高海拔隧道热固型材料防冻保温层厚度的隔热效果仿真分析
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摘要
在建立隔热层/衬砌/围岩的二维传热学分析模型基础上,基于二维稳态导热有限元分析方法对隧道围岩、衬砌温度场分布进行模拟仿真计算。首先,对地域环境年平均气温-3.5℃条件下,不同设计厚度的热固性隔热料福利凯(FLOLIC FOAM)的防冻保温效果进行了分析;其次,对防冻保温层设计厚度为5 cm且隧道环境温度由-3.5℃下降至-10℃时,单位厚度隔热层防冻保温导致的温差变化及其产生的隔热效果进行了对比;第三,当隧道环境气温从-3.5~-35℃范围变化且隔热层厚度为5 cm时,给出了可达到的防冻保温最低温度范围。
Based on the two-dimension heat transferring analysis model of the anti-freezing insulation layer/lining layer/surrounding rock,the contours of static temperature of surrounding rock and lining of the tunnel model was simulated with twodimension steady-state thermal conductivity finite element analysis method.Firstly,under the condition of the annual average geographical ambient temperature at-3.5 ℃,the anti-freezing insulation effect of thermosetting thermal insulation material FLOLIC FOAM with different designed thickness was analyzed.Secondly,when the designed thickness of anti-freezing insulation layer was 5 cm and the tunnel ambient temperature decreased from-3.5 ℃ to-10 ℃,the temperature difference caused by anti-freezing thermal effect of unit thickness of the thermal insulation layer and its heat insulation effect were compared.Thirdly,when the ambient temperature of the tunnel changed from-3.5 ℃ to-35 ℃ and the thickness of thermal insulation layer was 5 cm,the minimum temperature range of anti-freezing and heat preservation was obtained.
Based on the two-dimension heat transferring analysis model of the anti-freezing insulation layer/lining layer/surrounding rock,the contours of static temperature of surrounding rock and lining of the tunnel model was simulated with twodimension steady-state thermal conductivity finite element analysis method.Firstly,under the condition of the annual average geographical ambient temperature at-3.5 ℃,the anti-freezing insulation effect of thermosetting thermal insulation material FLOLIC FOAM with different designed thickness was analyzed.Secondly,when the designed thickness of anti-freezing insulation layer was 5 cm and the tunnel ambient temperature decreased from-3.5 ℃ to-10 ℃,the temperature difference caused by anti-freezing thermal effect of unit thickness of the thermal insulation layer and its heat insulation effect were compared.Thirdly,when the ambient temperature of the tunnel changed from-3.5 ℃ to-35 ℃ and the thickness of thermal insulation layer was 5 cm,the minimum temperature range of anti-freezing and heat preservation was obtained.
引文
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[5]马建新,李永林,谢红强,等.高寒地区隧道保温隔热层设防厚度的研究[J].铁道建筑技术,2003(6):20-22.MA Jianxin,LI Yonglin,XIE Hongqiang,et al.Study on fortification thickness of tunnel thermal insulation layer in alpine area[J].Railway Construction Technology,2003(6):20-22.
[6]TAN Xianjun,CHEN Weizhong,YANG Diansen.Study on the influence of airflow on the temperature of the surrounding rock in a cold region tunnel and its application to insulation layer design[J].Applied Thermal Engineering,2014,67:320-334.
[2]吴楚钢.新疆天山地区高速公路隧道防冻技术研究[D].重庆:重庆交通大学,2010.WU Chugang.Anti-freezing Technology of Highway Tunnel in Xinjiang Tianshan Area[D].Chongqing:Chongqing Jiaotong University,2010.
[3]解琦徐茂兵.高寒地区隧道冻害防治及保温设计探讨[J].公路,2012(5):325-328.XIE Qi,XU Maobing.Discussion on tunnel frost damage prevention and heat preservation design in alpine area[J].Highway,2012(5):325-328.
[4]刘玉勇.高海拔严寒地区特长公路隧道隔热层敷设材料选型[J].四川建筑,2011,31(6):195-198.LIU Yuyong.Selection of laying material for thermal insulation layer of highway tunnel in high altitude and severe cold area[J].Journal of Sichuan Architecture,2011,31(6):195-198.
[5]马建新,李永林,谢红强,等.高寒地区隧道保温隔热层设防厚度的研究[J].铁道建筑技术,2003(6):20-22.MA Jianxin,LI Yonglin,XIE Hongqiang,et al.Study on fortification thickness of tunnel thermal insulation layer in alpine area[J].Railway Construction Technology,2003(6):20-22.
[6]TAN Xianjun,CHEN Weizhong,YANG Diansen.Study on the influence of airflow on the temperature of the surrounding rock in a cold region tunnel and its application to insulation layer design[J].Applied Thermal Engineering,2014,67:320-334.