电渗联合化学溶液加固淤泥质软土试验研究

赵洪星

doi:10.11988/ckyyb.20210567

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长江科学院院报 ›› 2022, Vol. 39 ›› Issue (5) : 99-105. DOI: 10.11988/ckyyb.20210567

岩土工程

电渗联合化学溶液加固淤泥质软土试验研究

赵洪星

作者信息 +

Mechanism of Using Electroosmosis and Different Chemical Solutions to Reinforce Mucky Clay

ZHAO Hong-xing

Author information +

文章历史 +

摘要

采用自制室内试验装置,研究电渗联合化学溶液对淤泥质软土的排水固结效果。通过对比分析电流值、电渗排水量、抗剪强度和微观结构等方面的差异,进一步揭示了不同化学溶液对电渗固结效果的影响机理。试验结果表明:化学溶液的加入可以促进电渗排水,而小原子量、低价态离子的促进效果更为显著,在本次试验中Na⁺>Ca²⁺>Al³⁺;运动到阴极附近的Ca²⁺、Al³⁺离子可以参与反应生成胶结物质,增强了土颗粒间的黏结力,提高了阴极土体的抗剪强度,其中以Ca²⁺离子增强效果最明显,土体抗剪强度提高了3.5倍;而化学溶液的加入则会加速电极腐蚀和土体的酸碱化。

Abstract

A one-dimensional laboratory test program is performed to investigate the strengthening effect of electroosmosis incorporated anolyte on mucky clay. By comparing the differences in electroosmotic current, drainage, shear strength and microstructure of soil, the mechanism of various anolyte accelerating the electroosmotic dewatering is further revealed. The testing results show that the injection of chemical solution facilitates the electrochemical drainage. Cations with lower atomic weight and valence have more significant effect: Na⁺>Ca²⁺>Al³⁺. The Ca²⁺ and Al³⁺ cations migrated to cathodic region react with hydroxyl ion to produce cementing agent, which enhances the cohesion between soil particles and improves soil's shear strength. Ca²⁺ has the strongest improvement effect by enhancing the shear strength of the cathodic soil by as much as 350%. Moreover, the injection of chemical solutions will also accelerate electrode corrosion and induce larger variation of pH value.

导出引用

赵洪星. 电渗联合化学溶液加固淤泥质软土试验研究[J]. 长江科学院院报. 2022, 39(5): 99-105 https://doi.org/10.11988/ckyyb.20210567

ZHAO Hong-xing. Mechanism of Using Electroosmosis and Different Chemical Solutions to Reinforce Mucky Clay[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(5): 99-105 https://doi.org/10.11988/ckyyb.20210567

中图分类号： TU411

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