摘要
为解决引水隧洞在冬季洞口段的成雾问题,保证施工运输及行车安全,依托引汉济渭秦岭引水隧洞工程,通过对起雾隧洞内的空气温度和空气相对湿度进行现场测试,分析了引水隧洞斜井洞口段雾气形成的影响因素,并结合FLUENT三维数值计算模型对不同温湿度条件下引水隧洞斜井洞内雾气的分布规律进行研究。结果表明:该引水隧洞斜井洞内以大量施工形成的灰尘作为凝结核依托,空气在斜井洞内的运移过程中增湿降温,相对湿度增加至100%后形成雾气,影响雾气形成的主要因素为空气的温度和湿度;斜井洞内初始风流温度越大起雾段长度越小,当洞内初始风流温度为25℃时斜井洞内基本不产生雾气,当风流温度为18.1℃时斜井洞内雾气的分布范围为0~850 m;斜井洞内初始风流相对湿度越大起雾段长度越大,当洞内初始风流相对湿度为89.4%时斜井洞内雾气分布范围较短为0~85 m,当洞内初始风流相对湿度较高为97.3%时斜井洞内雾气分布范围为0~750 m。通过对引水隧洞斜井洞内空气的升温除湿能缓解洞口段雾气现象的形成。
In order to solve the fogging problem of the water diversion tunnel at the entrance in winter and to ensure the safety of construction,transportation and traffic,relying on the Hanjiang-to-Weihe river water transfer project,this paper carries out field tests on the air temperature and air humidity in the fogging tunnel,analyzes the influencing factors of the fog formation at the entrance section of the inclined shaft in the water diversion tunnel,and combines FLUENT,a three-dimension numerical calculation model,to study the distribution of fog in the cave under different temperature and humidity.The research shows that the dust formed by a large number of constructions in the inclined shaft of the water diversion tunnel forms condensation nuclei with higher humidity and lower tempreture during the migration process in the inclined shaft.When the relative humidity increases to 100%,fog is formed.The main factors affecting the formation of fog are air temperature and humidity.The larger the initial wind temperature in the inclined shaft is,the smaller the length of the fog is.When the wind temperature in the inclined shaft is 25℃,no fog is generated in the inclined shaft.The distribution length of fog in the inclined shaft is 850 m when the wind temperature is 18.1℃.When the relative humidity of the initial air flow in the inclined shaft is higher,the length of the fogging section is larger.When the humidity of the initial air flow in the inclined shaft is 89.4%,the distribution range of fog formation in the inclined shaft is 0~85 m,and when the humidity of the initial air flow is higher than 97.3%,the distribution range of fog formation in the inclined shaft is 0~750 m.The warming and dehumidification of the air in the inclined shaft can alleviate the formation of the fog phenomenon in the inclined shaft.
作者
薛永庆
吕二超
王峰
朱磊
罗飞宇
XUE Yongqing;LYU Erchao;WANG Feng;ZHU Lei;LUO Feiyu(China Railway 18 Bureau Group Tunnel Engineering Co.,Ltd.,Chongqing 400707,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031)
出处
《安全与环境工程》
CAS
北大核心
2020年第2期190-195,203,共7页
Safety and Environmental Engineering
基金
国家自然科学基金项目(51678493)。
关键词
引水隧洞
雾气
分布规律
影响因素
water diversion tunnel
fog
distribution law
influencing factor
