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http://dx.doi.org/10.7843/kgs.2016.32.6.17

Numerical Investigation of Freezing and Thawing Process in Buried Chilled Gas Pipeline  

Shin, Hosung (Dept. of Civil & Environmental Engrg., Univ. of Ulsan)
Park, Heungrock (Dept. of Civil & Environmental Engrg., Univ. of Ulsan)
Publication Information
Journal of the Korean Geotechnical Society / v.32, no.6, 2016 , pp. 17-26 More about this Journal
Abstract
Characteristic behaviors of geo-structure during freezing and thawing process have to be understood based on fundamental knowledge on phase change in porous soil and interaction between soil and structure. Inversion analysis using published one-dimensional soil freezing tests was conducted to suggest a mechanical model to consider an effect of the ice saturation on Young's modulus. Silty soil was more sensitive to temperature than weathered granite soil and sand, and weathered granite soil was more affected by initial water saturation in stiffness decrease than silty soil. Numerical simulations on chilled gas pipeline showed that shielding effect from surrounding frozen zone around the pipe decreases impact from external load onto the pipe. And a pipe installed in sand backfill showed more heaving due to relatively low stiffness of sand during freezing than that of surrounding in-situ weather granite soil. However, it had more stable stress condition due to effective stress redistribution from external load.
Keywords
Frozen soil; THM coupling; Chilled gas pipeline;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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