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| Comparative study on the cooling effect of ice block and ventilation combination in high 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 In order 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. The common arch pressure ventilation and sidewall ventilation couldn't effectively control the air cooled by ice blocks near the palm surface. Cold air was easily carried away by the return air, making it difficult to maintain the lowered temperature. On the other hand, wind curtain ventilation could control the low-temperature air cooled by ice blocks near the palm surface, resulting in better cooling effects. This article mainly used Fluent 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 blocks 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 blocks, the wind curtain ventilation method reduced 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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Received: 11 April 2024
Published: 14 June 2024
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