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Thermal Stability Analysis and Novel Cooling Technology Field Tests for Permafrost Railway Subgrades
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Journal Article
Thermal Stability Analysis and Novel Cooling Technology Field Tests for Permafrost Railway Subgrades
2026
Overview
Global warming has intensified the climatic warming and moistening trend on the Qinghai–Tibet Plateau, threatening the thermal stability of railway subgrades in the plateau permafrost regions. However, previous studies have lacked systematic analyses that comprehensively consider the climate along the railway, permafrost conditions, and subgrade stability. Based on meteorological data and ground temperature monitoring data of permafrost subgrades along the railway, this paper comparatively analyzes the variations in air temperature, precipitation, annual mean ground temperature (AMGT) at natural sites, natural permafrost table (NPT), artificial permafrost table (APT), and settlement of the left and right shoulders of the subgrade along the railway. The results indicate that over the past 20 years, the annual mean air temperature and annual mean precipitation along the railway have increased by an average of 1.2°C and 80 mm, respectively. Compared with 2007, the AMGT of permafrost at natural sites along the railway increased by an average of 0.1°C in 2020, the NPT descended by an average of 0.58 m, while the APT was raised by an average of 2.34 m. The average settlement of the left shoulder is greater than that of the right shoulder, indicating the existence of a sunny‐shady slope effect. The state of the permafrost railway subgrade is generally stable, proving that a series of engineering protection measures adopted during construction and operation are effective. However, facing the intensifying trend of future climatic warming and moistening, it is necessary to research and reserve new, economical, and durable permafrost protection technologies in advance. The average cooling temperature of the evaporation section of the adsorption heat pipe is around −15°C, and the field test results are favorable. The subsequent all‐season cooling performance will be evaluated based on long‐term monitoring data.
Publisher
John Wiley & Sons, Inc,Wiley
Subject
