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| Comparative study on the cooling effect of ice block and ventilation combination in high ground temperature tunnel construction |
| LIU Xiangyang1, LUO Bingbing2, WU Jing1, ZHANG Xuefu2, HUANG Yaoming1, LI Linjie2*
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1. The Fourth Engineering Co., Ltd. of CCCC First Highway Engineering Co., Ltd., Nanning 530031, Guangxi, China;
2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China |
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Abstract Inorder to solve the heat damage caused by high temperatures in construction tunnels at high temperatures, based on the construction of the Jianshui(Gejiu)to Yuanyang section of the Honghe Hani and Yi Autonomous Prefecture in Yunnan Province, the temperature field of the tunnel under ventilation and ice cooling was numerically simulated using CFD software to compare and analyze the effect of cooling measures on the Nige Tunnel. Fluent was mainly used to establish a ventilation model for construction tunnels. Under the same air volume, a comparative analysis was conducted on the cooling effects of two ventilation methods combined with ice cooling under different ventilation air volumes. The results showed that when the surrounding rock temperature was 45 ℃, for the two ventilation and cooling methods assisted by ice, arch top pressure ventilation and side wall ventilation could not effectively control the air cooled by ice blocks near the palm face. Cold air was easily carried away by the return air, and the reduced temperature was not easy to maintain. On the other hand, wind curtain ventilation could control the low-temperature air cooled by ice blocks near the palm face, and the wind curtain ventilation method could reduce the temperature near the palm face by 3~5 ℃ more than the pressure ventilation method, and the cooling range was wider and more stable, with a more significant cooling effect.
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Published: 28 June 2024
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