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http://dx.doi.org/10.7843/kgs.2017.33.3.49

Numerical Study on Freezing and Thawing Process in Modular Road System  

Shin, Hosung (Dept. of Civil & Environmental Engrg., Univ. of Ulsan)
Kim, Jinwook (Dept. of Civil & Environmental Engrg., Univ. of Ulsan)
Lee, Jangguen (Korea Institute of Civil Engineering and Building Technology)
Kim, Dong-Gyou (Korea Institute of Civil Engineering and Building Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.33, no.3, 2017 , pp. 49-62 More about this Journal
Abstract
In order to understand response of geo-structures to the freezing-thawing process in the ground, it is necessary to consider phase change of the pore water of the ground and also to understand soil interaction with structures. In this study, numerical analysis was carried out for freezing and thawing effect on the modular road system. Neumann's theoretical equation for freezing-thawing processes in porous media can be used to estimate frozen depth and heaving from basic soil properties and ground and surface temperature, but its application is limited to the case for the sediment with fully saturated condition and zero unfrozen water content. Numerical analysis of the modular road system was performed on various soil types and different ground water table as the varying freezing index. The amount of heaving in the silty soil was much larger than those in granite weathered soil or sandy soil, and lowering groundwater level reduced ground heaving induced by freezing. Numerical analysis for temperature history of the ground surface predicted residual heaving near the surface by the freeze-thaw process in silty soil. It ought to reduce stiffness and bearing capacity of the ground so that it will impair stability and serviceability of new road system. However, the amount of residual heaving was insignificant for the road system installed in weathered soil granite and sandy soil. Since modular road system is a pavement structure mounted on the supporting substructure unlike the prevalent road pavement system, strict criteria should be applied for uniform and differential settlement of the pavement system.
Keywords
Modular road system; Frozen soil; THM coupling numerical analysis;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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