摘要
针对川西高海拔隧道防冻保温设计参数取值问题,文章基于10座典型川西高原隧道运营期洞内纵向实测温度数据,对川西高海拔隧道洞内纵向温度特征及防冻参数进行了研究。研究结果表明:川西高原运营期隧道洞内纵向温度分布类型可分为贯通型、弱对称型和非对称型3种;高海拔隧道长度愈长,冬季洞口与洞内的温差越大,川西高原隧道冬季洞口与洞内的最大温差和隧道长度呈线性关系;基于隧道洞口实测温度数据,提出了川西高原隧道洞口保温层铺设厚度的经验计算公式;结合洞口气温和冬季洞口风速等参数对洞口段保温层设防长度进行了综合分析,提出了川西高原长隧道或特长隧道洞口段保温层铺设长度的经验计算公式;川西高原隧道洞口段保温层设计宜采用动态设计方法,条件允许下应根据隧道贯通后实测纵向温度数据进行修正。
In view of design parameters of anti-freezing and thermal insulation for high-altitude tunnels in Western Sichuan Plateau,based on the measured longitudinal temperature data of 10 typical high-altitude tunnels in Western Sichuan,this paper studies the longitudinal temperature characteristics and anti-freezing parameters of high-altitude tunnels in Western Sichuan.The research results show that the longitudinal temperature distribution inside operational tunnels on the Western Sichuan Plateau can be divided into three types:cut-through,weakly symmetrical and asymmetrical;the longer the length of high-altitude tunnels is,the greater the temperature difference between the tunnel portal and the tunnel inside will be in winter season,and the maximum temperature difference inside and outside tunnels in winter is linearly related to the length of the tunnels on the Western Sichuan Plateau;based on the temperature data measured at tunnel portals,this paper puts forward an empirical formula for calculation of the thickness of the thermal insulation layer laid at tunnel portal sections on the Western Sichuan Plateau;combined with parameters such as air temperature and winter wind speed at the portal,this paper conducts a comprehensive analysis of the length of the thermal insulation layer setup at the tunnel portal sections and proposes the empirical formula for calculation of the length of thermal insulation layer laid at the portal sections of long or extralong tunnels on the Western Sichuan Plateau;in terms of the design of the thermal insulation layers at the portal sections of tunnels on the Western Sichuan Plateau,dynamic design methods shall be adopted,and if conditions permit,it should be amended according to the measured longitudinal temperature data after completion of tunnel construction.
作者
郑波
吴剑
郑金龙
匡亮
郭瑞
ZHENG Bo;WU Jian;ZHENG Jinlong;KUANG Liang;GUO Rui(China Railway Southwest Research Institute Co.,Ltd.,Chengdu 611731;Sichuan Provincial Engineering Technology Research Center of Tunnel Safety,Chengdu 611731;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610041;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031)
出处
《现代隧道技术》
CSCD
北大核心
2021年第5期30-36,共7页
Modern Tunnelling Technology
基金
四川省重点研发计划项目(2018GZ0359,2020YFS0500)
四川省交通运输科技项目(2016B2-4)
四川省交通运输发展战略和规划科学研究院科技项目(510201201910982)
中国中铁股份有限公司科技开发计划项目(CZ01-重大-01)。
关键词
川西高原
高海拔隧道
纵向温度
分布类型
保温层
计算公式
Western Sichuan Plateau
High-altitude tunnel
Longitudinal temperature
Distribution type
Thermal insulation layer
Calculation formula
