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首页> 外文会议>CISM Course on Chemo-Mechanical Couplings in Porous Media Geomechanics and Biomechanics >Shear Strength of Clays and Clayey Soils: the Influence of Pore Fluid Composition
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Shear Strength of Clays and Clayey Soils: the Influence of Pore Fluid Composition

机译：粘土和粘土土壤的剪切力量：孔隙液组合物的影响

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摘要

This paper reports experimental results relative to the influence of pore fluid composition on the peak shear strength of the Bisaccia clay and on the residual shear strength of several different clayey soils: the Ponza bentonite, commercial bentonite and kaolin, Bisaccia, Gela and Marino clays. Triaxial tests were carried out on the Bisaccia clay reconstituted with distilled water and with a 1 M NaCl solution. Direct shear and ring shear tests were carried out on dry materials and on the materials reconstituted with distilled water, NaCl solutions at various concentrations, cyclohexane. Some tests were carried out by using KCl solutions, ethanol and ethylene glycoi. The results show that pore fluid composition influences greatly both the peak and residual shear strength of smectitic soils, even when the clay fraction is very low. The residual friction angle is about 5° in distilled water, 15° in concentrated NaCl solution, and varies between 30° and 35° for materials dry or prepared with cyclohexane. The residual friction angle is strongly correlated to the static dielectric constant of the pore fluid.
机译：本文报告了实验结果相对于孔隙流体组合物对Bisaccia粘土的峰剪强度的影响以及几种不同粘土土壤的残留剪切强度：Ponza膨润土，商业膨润土和高岭土，Bisaccia，Gela和Marino粘土。在与蒸馏水重构的Bisaccia粘土上进行三轴试验，并用1M NaCl溶液进行。直接剪切和环形剪切试验在干燥材料上进行，并在各种浓度下与蒸馏水重构的材料，环己烷重新溶液。通过使用KCl溶液，乙醇和乙烯甘油来进行一些测试。结果表明，即使粘土馏分非常低，孔隙流体组合物也会影响粘土污染的峰值和残留剪切强度。蒸馏水中的残余摩擦角在蒸馏水中约5°，浓缩的NaCl溶液中为15°，在30°和35°之间变化，用环己烷干燥或制备的材料。残余摩擦角与孔流体的静态介电常数强烈相关。

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