| Loess is a kind of sediments which formed arid climate conditions of sediment quaternary geological period, and there are approximately 630,000 km2 loess area in China,which accounted for about 4.9% of the world’s total loess area. Wherein collapsible loess distribution area of about 380,000 km2 in China, accounting for 60% of the total area of loess,mostly distributed in the middle reaches of the Yellow River, to the distribution of loess in Shanxi, Shaanxi and Gansu Loess Plateau composed of representatives. Because loess endowed with collapsible, water sensitivity, erodibility, disintegrative, etc. and water of the engineering geological properties of closely related, making some relevant geological hazards problems are highlighted, which related to the permeability problem is especially serious geological disasters.In this paper, to take Yanan new district collapsible loess as the research object,combined with "cutting hills to made the city" of Yan’an New District construction with large filling engineering problems. Analysed the undisturbed and remolded loess’ permeability rule through the saturated permeability test; By the test of the wet sink and collapsibility after penetration experiment in the influence law of the wet sink on the permeability coefficient was analyzed. Finally, the capillary model of porous media seepage theory is introduced into the loess, through theoretical analysis and test data analysis, discusses the introduction of porous media flow model to describes the applicability in the loess permeability. |
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