基于电渗法的新近吹填土快速结壳试验

Experimental study on rapid crusting of fresh dredger fill based on electroosmosis

针对新近吹填土地基承载力低,无法满足机械进场施工的问题,基于电渗固结阳极区域土体固结快的特点,设计了一种新近吹填土快速结壳电渗电极,采用该电极分别开展了电渗、真空不同联合方式的室内试验,对比分析了排水量、电渗能耗、最终含水率、抗剪强度及承载力等土性参数指标。结果表明:采用该电渗电极处理后的吹填土含水率降低31.0%~61.4%,土体表层承载力最高可达192 kPa;单纯电渗处理后土层抗剪强度沿深度衰减,电渗真空联合作用下土层抗剪强度更高且分布均匀;设计的电渗电极可实现高含水率新近吹填土浅表层快速加固。

To solve the problem that the low bearing capacity of fresh dredger fill foundation that cannot meet the requirement of mechanical construction,a kind of electroosmosis electrode was developed for rapid crust of freshly dredger fill based on the characteristics of fast consolidation of soil in the anode area in electroosmosis consolidation.Laboratory tests of different combination of electroosmosis and vacuum with the electrode were carried out,and the soil parameter indexes such as soil discharge,electroosmotic energy consumption,final moisture content,shear strength and bearing capacity were comparative analyzed.The results show that the moisture content of the dredger fill is reduced by 31.0%to 61.4%after the treatment of electroosmosis electrode,and the bearing capacity of the surface layer is up to 192 kPa.After electroosmotic treatment,the shear strength of the soil layer decreases along the depth.Under the combined action of electroosmosis and vacuum,the shear strength of soil layer is higher and more uniform.The developed electroosmosis electrode can realize rapid reinforcement of the near-surface layer of fresh shallow dredger fill with high water content.