Optimizing the cooling method and parameters for high geothermal tunnel construction by using model experiment

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Tunnelling and Underground Space Technology Pub Date : 2025-02-26 DOI:10.1016/j.tust.2025.106495

Heng Zhang , Bo Wang , Yiqi Zhao , Zelin Zhou , Xinrong Tan , Long Xiang , Yi Feng

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Abstract

High temperature environment during tunnel construction not only causes concrete cracking in the lining structure, but also poses a threat to the safety and health of on-site workers. This paper aims to study the cooling measures and effects of high-temperature tunnel construction environment, explore its characteristics and determine the design parameters. Based on 1:8 scaled model testing platform, the influence of key ventilation parameters on the temperature drop characteristics of tunnels was first studied. Meanwhile, the change of flow rate and injection angle on the temperature field in the tunnel during the spray cooling measures is analyzed. The results show that the wind speed mainly affects the starting cooling moment of each tunnel section, the wind temperature mainly affects the cooling efficiency of the tunnel section. Due to the fact that the evaporation process of fog droplets mainly occurs behind the nozzle, the tunnel area located behind the nozzle position is greatly affected by flow rate changes.The cooling efficiency is ranked from high to low as follows: the tunnel drainage area behind the nozzle > the tunnel drainage area before the air duct outlet > the tunnel drainage area between the two positions.For areas close to the working face, the cooling efficiency increases with the increase of spray angle, while for sections far from the working face, the cooling efficiency decreases with the increase of spray angle.

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.