真空预压联合电渗法处理高含水率软土模型试验  

Model test for high-water-content soft soil treatment under vacuum preloading in combination with electroosmosis

作　　者：王柳江[1] 刘斯宏[1] 汪俊波[2] 徐伟[3] 

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]西安热工研究院有限公司,陕西西安710032 [3]中国水电顾问集团华东勘测设计研究院,浙江杭州310014

出　　处：《河海大学学报（自然科学版）》2011年第6期671-675,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家高技术研究发展计划(863计划)(2007AA11Z115);江苏省自然科学基金(BK2009344);江苏高校优势学科建设工程资助项目(苏政办发(2011)6号);中央高校基本科研业务费专项(2010B20114)

摘　　要：针对海相吹填土高含水率、高压缩性、低渗透系数的特点,提出了采用真空预压联合电渗法的地基加固方法,并通过室内模型试验对该工法的加固机制进行了初步探索.试验结果表明:初期采用真空预压排水,当试验土体达到最佳临界含水率0.85后,联合电渗法可有效地加快地基排水速度;采用真空预压联合电渗法处理吹填土,土体通常会产生较大的竖向和侧向变形,且有效提高阴极和阳极附近土体强度,因此对于真空预压仅能对表层约为42.8%地基深度的土体有效加固的问题,采用该工法可通过真空预压和电渗法分别加固表层和深层土体,由此达到深度方向均匀加固地基的目的.Based on the characteristics of dredger fill soil with high water content,high compressibility,and low permeability,this paper proposes a method of vacuum preloading in combination with electroosmosis for the reinforcement of a soft soil foundation.The preliminary investigation was made into the reinforcement mechanism through a laboratory model test.The results show that electroosmosis can effectively accelerate the drainage of the soil foundation when the water content of the soil sample reaches the optimal critical value of 0.85 after the vacuum preloading at the preliminary stage.Obvious vertical and lateral deformation as well as the increase of soil strength near the electrodes can be observed when using this method to treat dredger fill soil.Therefore,for solving the problem that vacuum preloading can only used to effectively reinforce the surface soil with a thickness of about 42.8% of the reinforced depth,the proposed method can be used to reinforce both the surface and deep soils,by vacuum preloading and electroosmosis,respectively,and can thus uniformly reinforce the soil foundation in the depth direction.

关 键 词：真空预压 电渗 软基处理 海相吹填土 模型试验 

分 类 号：TU411.93[建筑科学—岩土工程]