60天和250天结束时有所增加。在Na+离子存在下，高岭土的标准化渗透率值随着老化而降低了近2倍。老化过程中，膨润土在NaCl和CaCl2溶液中的渗透率均有所增加。在Na+离子存在下，高岭土具有较高的max。剪应力值大于Ca2+离子。当最大值。对比了0、60和190 d试样的剪切应力值，发现NaCl溶液对高岭土试样的抗剪强度无显著影响。而高岭土在CaCl2溶液中的抗剪强度随着老化而增加。在Ca2+离子存在的情况下。膨润土剪切应力值较高。研究结果表明，老化对高岭石和膨润土的压缩性、渗透性和抗剪强度有显著影响。

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Ageing effect on compressibility, permeability and shear strength of clayey soils exposed to salt solutions

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.

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来源期刊

Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

5.20

自引率

25.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions