电渗复合真空覆水预压法加固吹填土地基的应用研究  

Application and Research of Combination of Electro-osmotic Method and Vacuum-overlying Water Preloading Method for Strengthening Dredger Fill

作　　者：沈扬[1] 陶明安[1] 刘志浩[1] 刘汉龙[1] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《土木工程与管理学报》2012年第3期43-46,共4页Journal of Civil Engineering and Management

基　　金：浙江省重大科技专项(2009C03001)

摘　　要：吹填土渗透系数小,结合水含量高,常规排水固结法只能排除地基土中的自由水,且真空传递效率低。而电渗法已经被证明可以有效排除土体中的结合水。故提出电渗复合真空覆水预压加固吹填土的方法,并结合温州某吹填土地基处理工程,对电渗复合真空覆水预压技术进行了现场试验研究。结果表明,电渗法能够有效降低地下水位,并对土体后期强度增长的贡献明显;电渗复合真空覆水预压法加固效果好于真空覆水预压法,在地基土的沉降速率上有显著优势,达到相同地基处理效果,施工工期更短,为该技术的推广应用提供借鉴和指导。Dredger fill has low permeability and high contant of bound water. Conventional vacuum preloading method can only exclude free water from the ground, and the efficiency is low to the such kind of soil. While electro-osmosis method has proved to be effective in the exclusion of bound water. So the combination of the electro-osmosis method and the vacuum-overlying water preloading method, was proposed to improve dredger fill ground. And the correlated in-suit tests were performed with the dredger fill ground treatment project in Wenzhou. The results showed that electro-osmosis method could effectively lower the groundwater level and contributed significantly to the growth of soil＇ s late strength. The combination method with electro-osmosis and vacuum preloading has achieved better effects than the vacuum preloading method alone, especially in the shortening of the construction period by increasing of the ground settlement rate.

关 键 词：电渗法 真空预压 覆水 吹填土 地基处理 

分 类 号：TU472.33[建筑科学—结构工程]