DISCUSSION ON APPLICABILITY OF CAPILLARY SEEPAGE MODELS TO LOESS PERMEABILITY
HONG Bo1,2, LI Xi'an1, WANG Li1,2, LI Lincui1
1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054;
2. Key Laboratory of Mine Geological Hazards Mechanism and Control, Shaanxi Institute of Geological Survey, Xi'an 710054
As a typical porous medium, loess has its porosity as one of its most notable characteristics. Porosity not only influences the physical and chemical characteristics of loess, but also seriously affects the hydraulic properties of loess, especially the permeability of loess. The capillary model and the classic model of porous media seepage theory have been widely used in the fields of oil and gas field mining, coal-formed gas mining and geotechnical engineering. The porous media seepage theory model is less used in the porous structure of loess. Therefore, this paper takes the permeability of loess as an example. This paper summarizes and analyzes the relatively successful porous media capillary seepage models. It selects the seepage model suitable for quantitative characterization of the permeability of loess. It discusses the capillary seepage model of porous medium. The discussions are combined with the comparison of the results of calculation and the results of the permeation test. The applicability of this method to describe loess permeability is examined. The "sausage" structure of pore(or "lotus root" structure) is proposed. The study provides a new theoretical basis for the study of loess permeability.