Prediction of the Temperature Field in a Tunnel during Construction Based on Airflow–Surrounding Rock Heat Transfer
It is important to determine the ventilation required in the construction of deep and long tunnels and the variation law of tunnel temperature fields to reduce the numbers of high-temperature disasters and serious accidents. Based on a tunnel project with a high ground temperature, with the help of...
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MDPI AG
2024-09-01
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| author | Guofeng Wang Yongqiao Fang Kaifu Ren Fayi Deng Bo Wang Heng Zhang |
| author_facet | Guofeng Wang Yongqiao Fang Kaifu Ren Fayi Deng Bo Wang Heng Zhang |
| author_sort | Guofeng Wang |
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| description | It is important to determine the ventilation required in the construction of deep and long tunnels and the variation law of tunnel temperature fields to reduce the numbers of high-temperature disasters and serious accidents. Based on a tunnel project with a high ground temperature, with the help of convection heat transfer theory and the theoretical analysis and calculation method, this paper clarifies the contribution of various heat sources to the air demand during tunnel construction, and reveals the important environmental parameters that determine the ventilation value by changing the construction conditions. The results show that increasing the fresh air temperature greatly increases the required air volume, and the closer the supply air temperature is to 28 °C, the more the air volume needs to be increased. The air temperature away from the palm face is not significantly affected by changes in the supply air temperature. Adjusting the wall temperature greatly accelerates the rate of temperature growth. The supply air temperature rose from 15 to 25 °C, while the tunnel temperature at 800 m only increased by 1.5 °C. Over a 50 m range, the wall temperature rose from 35 to 60 degrees Celsius at a rate of 0.0842 to 0.219 degrees Celsius per meter. The total air volume rises and the surface heat transfer coefficient decreases as the tunnel’s cross-section increases. For every 10 m increase in the tunnel diameter, the temperature at 800 m from the tunnel face drops by about 0.5 °C. Changing the distance between the air duct and the tunnel face has little influence on the temperature distribution law. The general trend is that the farther the air duct outlet is from the tunnel face, the higher the temperature is, and the maximum difference is within the range of 50 m~250 m from the tunnel face. The maximum difference between the air temperatures at 12 m and 27 m is 0.79 °C. The geological structure and geothermal background have the greatest influence on the temperature prediction of high geothermal tunnels. The prediction results are of great significance for guiding tunnel construction, formulating cooling measures, and ensuring construction safety. |
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| language | English |
| publishDate | 2024-09-01 |
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| series | Buildings |
| spelling | doaj-art-dfea7864292a444fbdbb9c8a0e4914e22025-08-20T01:56:01ZengMDPI AGBuildings2075-53092024-09-01149290810.3390/buildings14092908Prediction of the Temperature Field in a Tunnel during Construction Based on Airflow–Surrounding Rock Heat TransferGuofeng Wang0Yongqiao Fang1Kaifu Ren2Fayi Deng3Bo Wang4Heng Zhang5Guizhou Road and Bridge Group Co., Ltd., Guiyang 550001, ChinaGuizhou Road and Bridge Group Co., Ltd. 1 ST Branch, Guiyang 550001, ChinaGuizhou Road and Bridge Group Co., Ltd. 1 ST Branch, Guiyang 550001, ChinaGuizhou Road and Bridge Group Co., Ltd. 1 ST Branch, Guiyang 550001, ChinaKey Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, ChinaKey Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, ChinaIt is important to determine the ventilation required in the construction of deep and long tunnels and the variation law of tunnel temperature fields to reduce the numbers of high-temperature disasters and serious accidents. Based on a tunnel project with a high ground temperature, with the help of convection heat transfer theory and the theoretical analysis and calculation method, this paper clarifies the contribution of various heat sources to the air demand during tunnel construction, and reveals the important environmental parameters that determine the ventilation value by changing the construction conditions. The results show that increasing the fresh air temperature greatly increases the required air volume, and the closer the supply air temperature is to 28 °C, the more the air volume needs to be increased. The air temperature away from the palm face is not significantly affected by changes in the supply air temperature. Adjusting the wall temperature greatly accelerates the rate of temperature growth. The supply air temperature rose from 15 to 25 °C, while the tunnel temperature at 800 m only increased by 1.5 °C. Over a 50 m range, the wall temperature rose from 35 to 60 degrees Celsius at a rate of 0.0842 to 0.219 degrees Celsius per meter. The total air volume rises and the surface heat transfer coefficient decreases as the tunnel’s cross-section increases. For every 10 m increase in the tunnel diameter, the temperature at 800 m from the tunnel face drops by about 0.5 °C. Changing the distance between the air duct and the tunnel face has little influence on the temperature distribution law. The general trend is that the farther the air duct outlet is from the tunnel face, the higher the temperature is, and the maximum difference is within the range of 50 m~250 m from the tunnel face. The maximum difference between the air temperatures at 12 m and 27 m is 0.79 °C. The geological structure and geothermal background have the greatest influence on the temperature prediction of high geothermal tunnels. The prediction results are of great significance for guiding tunnel construction, formulating cooling measures, and ensuring construction safety.https://www.mdpi.com/2075-5309/14/9/2908highway tunnelconstruction ventilationconvective heat transfertemperature fieldnumerical model |
| spellingShingle | Guofeng Wang Yongqiao Fang Kaifu Ren Fayi Deng Bo Wang Heng Zhang Prediction of the Temperature Field in a Tunnel during Construction Based on Airflow–Surrounding Rock Heat Transfer Buildings highway tunnel construction ventilation convective heat transfer temperature field numerical model |
| title | Prediction of the Temperature Field in a Tunnel during Construction Based on Airflow–Surrounding Rock Heat Transfer |
| title_full | Prediction of the Temperature Field in a Tunnel during Construction Based on Airflow–Surrounding Rock Heat Transfer |
| title_fullStr | Prediction of the Temperature Field in a Tunnel during Construction Based on Airflow–Surrounding Rock Heat Transfer |
| title_full_unstemmed | Prediction of the Temperature Field in a Tunnel during Construction Based on Airflow–Surrounding Rock Heat Transfer |
| title_short | Prediction of the Temperature Field in a Tunnel during Construction Based on Airflow–Surrounding Rock Heat Transfer |
| title_sort | prediction of the temperature field in a tunnel during construction based on airflow surrounding rock heat transfer |
| topic | highway tunnel construction ventilation convective heat transfer temperature field numerical model |
| url | https://www.mdpi.com/2075-5309/14/9/2908 |
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