Effects of sodium chloride solution on swelling pressure and pore distribution of expansive soils
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摘要: 利用常规三轴固结仪,进行了一系列膨胀力实验,研究了不同浓度氯化钠溶液对不同初始干密度试样的膨胀力的影响,并且利用核磁共振仪,探究了完成膨胀力试验后试样孔隙分布的情况。试验结果表明：在干密度不变的情况下,随着盐浓度增加,膨胀力逐渐减小;盐浓度越大,T2曲线分布整体往右移,说明大孔隙体积增加,小孔隙体积减小。分析试验结果认为：在相同干密度下,随着盐浓度增加,Donnan渗透压逐渐减小,导致膨胀力降低;在体积保持恒定的情况下,由于膨胀力降低,必然导致内部膨胀力相应减小,所以孔隙被填充的体积减小,使得大孔隙较多,因此随着盐溶液浓度增加,同一干密度试样的T2曲线向右移动。Abstract: A series of experiments on swelling pressure are carried out by using the conventional consolidation apparatus, and the effects of different concentrations of sodium chloride solution on the swelling pressure of samples with different initial dry densities are studied. The pore distribution of the samples after the expansive tests is investigated by NMR. The results show that the swelling pressure decreases with the increase of salt concentration under the constant dry density. The results of NMR show that the larger the salt concentration, the more the T2 curve distribution moves to the right, which indicates that the larger pore volume increases and the smaller pore volume decreases. Under the same dry density, the Donnan osmotic pressure decreases gradually with the increase of salt concentration, which leads to the decrease of the swelling pressure. And with a constant volume, because the swelling pressure decreases, the internal swelling pressure decreases accordingly, so the volume of the pores being filled decreases, which leads to larger pores. So the T2 curve of the samples with the same dry density moves to the right with the increasing concentration of salt solution.
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