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

매설 냉각가스관의 동결-융해에 대한 수치해석 연구

Shin, Hosung;Park, Heungrock
신호성;박흥락

  • Received : 2016.04.07
  • Accepted : 2016.05.25
  • Published : 2016.06.30

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

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Acknowledgement

Supported by : 국토교통부