摘要
目的常规的隧道冷负荷预测方法不适用处于高地温极端环境的川藏铁路隧道,亟须开展相关研究。方法以川藏铁路色季拉山隧道为背景,建立热湿耦合的多孔介质模型,分析围岩渗流水、保温层、送风速度和温度等对隧道温度场的影响。结果保温层可以显著降低隧道空气温度,含水围岩的隧道有效通风距离提高了5.87%,固体围岩的有效通风距离增加了25.51%,增加保温层厚度并没有显著降低隧道温度;围岩温度和送风速度对隧道温度有显著影响,围岩温度决定了隧道温度的上限;送风速度从1 m/s分别增加到2、3 m/s,隧道温度分别降低20.53%、24.83%;各因素对隧道温度场强度影响由大到小依次为围岩温度、送风速度、送风温度、保温层厚度。结论围岩温度决定了隧道的温度上限和降温难度,增加保温层厚度降温效果不明显,提高送风速度可以显著降低隧道温度。
Conventional tunnel cooling load prediction methods are inadequate for the high geothermal extreme conditions of the Sichuan-Xizang Railway tunnels,creating an urgent need for new predictive methods and research.Using the Sejila Mountain Tunnel of the Sichuan-Xizang Railway as a case study,a thermal-humidity coupled porous medium model was developed to assess the effects of surrounding rock seepage water,insulation layer,and air supply velocity and temperature on the tunnel temperature field.The insulation layer significantly lowers the tunnel air temperature.The effective ventilation distance increases by 5.87%in tunnels with water-containing surrounding rock and by 25.51%in tunnels with solid surrounding rock.Increasing the insulation layer′s thickness does not significantly lower the tunnel temperature;however,the surrounding rock temperature and air supply velocity have a considerable impact on it.The surrounding rock temperature sets the upper limit for tunnel temperature.When the air supply speed increases from 1 m/s to 2 m/s or 3 m/s,the tunnel temperature decreases by 20.53%or 24.83%,respectively.The factors influencing the intensity of the tunnel temperature field,in order of impact,are surrounding rock temperature,air supply speed,air supply temperature,and insulation layer thickness.The surrounding rock temperature sets the upper temperature limit and affects the cooling challenge of the tunnel.Increasing the insulation layer′s thickness has little effect,while the air supply velocity can significantly reduce the tunnel temperature.
作者
冯国会
李兆星
孙佳琳
黄凯良
FENG Guohui;LI Zhaoxing;SUN Jialin;HUANG Kailiang(School of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang,China,110168)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2024年第6期1047-1053,共7页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金重点项目(52038009)
辽宁省教育厅基本科研项目(LJKMZ20220935)。
关键词
高地温铁路隧道
热湿耦合
多孔介质
温度场分布
敏感性分析
high geothermal railway tunnel
heat and humidity coupling
porous medium
temperature field distribution
sensitivity analysis
