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减饱和法是近年来提出的一种可液化地基处理方法,其基本原理是通过工程措施减小饱和砂土地基中的饱和度,将饱和砂土地基变成不饱和的砂土地基,从而提高地基的抗液化强度,减轻地震时产生的液化震害。根据电解水的原理,采用新型可导电的塑料排水板为电极,开展了饱和砂土地基的电解试验,通过试验中产生气泡的宏观现象,确定了电解试验应采用的电极间距、电解电压、电极布置型式。基于室内振动台对电解减饱和法的抗液化效果进行了试验研究,考虑了电极在砂土地基中的竖向布置、水平布置和倾斜布置对地基抗液化效果的影响。结果表明,3种电极布置方案中水平电极布置方案在振动时产生的超孔压最小,抗液化效果最好。同时开展了电解后静置工况下的振动台试验,结果表明静置一段时间后,电解产生的减饱和作用仍然明显,但地基深部的气泡存在上移运动的趋势。在实际应用过程中,可以定期进行地基土体的电解作业,从而提高可液化地基的抗液化能力。
The desaturation method is a liquefiable foundation treatment method proposed in recent years. Its basic principle is to reduce the saturation in the saturated sand foundation by engineering measures and change the saturated sand foundation into an unsaturated sandy foundation so as to improve Anti-liquefaction strength of foundation to reduce liquefaction damage caused by earthquake. According to the principle of electrolyzed water, a new type of conductive plastic drainage board is used as electrode, and the electrolytic test of saturated sand foundation is carried out. Through the macroscopic phenomena of bubbles in the test, the electrode spacing, electrolysis voltage, electrode Layout type. The anti-liquefaction effect of the electrolytic desaturation method was studied based on the indoor shaking table, and the influence of the vertical arrangement, horizontal arrangement and inclined arrangement of the electrodes on the anti-liquefaction effect of the foundation was considered. The results show that the horizontal electrode arrangement scheme of the three kinds of electrode arrangement scheme has the smallest excess pore pressure during vibration, and has the best anti-liquefaction effect. At the same time, the shaking table test under the static condition after electrolysis was carried out. The results show that the desaturation effect by electrolysis is still obvious after standing for some time, but the bubble in the deep part of the foundation tends to move upwards. In practical application, the electrolysis of foundation soil can be carried out on a regular basis to improve the liquefaction resistance of the liquefiable foundation.