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

作者：Liang, Jian-Wei; Fang, Ying-Guang; Gu, Ren-Guo^*

来源：Yantu Lixue/rock and Soil Mechanics, 2010, 31(10): 3043-3050.

• Bound waters
• Coefficient of permeability
• Consolidation methods
• Experimental conditions
• Field effects
• Generation mechanism
• Particle-surface potentials
• Seepage characteristics

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.

• 出版日期2010-10
• 单位华南理工大学