Permeability Anisotropy of Loess under Influence of Dry Density and Freeze–Thaw Cycles
Publication: International Journal of Geomechanics
Volume 19, Issue 9
Abstract
Loess, a kind of special soil, is widespread in the seasonally frozen soil regions and featured with well-developed joints and pore structure. Notwithstanding, the permeability anisotropy nature of loess can badly impact the safety of construction in such regions. Despite many influencing factors, the effect of dry density and freeze–thaw cycles plays a major role in the permeability anisotropy nature. This study uses the Global Digital Systems (GDS) triaxial permeability apparatus to investigate the permeability anisotropy nature of the Q3 horizontally and vertically cut loess specimens retrieved from an excavation pit in Xi’an, Shaanxi Province. The experimental results show that the loess possesses a distinct permeability anisotropy nature, and it is intensified when subjected to the effect of particle densification. The higher the initial moisture content, the greater the pore structure change, and the weaker the permeability anisotropy nature. The increasing cycle number promotes the growth of pore ice and subsequently the bridging pore structure, improving the pore connectivity. Despite the bridging impeding the groundwater seepage in the vertical direction, the freezing–thawing cycle of more than five times, in turn, mitigates this phenomenon, and the pore connectivity in the vertical direction outweighs the horizontal one in the end.
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Acknowledgments
This study would not have been possible without financial supports from the National Nature Science Foundation of China under Grants 51078309 and 51608436, the Natural Science Foundation of Shaanxi Province under Grant 2014JM7298, and the Shaanxi Province Education Department under Grant 15JK1406.
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International Journal of Geomechanics
Volume 19 • Issue 9 • September 2019
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© 2019 American Society of Civil Engineers.
History
Received: Apr 6, 2018
Accepted: Mar 21, 2019
Published online: Jun 18, 2019
Published in print: Sep 1, 2019
Discussion open until: Nov 18, 2019
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