河南城建学院学报2023，Vol.32Issue(6)：45-52,88,9.DOI:10.14140/j.cnki.hncjxb.2023.06.007
寒区隧道保温层设置及保温效果数值模拟分析
Numerical simulation analysis of insulation layer setting and insulation effect of tunnels in cold regions
摘要
Abstract
In cold regions,the insulation layer plays a vital role in preventing tunnels from freezing.In order to study the design structure of the insulation layer suitable for tunnels in high-altitude cold areas,a two-dimen-sional temperature field calculation model containing phase changes was established through finite element nu-merical simulation software to study the laying method,design thickness,thermal conductivity of the insulation layer of Duolong Tunnel in Qinghai Province,as well as the optimal selection of different insulation materials.The results show that:(1)for the arch feet and inverted arches,the insulation effect of double-layer laying and interlayer laying is better than that of surface laying,and for the vault,all three laying methods can effectively avoid freezing damage.(2)when the annual average temperature is greater than 0 ℃,the insulation layer thickness should be 5～9 cm;when the annual average temperature is less than 0 ℃,the optimal insulation layer thickness is 13 cm.(3)within ten years of operation of the Duolong Tunnel,when the insulation layer thickness is 5 cm,and the thermal conductivity of the insulation layer is 0.03 W/m·℃ and below.it can a-void freezing damage to the lining.(4)through comparative analysis of the surface temperatures of tunnel walls with and without insulation materials,as well as quantitative analysis of the insulation effects of different insula-tion materials,it was found that the rigid polyurethane insulation board had the best insulation effect,followed by phenolic foam plastic,and foam glass had the worst insulation effect.关键词
寒区隧道/保温层/保温效果/防冻抗冻/数值模拟Key words
tunnels in cold regions/insulation layer/insulation effect/anti freezing/numerical simulation分类
交通工程引用本文复制引用
郭硕栋,王晓川,张耀阳,陈泽盟..寒区隧道保温层设置及保温效果数值模拟分析[J].河南城建学院学报,2023,32(6):45-52,88,9.基金项目
中交二公局局级重点课题(22020-4-17) （22020-4-17）
