风流对寒区特长隧道洞内纵向温度场的影响
Influence of Wind Flow on Temperature Fields of Extra-Long Tunnels in Cold Regions
吴剑 1郑波 1陶伟明 2袁明 3郭瑞1
作者信息
- 1. 中铁西南科学研究院有限公司,四川 成都 611731
- 2. 中铁二院工程集团有限责任公司,四川 成都 610031
- 3. 中铁投资集团有限公司,北京 100055
- 折叠
摘要
为揭示自然风流对寒区隧道洞内温度场的影响,以川西高海拔公路隧道为工程依托,基于现场调研、实地测试和数值模拟,分析洞内风流对未贯通隧道和已贯通运营隧道温度场的影响.研究表明:1)施工过程中,机械通风对施工期隧道洞内温度场的影响较大,加大了洞外冷空气对洞内温度场的影响,使得洞内负温段有所延长;2)单向风流作用下,贯通隧道洞内温度场具有进风口端温度低、出风口端温度偏高的特征,纵向温度场具有非对称性特征;3)对于寒区特长运营隧道,在洞内无风或有微弱风流的情况下,外界冷空气很难影响到洞内温度场;4)洞内存在双向交替风流时,贯通隧道洞内温度一般呈现出洞口低、中间区域高的特征,纵向温度场呈现抛物线形的特征.
Abstract
The distribution characteristics of the temperature fields in extra-long tunnels in cold regions are closely related to natural wind speed.A case study is conducted on a highway tunnel in western Sichuan in a high-altitude area,and on-site investigations,evaluations,and numerical simulations are used to examine the influence of wind flow on the temperature fields of tunnels under construction and penetrated and operating tunnels.The findings are as follows:(1)During tunnel construction,mechanical ventilation significantly impacts the temperature field in the tunnel,increasing the influence of cold air outside the tunnel on the temperature field inside and extending the negative temperature length in the tunnel.(2)Under unidirectional airflow,the temperature field in the operating tunnel is low at the tunnel inlet end and high at the outlet end.The longitudinal temperature field presents asymmetric characteristics.(3)For long operating tunnels in cold regions,the cold wind outside the tunnel does not affect the temperature field in the tunnel when there is no wind or a gentle breeze.(4)When there is alternating airflow at the tunnel entrance,the temperature in the penetrated tunnel is generally low at the entrance and high in the middle area,and the longitudinal temperature field frequently presents a parabolic shape.
关键词
寒区隧道/自然风/温度场/单向通风/防冻设计Key words
tunnels in cold regions/natural wind/temperature field/unidirectional ventilation/antifreeze design引用本文复制引用
基金项目
四川省自然科学基金项目(2024NSFSC0158)
中国中铁股份有限公司科技开发计划项目(2021-重大-19)
中国国家铁路局集团有限公司科技研究开发计划项目(N2021G057)
出版年
2024
NETL
NSTL
万方数据