High temperature–humidity environment is one of the severe challenges in constructing Sichuan–Tibet railway tunnels.For enhancing construction efficiency and guaranteeing tunnel worker safety,addressing the high tem...High temperature–humidity environment is one of the severe challenges in constructing Sichuan–Tibet railway tunnels.For enhancing construction efficiency and guaranteeing tunnel worker safety,addressing the high temperature–humidity environment has irreplaceable significance.This study innovatively investigated the distribution law and evolution process of the thermal–humidity coupling field dur-ing tunnel construction.Besides,the corresponding ventilation measures were proposed based on the evaluation heat index(HI).If the initial temperature of the surrounding rock is constant,the distance between the ventilation duct outlet and the tunnel working face should not be greater than 30 m.Otherwise,the cooling performance of ventilation will be significantly weakened;If this temperature ranges in 65–85℃,the recommended ventilation velocity is 10–25 m/s,and the ventilation distance should not exceed 20 m.The con-clusions in this study are beneficial to better understand the high temperature–humidity environment in tunnel construction and can be a guideline for practical engineering application.展开更多
基金the National Natural Science Foundation of China(Grant No.52038009),and one anonymous reviewer is acknowledged for the valuable comments.
文摘High temperature–humidity environment is one of the severe challenges in constructing Sichuan–Tibet railway tunnels.For enhancing construction efficiency and guaranteeing tunnel worker safety,addressing the high temperature–humidity environment has irreplaceable significance.This study innovatively investigated the distribution law and evolution process of the thermal–humidity coupling field dur-ing tunnel construction.Besides,the corresponding ventilation measures were proposed based on the evaluation heat index(HI).If the initial temperature of the surrounding rock is constant,the distance between the ventilation duct outlet and the tunnel working face should not be greater than 30 m.Otherwise,the cooling performance of ventilation will be significantly weakened;If this temperature ranges in 65–85℃,the recommended ventilation velocity is 10–25 m/s,and the ventilation distance should not exceed 20 m.The con-clusions in this study are beneficial to better understand the high temperature–humidity environment in tunnel construction and can be a guideline for practical engineering application.
