Soil permeability coefficient is a key parameter for studying many engineering geological and geotechnical problems such as soil consolidation and settlement,infiltration and deformation,and solute transport.The classical models for predicting soil permeability coefficient are usually the relationship be-tween permeability coefficient and pore ratio or grain size,and these models can often predict the soil per-meability coefficient of a single soil body better,but generally with no wide applicability.In this paper,we analyzed a large amount of experimental data to point out the reasons why the traditional models do not have universal applicability,and clarified that pore size characteristics rather than pore ratio or grain size are the key factors in determining the soil permeability coefficient.Based on the Kozeny-Carman equation,a model of the relationship between soil permeability coefficient and pore size was established.The model is applicable to both coarse-grained and fine-grained soils,and the prediction accuracy is within one order of magnitude.This study improves the understanding of the permeability characteristics of porous media and provides a new idea for the prediction of soil permeability coefficient.
关键词
饱和土体/渗透系数/孔径/孔隙比/比表面积
Key words
saturated soil/permeability coefficient/pore size/pore ratio/specific surface area
维普
万方数据