淤泥土中筒型基础负压电渗加固试验研究

Experimental study of muddy soil inside bucket foundation using vacuum electro-osmotic reinforcement

筒型基础在淤泥土地基中要实现较高的承载能力,需对筒内淤泥土进行加固处理.通过负压法及负压电渗加固法对300mm和600mm筒径的筒型基础模型进行加固试验,结果显示在对地基仅采用抽负压处理时,筒径尺寸的变化对于土体最终处理效果基本没有影响,而相比于单一的负压加固法,负压电渗加固法对筒型基础的加固效果更为有效,尤其筒径越大电渗的作用效果越明显.分析发现负压电渗加固法存在一个有效时间点,通电时间控制在有效时间点附近可以在有限的时间内取得良好的地基处理效果,避免过多的能量损耗.

The muddy soil in the bucket foundation should be reinforced to achieve bearing capacity requirements of bucket foundation in muddy soil. Vacuum method and vacuum electro-osmosis method are employed to reinforce the models of 300 mm and 600 mm diameter bucket foundations. The test results show that the diameter variation has little effect on the final reinforcing effect of muddy soil using vacuum method. Compared with vacuum method, vacuum electro-osmosis method is more effective for the reinforcement of bucket foundation, and the electro-osmosis reinforcing effect is more evident with the increase of the bucket diameter. And analytical results indicate that there is a reasonable time point of power-on. At the time point, good effects of soil treatment can be achieved and excessive energy loss is avoided.