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Seepage experiments of sandy loess soil column with different stress states based
on wetting front advancing method
2
2
2
CAI Guoqing 1,2 ,LIU Qianqian ,YANG Yu ,WANG Huaxiong ,LI Jian 2
(1. MOE Key Laboratory of Urban Underground Engineering,Beijing 100044,China;
2. School of Civil Engineering and Architecture,Beijing Jiaotong University,Beijing 100044,China)
Abstract:Due to the limitations of the test apparatus,most of the studies on the permeability of unsaturat⁃
ed soil ignore the influence of stress on the permeability coefficient. In this paper,a hydro-mechanical cou⁃
pling apparatus was developed independently, and the seepage soil column experiment was carried out on
sandy loess with this apparatus. Wetting front advancing method was used to explore the effect of different
initial dry density and stress on unsaturated permeability coefficient, and the evolution law of permeability
and axial displacement of sandy loess under the hydro-mechanical coupling was obtained. The permeability
coefficient of the soil column decreases with the increase of the matric suction and the permeability func⁃
tions at different sections are hierarchical. The permeability coefficient of soil decreases with the increase of
initial dry density and axial stress. As the axial stress increases,the stable permeability coefficients of soil
columns with different initial dry densities tend to be consistent. Sandy loess has greater water sensitivity,
and the soil structure is destroyed under hydro-mechanical coupling,resulting in a large difference in axial
displacement before and after wetting.
Keywords: sandy loess; unsaturated permeability coefficient; soil column experiment; hydro-mechanical
coupling;wetting front advancing method
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