蒙脱石电渗微观机理试验研究

发布时间：2018-05-16 13:34

本文选题：电渗 + 蒙脱石　；参考：《浙江大学学报(工学版)》2017年12期

【摘要】：为了在微观上探究电渗的作用机理,以单一矿物成分的蒙脱石为电渗对象,采用自制金属电极和EKG电极,设计4组平行试验,探讨土体离子迁移、电学参数、膨胀性能等物理化学方面的变化.试验结果表明,Al~(3+)迁移能力远大于Cu~(2+)和Fe~(2+),后两者难以在电场力的作用下移动,电极反应生成的金属离子对电渗排水基本没有促进作用;电渗削弱了蒙脱石的乙二醇膨胀性,且除铜电极外,铝、铁、EKG电极下电渗对靠近阴极的土的膨胀性抑制作用更强;电渗作用降低了蒙脱石的zeta电位绝对值;铝电极下Al~(3+)的渗入严重降低了Ca~(2+)的排出量,铁电极下Fe~(3+)和Fe~(2+)的渗入束缚了阳极附近土体中Na~+的迁移;铁电极和EKG电极对土体有酸化作用,而铜电极、铝电极则不然.
[Abstract]:In order to explore the mechanism of electroosmosis in microcosmic, taking montmorillonite with single mineral composition as electroosmotic object, four groups of parallel experiments were designed by using self-made metal electrode and EKG electrode, and the ion migration and electrical parameters of soil were discussed. Changes in physical and chemical properties such as expansion. The results show that the migration capacity of Cu~(2) and Fe~(2 is much higher than that of Cu~(2), the latter two are difficult to move under the action of electric field force, the metal ions produced by electrode reaction have no effect on electroosmotic drainage, and electroosmosis weakens the expansion of montmorillonite by ethylene glycol. Besides copper electrode, the effect of electroosmosis on the expansion of soil near the cathode is stronger, the absolute value of zeta potential of montmorillonite is decreased by electroosmotic effect, and the amount of Ca~(2) is seriously reduced by the infiltration of Al~(3 under aluminum electrode. The infiltration of Fe~(3 and Fe~(2 under the iron electrode binds the migration of Na ~ in the soil near the anode, while the iron electrode and the EKG electrode have the acidification effect on the soil, but the copper electrode and the aluminum electrode do not.
【作者单位】：武汉大学土木建筑工程学院;武汉建工集团股份有限公司;
【基金】：国家自然科学基金资助项目(41472039,51109168)
【分类号】：TU41

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