摘要
为更有效地对寒区隧道排水沟冻害进行防治,通过实测虎峰岭隧道和治山隧道纵向温度分布,基于工程实际建立了排水沟温度场数值模拟模型,分析了排水沟壁面温度分布规律,提出了排水沟冻结区段预测方法。结果表明:隧道保温边沟和保温中心排水沟易发生冻结,其中保温边沟冻结问题是寒区隧道冻害设防中应关注的重点;温度短周期波动对排水沟温度场的影响随着深度增加逐渐减弱;在极端低气温条件下,虎峰岭隧道和治山隧道全隧道可能会出现保温边沟冻结的情况,虎峰岭隧道距进口1000~3000 m范围的保温中心水沟为易冻结部位;排水沟内流量越大,冻结区段就越短,且冻结长度受季节变化影响,同一洞内气温条件下,降温季节冻结区段长度小于升温季节。
To more effectively prevent and control freezing damage in tunnel drainage ditches located in cold regions,temperature measurements were conducted in the Hufengling Tunnel and Zhishan Tunnel using a temperature recorder.This allowed for the determination of the longitudinal temperature distribution within both tunnels.A numerical simulation model of the temperature field in the drainage ditch was developed using ANSYS numerical simulation software.This model facilitated the analysis of the temperature distribution on the wall surface of the drainage ditch.Based on the temperature field within the tunnel and the freezing conditions of the drainage ditch,a prediction method for identifying freezing sections of the drainage ditch has been proposed.The results indicate that both the tunnel heat preservation side ditch and the heat preservation center drainage ditch are susceptible to freezing.Moreover,the freezing issues related to the heat preservation side ditch should be prioritized in frost protection strategies for tunnels in cold regions.The impact of short-term temperature fluctuations on the temperature field of the drainage ditch diminishes with increasing depth,ultimately exerting no influence on the temperature at the bottom of the tunnel drainage ditch.In extremely low-temperature conditions,both the Hufengling Tunnel and Zhishan Tunnel may experience freezing throughout their entire length within the heat preservation side ditch.The heat preservation center ditch within 1000 m to 3000 m from the entrance of the Hufengling Tunnel is particularly susceptible to freezing.Additionally,a higher flow rate in the drainage ditch correlates with a shorter freezing section,and the length of freezing is influenced by seasonal variations.Under identical temperature conditions in the tunnel,the length of the freezing section during the cooling season is shorter than that in the heating season.Based on the prediction results,measures can be taken to protect the more susceptible areas in advance,thereby preventing free
作者
许鹏
杨瑞松
刘平飞
马振硕
XU Peng;YANG Ruisong;LIU Pingfei;MA Zhenshuo(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2024年第12期4608-4616,共9页
Journal of Safety and Environment
基金
国家自然科学基金项目(52368056)
中国铁路总公司科技研究开发计划项目(K2018G019)。
关键词
安全工程
排水沟
温度场
冻害
预测方法
safety engineering
drainage ditch
temperature field
freezing damage
prediction method
