极细颗粒黏土渗流的微电场效应分析

›› 2010, Vol. 31 ›› Issue (10): 3043-3050.

极细颗粒黏土渗流的微电场效应分析

梁健伟¹，房营光^{2, 3}，谷任国^{2, 3}

1.广东省电力设计研究院，广州 510663；2.华南理工大学土木与交通学院，广州 510641；3.亚热带建筑科学国家重点试验室，广州 510641

收稿日期:2009-09-07 出版日期:2010-10-10 发布日期:2010-10-14
通讯作者: 谷任国，男，1979年生，博士后，主要从事岩土及地下结构方面的基础研究。 E-mail:rggu@scut.edu.cn
作者简介:梁健伟，男，1981年生，博士，主要从事岩土及地下结构方面的基础研究。
基金资助:
亚热带建筑科学国家重点实验室自主研究课题资助项目（No. 2008ZA11）。

Analysis of microelectric field effect of seepage in tiny-particle clay

LIANG Jian-wei¹, FANG Ying-guang ^{2, 3,} GU Ren-guo ^{2, 3}

1. Guangdong Electric Power Design Institute, Guangzhou 510663, China; 2. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; 3. State Key Laboratory of Subtropical Building Science, Guangzhou 510641, China

Received:2009-09-07 Online:2010-10-10 Published:2010-10-14

摘要/Abstract

摘要：

采用渗流固结法试验结合颗粒表面电位分析，研究极细颗粒黏土的渗流的微电场效应，在相同试验条件下完成了5种含不同百分比的人工高岭土与人工膨润土的试样的渗流特性测试。测试结果表明，微孔渗流的微电场效应对极细颗粒黏土的渗流特性有相当显著的影响，随着孔隙液离子浓度的升降或土颗粒表面电位的增减，试样的渗透系数会随之发生改变；在相同的孔隙液离子浓度下，随着膨润土相对含量的增加，试样的渗透系数随之降低。对科威特软土的渗流固结试验证实了人工土的微电场效应的产生机制与变化规律同样适用于天然软土。试验结果分析认为，在黏土-水-电解质系统的相互作用下，黏土矿物通过土颗粒表面的结合水影响试样的渗流特性，而土颗粒表面电荷的微电场作用是极细颗粒黏土渗流特性改变的内在原因之一。

关键词: 极细颗粒黏土, 渗流固结法, 表面电位, 渗流的微电场效应, 结合水, 等效渗透系数

Abstract:

To explore the microelectric field effect of seepage(MEFES) in tiny-particle clay, consolidation experiments combined with analysis of particle surface potential are carried out. Five kinds of samples with different contents of kaolinite and bentonite are tested under the same experimental condition. The results show that the MEFES in micropore have great influence on seepage characteristic of tiny-particle clay. The permeability coefficient changes with the ion concentrations in pore water or with the surface potential on clay particles; and that the permeability coefficient decreases with the increasing relative content of bentonite under the same ion concentration in pore water. The same tests on Kuwait soil verify that the generation mechanism and regularity of MEFES in artificial soil can also be applied to natural soft soil. The conclusion shows that under the interaction of clay-water-electrolyte system, clay minerals influence the seepage characteristics in clay by bound water on the particle surface; and one of the intrinsic reasons for the change of the seepage characteristics in tiny-particle clay is the microelectric field effect produced by surface charges on clay particles.

Key words: tiny-particle clay, seepage consolidation method, surface potential, microelectric field effect of seepage (MEFES), bound water, equivalent coefficient of permeability

中图分类号:

TU 411

梁健伟，房营光，谷任国. 极细颗粒黏土渗流的微电场效应分析[J]. , 2010, 31(10): 3043-3050.

LIANG Jian-wei, FANG Ying-guang, GU Ren-guo. Analysis of microelectric field effect of seepage in tiny-particle clay[J]. , 2010, 31(10): 3043-3050.

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