摘要
依托东梁底隧道通风竖井,对高寒地区通风竖井施工期的温度场进行现场监测,并采用CFD模拟计算的方法对运营期的温度场进行分析,研究不同通风条件下竖井温度场分布规律与防寒保温措施。结果表明:受井底暖回风作用,竖井在施工期受环境低温影响较小,当井底回风对竖井抗防冻有利时,排风井在运营期内也不会出现冻结;在冬季运营通风时,整个送风井背后的围岩出现了不同程度的冻结,冻结深度受通风时间影响较大,受风速影响较小,通风2个月后冻结深度发展趋于稳定;施作保温层能减小运营期围岩温度的变化,综合考虑各种因素,建议该工程在送风井侧施作6 cm厚聚氨酯保温层。
Based on the ventilation shafts in the Dongliangdi Tunnel, on-site monitoring was conducted for the temperature field during the construction of ventilation shafts in a high-altitude and cold region, and the method of CFD simulation calculation was used to analyze the temperature field during the operation and to research the distribution pattern of the temperature field of shafts under different ventilation conditions and the cold-proof and thermal insulation measures. The analysis results showed that the impact of low ambient temperature on shafts during construction was relatively small due to the warm return air at the bottom of shafts, and when the return air at the bottom of shafts was beneficial to anti-freezing of shafts, exhaust shafts would also not be frozen during the operation. The surrounding rocks behind the whole blowing-in shaft were frozen to different degrees during operation and ventilation in winter, and the depth of frost was greatly affected by the time of ventilation and less affected by the velocity of wind, and the development of depth of frost became stable after 2 months of ventilation;the construction of insulation layers could reduce the changes in the temperature of surrounding rocks during operation, and after comprehensively considering various factors, it is recommended to pave a 6 cm-thick polyurethane insulation layer on the blowing-in shaft side of the project.
作者
王建军
杨林霖
杨文波
张逸飞
WANG Jianjun;YANG Linlin;YANG Wenbo;ZHANG Yifei(China Railway Tunnel Group No.2 Engineering Co.,Ltd.,Langfang 065000;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031)
出处
《现代隧道技术》
CSCD
北大核心
2022年第4期118-126,共9页
Modern Tunnelling Technology
关键词
通风竖井
高寒地区
温度场
防寒保温措施
Ventilation shaft
high-altitude and cold region
temperature field
anti-freezing and thermal insulation measures
