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<p>This study proposes an ice-water phase-change embankment to improve the long-term thermal regulation of transportation infrastructure in permafrost regions. The configuration embeds sealed water-grid units in rigid insulation boards. By exploiting the conductivity contrast between liquid water and ice, the system provides high thermal resistance in the warm season and enhanced cooling in the cold season. The mechanism and composite structure are defined, and long-term performance is evaluated using finite-element simulations. Over a 50-year service period, phase-change embankments markedly slow the downward migration of the permafrost table compared with untreated and PUR-insulated embankments. In the one-layer phase-change case, the permafrost table remains about 1.5&#xa0;m below the natural ground surface, whereas the two-layer and three-layer phase-change cases improve this position to about 0.2&#xa0;m and 1.0&#xa0;m above the ground surface, respectively. The proposed system offers a promising seasonally adaptive strategy for permafrost embankments.</p>

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Thermal Stability Control of Permafrost Embankments Based on Hydrothermal Phase-Change Principles

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Haibing Chang,
  • Zhenguo Zhang,
  • Xiyuan Chen,
  • Yongtao Wang

摘要

This study proposes an ice-water phase-change embankment to improve the long-term thermal regulation of transportation infrastructure in permafrost regions. The configuration embeds sealed water-grid units in rigid insulation boards. By exploiting the conductivity contrast between liquid water and ice, the system provides high thermal resistance in the warm season and enhanced cooling in the cold season. The mechanism and composite structure are defined, and long-term performance is evaluated using finite-element simulations. Over a 50-year service period, phase-change embankments markedly slow the downward migration of the permafrost table compared with untreated and PUR-insulated embankments. In the one-layer phase-change case, the permafrost table remains about 1.5 m below the natural ground surface, whereas the two-layer and three-layer phase-change cases improve this position to about 0.2 m and 1.0 m above the ground surface, respectively. The proposed system offers a promising seasonally adaptive strategy for permafrost embankments.