黄土路基双灰桩联合电渗法排水试验研究

Experimental Study on Drainage of Loess Subgrade by Dual Ash Pile Combined Electro-osmosis Drainage

非饱和黄土路基由于增湿会产生附加变形,降低路基强度。为研究非饱和土排水过程中含水率、离子含量、土体强度的变化规律,提出了双灰桩联合电渗法的排水技术,采用自主设计的试验系统进行了室内模型试验。试验表明:通过双灰桩联合电渗法使非饱和黄土路基内部的水分产生向双灰桩侧的迁移,含水率平均下降15%;两侧双灰桩中的Ca2+等离子向土体内部迁移,结合双灰桩的膨胀挤密作用以及胶凝反应,提高了路基土体的强度,对路基产生一定的加固作用。

Additional deformation will occur in unsaturated loess roadbed due to humidification,which reduces the strength of roadbed.In order to study the variation of water content,ionic content,and soil strength during the drainage process of unsaturated soils,a dual ash pile combined electro-osmosis drainage technology was proposed,and an independent model test system was used for indoor model tests.The test results show that the moisture content in the loess subgrade is transferred to the side of the dual ash pile by the method of dual ash pile combined electro-osmosis drainage,which decreases by 15%on average.The Ca2+in dual ash piles on both sides is isotropically transferred to the interior of the soil,combined with the expansion and compaction of the dual ash pile and gelation reaction,the strength of the subgrade soil is improved and the subgrade is strengthened to a certain extent.