The consolidation characteristics of kaolin, bentonite, their mixtures, and natural clays have been widely evaluated. However, the effect of pore fluid on the consolidation characteristics of artificially structured kaolin-bentonite mixtures should be more investigated. In this study, the oedometer tests were carried out on mixtures of kaolin with 10%, 20%, and 30% bentonite reconstituted with distilled water and 1 M NaCl. The testing samples with an “artificial structure” were prepared using the preconsolidation procedure. The test results show that bentonite greatly affects the consolidation behavior of mixture samples, especially when the pore fluid is distilled water. In the case of distilled water, the addition of bentonite to kaolin clay significantly increased the compression index (C_c), swelling index (C_s), and coefficient of volume change (). In this case, the of mixture samples increased significantly at low effective axial stress (σ^′_a) levels (less than the preconsolidation pressure) and then decreased as the σ^′_a further increased. In the case of 1 M NaCl as the pore fluid, the C_c, C_s, and slightly changed with the increase of bentonite content. The research results also confirmed that the effect of saline water on the compression index was noticeable when the liquid limit of soil with distilled water was higher than 110%, and the compression index of soil with distilled water was higher than 1. Regarding the coefficient of consolidation (), the of kaolin sample increased as the σ′_a increased, and this trend was independent of the pore fluid chemistry. By contrast, the  − σ^′_a trend of mixture samples depended not only on the pore fluids but also on the stress level.

中文翻译：

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不同孔隙流体的人工结构高岭土-膨润土混合物的固结特性

高岭土，膨润土，其混合物和天然粘土的固结特性已得到广泛评估。但是，应进一步研究孔隙流体对人工结构化高岭土-膨润土混合物固结特性的影响。在这项研究中，用高岭土与10％，20％和30％的膨润土用蒸馏水和1 M NaCl复溶的混合物进行了里程表测试。使用预固结程序制备具有“人工结构”的测试样品。测试结果表明，膨润土极大地影响了混合样品的固结性能，特别是当孔隙流体为蒸馏水时。就蒸馏水而言，向高岭土中添加膨润土可显着提高压缩指数（C _c），溶胀指数（C _s）和体积变化系数（）。在这种情况下，混合物的样品在低温有效轴向应力（显著增加σ ^'_一个）水平（小于预固结压力），然后减小为σ ^'_一个进一步增加。在以1 M NaCl作为孔隙流体的情况下，C _c，C _s和膨润土含量的增加略有变化。研究结果还证实，当含蒸馏水的土壤的液位高于110％，且含蒸馏水的土壤的压缩指数高于1时，盐水对压缩指数的影响是明显的。合并（），该高岭土的样品增加为σ '_一增加，这种趋势是独立孔隙流体化学。相比之下， -  σ ^'_一混合物样本的趋势不仅取决于孔隙流体也对压力水平。