中国铁道科学2025，Vol.46Issue(5)：162-172,11.DOI:10.3969/j.issn.1001-4632.2025.05.14
高地温隧道长距离施工降温供风量计算方法及降温设计研究
Research on Calculation Method and Cooling Design for Cooling Air Supply Volume in Long-Distance Construction of High Geothermal Tunnels
摘要
Abstract
At present,the heat exchange between the duct and the air is not considered during the current calculations of cooling air supply volume for high geothermal tunnel construction,which leads to the shortage of smaller calculation results.First,a method for calculating the cooling air supply volume for high geothermal tunnels is proposed based on finite difference theory and heat transfer principles,taking into account factors such as external ambient temperature of the tunnel,footage,tunnel equivalent radius,and air leakage rate.Then,specific cooling design principles and schemes are established by integrating multiple measures.The results indicate that the error between the calculated results and the on-site monitoring data is 3.78%,verifying the accuracy of the method.The surrounding rock temperature and footage will significantly affect the airflow temperature at the duct outlet,so reducing the heat dissipation of surrounding rock or increasing the airflow volume can both effectively lower the internal ambient temperature of the tunnel.The external ambient temperature of the tunnel has a significant impact on the cooling air supply volume when it exceeds 15℃,and the higher the surrounding rock temperature and the longer the footage,the greater the impact on the cooling air supply volume.It is difficult to achieve good cooling effects only by fan ventilation,and a 3 cm thick insulated air duct can effectively reduce the cooling air supply volume after the footage exceeds 1 000 m.When the footage exceeds 2 000 m or the surrounding rock temperature exceeds 60℃,the priority should be given to the use of insulated air ducts;while when the footage exceeds 3 000 m or the surrounding rock temperature exceeds 80℃,the priority should be given to the use of wall-mounted insulation layers.The proposed cooling design scheme has strong versatility,and can both reduce cooling costs and effectively reduce the required cooling air supply volume.关键词
高地温隧道/有限差分理论/降温供风量/降温设计Key words
High geothermal tunnels/Finite difference theory/Cooling air supply volume/Cooling design分类
交通工程引用本文复制引用
路明,于丽,刘媛,余明阳,周振宇,唐永红..高地温隧道长距离施工降温供风量计算方法及降温设计研究[J].中国铁道科学,2025,46(5):162-172,11.基金项目
国家自然科学基金资助项目(51878567,51878568) （51878567,51878568）
