This study conducted laboratory tests on soft clayey soils to investigate the effectiveness of the combinations of vacuum-surcharge preloading and electro-osmotic treatment (EOC-VPM-SPM). To minimize the loss of vacuum pressure and mitigate clogging of the drainage system during the consolidation process, two improved methods were developed by optimizing technical characteristics and geometric layout of drainage boards. In the EOC-Alternate VPM-SPM method, alternate vacuum pressure was incorporated using two drainage boards with different lengths in the VPM system, combined with EOC to improve consolidation efficiency. In the multiple-electrodes EOC-VPM-SPM method, a new design of multiple drainage boards in a square tube layout fabricated through 3D printing was employed to provide efficient connections of the consolidation system. Furthermore, electrokinetic geosynthetics (EKG) was utilized as the cathode in the EOC system to minimize erosion and passivation of electrodes for the enhancement in consolidation efficiency. The properties of tested soils were analyzed to evaluate the feasibility of the improved methods. Test results indicated that the consolidation effects were significantly improved, with effectively mitigated clogging of the drainage system. Compared to the traditional method, the water content of the tested soil was reduced through the improved methods, resulting in increased uniformity of strength distribution.

中文翻译：

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真空附加预压结合电渗固结在高含水量软粘土上的改进


本研究对软粘土进行了实验室测试，以研究真空附加预压和电渗处理 （EOC-VPM-SPM） 组合的有效性。为了最大限度地减少固结过程中真空压力的损失并减轻排水系统的堵塞，通过优化排水板的技术特性和几何布局，开发了两种改进的方法。在 EOC-Alternate VPM-SPM 方法中，在 VPM 系统中使用两个不同长度的排水板加入交替真空压力，并与 EOC 相结合以提高固结效率。在多电极 EOC-VPM-SPM 方法中，采用了通过 3D 打印制造的方管布局中多个排水板的新设计，以提供固结系统的高效连接。此外，电动土工合成材料 （EKG） 被用作 EOC 系统中的阴极，以最大限度地减少电极的侵蚀和钝化，从而提高固结效率。分析了测试土壤的特性，以评估改进方法的可行性。试验结果表明，固结效果得到显著改善，有效缓解了排水系统的堵塞。与传统方法相比，通过改进方法降低了测试土壤的含水量，从而提高了强度分布的均匀性。