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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。
The seepage solidification method was used in combination with the analysis of the surface potential of the particles to study the micro-electric field effect of the seepage of the ultrafine granular clay. Under the same experimental conditions, the seepage characteristics of five samples with different percentages of artificial kaolin and artificial bentonite were tested. The test results show that the micro-electric field effect of microporous seepage has a very significant effect on the seepage characteristics of very fine granular clay. With the increase of pore fluid ionic concentration or the increase or decrease of the surface potential of soil particles, the permeability coefficient of the sample will follow Changes with the same pore fluid ionic concentration, with the relative content of bentonite increases, the permeability of the sample decreases. The seepage consolidation test on Kuwaiti soft soil confirms that the mechanism and variation of the micro-electric field effect of artificial soil are also applicable to natural soft soil. The experimental results show that the clay mineral affects the seepage characteristics of the sample through the interaction of the clay-water-electrolyte system with the bound water on the surface of the soil particles, while the micro-electric field effect of the soil particle surface charge changes the seepage characteristics of the fine-grained clay One of the internal reasons.