中文摘要：

胶体在多孔介质中的运移行为不仅取决于胶体本身的性质，同时还受到溶液离子强度、孔隙水流速等物理、化学因素的影响。本文通过室内饱和石英砂柱出流实验，探讨了高岭石胶体（Kaolinite胶体）和SiO2胶体在不同离子强度（0．0015，0．01和0．03molL^-1）和平均孔隙流速（约20和5cm h^-1）作用下的迁移行为。结果表明，随溶液离子强度增加，Kaolinite胶体和SiO2胶体的沉淀量增加；平均孔隙水流速的增加则会促进Kaolinite胶体和SiO2胶体的运移。同时还表明，离子强度和流速变化对粒径较大的Kaolinite胶体运移的影响要显著大于SiO2胶体。研究结果有助于加深胶体对污染物运移的促进机制的理解，同时对全面、客观评价地下环境的污染风险具有一定的指导意义。

英文摘要：

Colloid transport in porous media is controlled, to a large extent, by surface properties of the colloid per se and physical and chemical factors, like ionic strength, pore water velocity, etc. An outflow experiment using saturated quartz column was conducted and designed to have three level of ionic-strength （i.e. 0.001 5, 0.01 and 0.03 tool L^-1） and two pore water velocities （ i. e. 21 and 5 cm h^- 1 ） to analyze deposition and transport process of Kaolinite and SiO2. Results show that deposition processes of Kaolinite and SiO2 were distinctly enhanced with increasing ionic strength, while higher pore water velocity tended to facilitate movement of Kaolinite and SiO2, thus covering a much longer transport distance. Further analysis indicates that ionic strength and pore water velocity had a more significant impact on transport of Kaolinite （ ≥ 500 nm in particle size） than of SiO2 （ 190 nm in diameter）. The findings may further understanding of the mechanism of colloid promoting transport of pollutants, and are of some guiding significance to overall objective assessment of pollution risks of the underground environment.