Thermal enhancement of targeted cooling thermosyphon array applied to the embankment–bridge transition section of the Qinghai–Tibet Railway in warm permafrost
Permafrost degradation in the embankment–bridge transition section (EBTS) along the Qinghai–Tibet Railway has led to extensive damage to bridge structures, posing a serious threat to railway safety. With the ongoing global warming, reinforcing the affected EBTS to ensure long-term stability remains...
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KeAi Communications Co., Ltd.
2024-12-01
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| Series: | Advances in Climate Change Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S167492782400145X |
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| author | Kun Chen Guo-Yu Li Qi-Hao Yu Yan-Hui You Ming-Yang Jin Jin-Xin Lu Yao-Jun Zhao |
| author_facet | Kun Chen Guo-Yu Li Qi-Hao Yu Yan-Hui You Ming-Yang Jin Jin-Xin Lu Yao-Jun Zhao |
| author_sort | Kun Chen |
| collection | DOAJ |
| description | Permafrost degradation in the embankment–bridge transition section (EBTS) along the Qinghai–Tibet Railway has led to extensive damage to bridge structures, posing a serious threat to railway safety. With the ongoing global warming, reinforcing the affected EBTS to ensure long-term stability remains a pressing challenge. To address this issue, this study proposes a targeted cooling thermosyphon array (TCTA) approach utilising variable inclination evaporator (VIE) thermosyphons. The effectiveness of the VIE thermosyphon was evaluated through an in-situ test. Meanwhile, a three-dimensional numerical model was employed to analyse the overall cooling effect, long-term performance and thermal enhancement provided by the TCTA approach. The findings indicated that the VIE thermosyphon exhibited excellent cooling performance and maintained uniform wall temperature, with the lowest wall temperature reaching −15 °C. Within one year of implementation, a cold core of −2 °C formed at the centre of the foundation, and the permafrost table was uplifted by approximately 3 m, showcasing its potential to rapidly enhance the thermal stability of in-service EBTS in permafrost. With prolonged operation, the cold accumulative effect of this approach gradually becomes apparent, and the range of the low-temperature cores expands. This method effectively reinforces the thermal stability of in-service EBTS and is well-suited for future railway construction in warm permafrost amidst the challenges of climate change. |
| format | Article |
| id | doaj-art-6d141bc47f4a4b1cb7a18549263d7ead |
| institution | Kabale University |
| issn | 1674-9278 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Advances in Climate Change Research |
| spelling | doaj-art-6d141bc47f4a4b1cb7a18549263d7ead2025-01-15T04:11:34ZengKeAi Communications Co., Ltd.Advances in Climate Change Research1674-92782024-12-0115611601176Thermal enhancement of targeted cooling thermosyphon array applied to the embankment–bridge transition section of the Qinghai–Tibet Railway in warm permafrostKun Chen0Guo-Yu Li1Qi-Hao Yu2Yan-Hui You3Ming-Yang Jin4Jin-Xin Lu5Yao-Jun Zhao6Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, ChinaKey Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, ChinaKey Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Corresponding author.Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, ChinaKey Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, ChinaChina Railway Qinghai–Tibet Group Company, Xining 810000, ChinaChina Railway Qinghai–Tibet Group Company, Xining 810000, ChinaPermafrost degradation in the embankment–bridge transition section (EBTS) along the Qinghai–Tibet Railway has led to extensive damage to bridge structures, posing a serious threat to railway safety. With the ongoing global warming, reinforcing the affected EBTS to ensure long-term stability remains a pressing challenge. To address this issue, this study proposes a targeted cooling thermosyphon array (TCTA) approach utilising variable inclination evaporator (VIE) thermosyphons. The effectiveness of the VIE thermosyphon was evaluated through an in-situ test. Meanwhile, a three-dimensional numerical model was employed to analyse the overall cooling effect, long-term performance and thermal enhancement provided by the TCTA approach. The findings indicated that the VIE thermosyphon exhibited excellent cooling performance and maintained uniform wall temperature, with the lowest wall temperature reaching −15 °C. Within one year of implementation, a cold core of −2 °C formed at the centre of the foundation, and the permafrost table was uplifted by approximately 3 m, showcasing its potential to rapidly enhance the thermal stability of in-service EBTS in permafrost. With prolonged operation, the cold accumulative effect of this approach gradually becomes apparent, and the range of the low-temperature cores expands. This method effectively reinforces the thermal stability of in-service EBTS and is well-suited for future railway construction in warm permafrost amidst the challenges of climate change.http://www.sciencedirect.com/science/article/pii/S167492782400145XEmbankment–bridge transition sectionPermafrost degradationTargeted cooling thermosyphon arrayLow-temperature coreCold accumulative effect |
| spellingShingle | Kun Chen Guo-Yu Li Qi-Hao Yu Yan-Hui You Ming-Yang Jin Jin-Xin Lu Yao-Jun Zhao Thermal enhancement of targeted cooling thermosyphon array applied to the embankment–bridge transition section of the Qinghai–Tibet Railway in warm permafrost Advances in Climate Change Research Embankment–bridge transition section Permafrost degradation Targeted cooling thermosyphon array Low-temperature core Cold accumulative effect |
| title | Thermal enhancement of targeted cooling thermosyphon array applied to the embankment–bridge transition section of the Qinghai–Tibet Railway in warm permafrost |
| title_full | Thermal enhancement of targeted cooling thermosyphon array applied to the embankment–bridge transition section of the Qinghai–Tibet Railway in warm permafrost |
| title_fullStr | Thermal enhancement of targeted cooling thermosyphon array applied to the embankment–bridge transition section of the Qinghai–Tibet Railway in warm permafrost |
| title_full_unstemmed | Thermal enhancement of targeted cooling thermosyphon array applied to the embankment–bridge transition section of the Qinghai–Tibet Railway in warm permafrost |
| title_short | Thermal enhancement of targeted cooling thermosyphon array applied to the embankment–bridge transition section of the Qinghai–Tibet Railway in warm permafrost |
| title_sort | thermal enhancement of targeted cooling thermosyphon array applied to the embankment bridge transition section of the qinghai tibet railway in warm permafrost |
| topic | Embankment–bridge transition section Permafrost degradation Targeted cooling thermosyphon array Low-temperature core Cold accumulative effect |
| url | http://www.sciencedirect.com/science/article/pii/S167492782400145X |
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