首页|Application of a concrete thermal pile in cooling the warming permafrost under climate change

Application of a concrete thermal pile in cooling the warming permafrost under climate change

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Permafrost degradation caused by climate warming is posing a serious threat to the stability of cast-in-place pile foundations in warm permafrost regions.Ambient cold energy can be effectively utilized by two-phase closed thermosyphons(TPCTs)to cool the permafrost.Therefore,we installed TPCTs in a cast-in-place pile foundation to create a unique structure called a thermal pile,which effectively utilizes the TPCTs to regulate ground temperature.And we conducted a case study and numerical simulation to exhibit the cooling performance,and optimize the structure of the thermal pile.The purpose of this study is to promote the application of thermal piles in unstable permafrost regions.Based on the findings,the thermal pile operated for approximately 53％of the entire year and effectively reduced the deep ground temperature at a rate of at least-0.1 ℃ per year.Additionally,it successfully raised the permafrost table that is 0.35 m shallower than the natural ground level.These characteristics prove highly beneficial in mitigating the adverse effects of permafrost degradation and enhancing infrastructure safety.Expanding the length of the condenser section and the diameter of the TPCT in a suitable manner can effectively enhance the cooling capability of the thermal pile and ensure the long-term mechanical stability of the pile foundation even under climate warming.

Heat transferCold energyWarm permafrostTwo-phase closed thermosyphonsCast-in-place pile foundation

Yun-Hu SHANG、Fu-Jun NIU、Guo-Yu LI、Jian-Hong FANG、Ze-Yong GAO

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State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China

Da Xing'anling Observation and Research Station of Frozen-Ground Engineering and Environment,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Jagdaqi 165000,China

Qinghai Research Institute of Transportation,Xining 810008,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Gansu ProvinceNatural Science Foundation of Gansu ProvinceScience and Technology Project of State Grid Corporation of Chinaprogram of State Key Laboratory of Frozen Soil Engineering

42001063U22682164217622423JRRA66021JR7RA0515200-202230098A-1-1-ZNSKLFSE-ZT-202120

2024

10.1016/j.accre.2023.09.002

气候变化研究进展(英文版)
国家气候中心

气候变化研究进展(英文版)

影响因子：0.806
ISSN：1674-9278
年,卷(期)：2024.15(1)
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