电渗作用下软土细观孔隙结构
Mesoscopic pore structure of soft soil during electro-osmosis
陶燕丽 1龚晓南 2周建 2罗战友 3祝行4
作者信息
- 1. 浙江科技学院 土木与建筑工程学院,杭州310023;浙江大学 软弱土与环境土工教育部重点实验室,杭州310058;浙江大学 滨海和城市岩土工程研究中心,杭州310058
- 2. 浙江大学 滨海和城市岩土工程研究中心,杭州310058
- 3. 浙江科技学院 土木与建筑工程学院,杭州310023;浙江大学 滨海和城市岩土工程研究中心,杭州310058
- 4. 浙江科技学院 土木与建筑工程学院,杭州310023
- 折叠
摘要
软土细观孔隙结构变化是其宏观变形的根本原因.为了探索电渗中软土细观孔隙结构变化以及与宏观变形之间的关联机制,采用杭州软土开展电渗试验,监测了电渗中土体孔隙结构分布特征和含水量,从定性和定量两个方面对试验结果进行分析.研究发现,电渗过程中,粘土颗粒重新排列形成面 面接触的片堆结构,土体孔隙比降低,孔隙空间形态变光滑,结构复杂性减弱.通过含水量计算所得孔隙比较实测孔隙比小,说明电渗排水量大于土体收缩量,这是因为,电渗本质为离子带动水分子的迁移,不能直接引起土骨架压缩.实际工程中,电渗法应与堆载、真空预压等联合使用.
Abstract
Variation of mesoscopic pore structure for soft soils is the primary cause of the macroscopical deformation.In order to study the variation of mesoscopic pore structure of soft soil as well as the correlative mechanism with macroscopical deformation during electro-osmosis,some electro-osmotic experiments were performed using Hangzhou soft soils.Pore structure distribution features and water contents of the soils were monitored during the experiments.The results were explained from the qualitative and quantitative perspectives.Clay particles were re-arranged into sheet-packed structure with plane-plane surfaces.The soil pore contracted,with resulted to decreasing of the void ratio,meanwhile the pores turned smoother in spatial forms and less complex in structure.Moreover,void ratios of the soil were computed through water content and the results were smaller than the measured values,which illustrated the electro-osmotic dewatering was larger than compression amount of soil.The fundamental cause goes to the fact that electro-osmosis derives from the migration of water dragged by ions and fails to generate compression of the soil skeleton directly.Electro-osmosis is recommended to be combined with surcharge and vacuum preloading in real practice.
关键词
电渗法/细观孔隙结构/孔隙比/电渗排水量/土体收缩量Key words
electro-osmosis/mesoscopic pore structure/void ratio/electro-osmotic dewatering/compression amount of soil引用本文复制引用
基金项目
国家自然科学基金(41572299)
国家自然科学基金(51478425)
国家自然科学基金(51708507)
浙江省自然科学基金(LQ17E090001)
浙江大学软弱土与环境土工教育部重点实验室开放基金(2016P01)
浙江科技学院人才建设经费项目(F701104F05)
出版年
2018
NETL
NSTL
维普
万方数据