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Electrokinetic stabilisation: an overview and case study

机译：电动稳定：概述和案例研究

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This paper describes work currently underway at the University of Birmingham concerning the application of electrokinetic stabilisation to clay soils. Electrokinetic stabilisation combines the processes of electroosmosis and chemical grouting, and is most effective in silty and clayey soils where the hydraulic conductivity is low. This paper introduces electroosmotic theory and an overview of the research performed to date. Field trials are reported in which electrokinetic stabilisation is performed in a silty clay to a depth of 1.1 m below ground level. The electrodes were perforated steel tubes driven into the ground at a spacing of 2.5 m. Sodium silicate and calcium chloride solutions were introduced at the cathode and anode respectively. The results indicated significant increases in the pore water pressure close to the anode and reductions generally in the pH along the test section. However, the pH was significantly raised close to the cathode, thereby potentially creating the conditions for traditional stabilisation reactions to occur. The pore water flow was sufficiently great to inhibit the migration of silicate ions from the cathode, and only when the silicate solution was injected between the two electrodes did it enter the ground. There was an increase in plastic limit midway between electrodes after 16 days, whereas closer to the anode there was a reduction, possibly as a result of electrode degradation.
机译：本文介绍了伯明翰大学目前正在进行的有关将电动稳定技术应用于黏土的工作。电动稳定结合了电渗和化学灌浆的过程，在水力传导率低的粉质和黏性土壤中最有效。本文介绍了电渗理论和迄今为止进行的研究概述。据报道，现场试验是在粉质粘土中，在低于地面1.1 m的深度内进行电动稳定。电极是穿孔的钢管，以2.5 m的距离打入地下。将硅酸钠和氯化钙溶液分别引入阴极和阳极。结果表明，靠近阳极的孔隙水压力显着增加，而沿测试部分的pH值通常下降。但是，pH值显着升高至靠近阴极的位置，从而有可能为发生传统的稳定化反应创造条件。孔隙水的流量足以阻止硅酸根离子从阴极迁移，只有当硅酸溶液注入两个电极之间时，它才进入地面。 16天后，电极之间的中途塑性极限增加，而距离阳极更近的地方，这可能是电极降解的结果。

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