自然气压差对寒区隧道气温场影响主导性研究  

Research on the Dominant Effect of Natural Pressure Difference on Temperature Field of Tunnel in Cold Regions

作　　者：马志富 杨昌贤 MA Zhifu;YANG Changxian(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道工程学报》2021年第10期60-65,共6页Journal of Railway Engineering Society

基　　金：中国国家铁路集团有限公司科技研究开发计划课题(K2019G042);中国国家铁路集团有限公司科技研究开发计划课题(K2019G040);中国铁路设计集团有限公司科技开发课题(2019YY120301)。

摘　　要：研究目的:寒区隧道洞内温度场分布规律的研究是寒区隧道抗防冻技术的关键。实践经验表明,影响寒区隧道洞内温度场分布的因素包括隧道洞口的相对高差、平面线形,冬季主导风向与线路走向的关系、区域自然风速、围岩地温场、渗流场,列车活塞风作用等,但对于主导性因素尚未形成统一的认识。本文结合寒区隧道温度场分布的研究现状,选择东北高纬度寒区的2座运营长大铁路隧道开展洞内气温测试,分析寒区隧道洞内温度场的变化规律,以期确定影响寒区隧道洞内温度场分布的主导因素。研究结论:(1)冬季寒区隧道内温度沿纵向分布呈“两端洞口低、洞身相对高”的抛物线型,气压相对高(海拔相对低)的洞口负温影响段长度明显大于气压相对低(海拔相对高)的洞口段;(2)隧道两端洞口相对高差引起的自然气压差是影响隧道内纵向气温场分布的主导因素;(3)本研究成果可为寒区大高差隧道抗防冻设计提供参考。Research purposes:The research on the distribution law of temperature field is the key technology of anti-freezing technology of tunnels in cold regions.Experience in tunnel engineering indicate that the factors affecting the temperature field distribution of tunnels in cold regions include the relative elevation difference of the tunnel entrance,horizontal alignment,relationship between dominant wind direction and line trend in winter,regional natural wind speed,geothermal field of surrounding rock,seepage field,train piston wind action,etc.However,a unified understanding of the dominant factors has not yet been formed.Combined with the research status of tunnel temperature field distribution in cold regions,two operating long railway tunnels in Northeast high latitude cold area are selected to carry out temperature test,the variation law of temperature field in cold regions tunnel is analyzed to determine the leading factors affecting the temperature field distribution of tunnels in cold regions.Research conclusions:(1)In winter,the tunnel temperature in cold regions is distributed longitudinally in a parabolic shape of"temperature in two entrances is low and in tunnel trunk is high".The length of the negative temperature affected section of the entrance with relatively high air pressure(relatively low altitude)is significantly longer than that of the entrance with relatively low air pressure(relatively high altitude).(2)The natural pressure difference caused by the relative elevation difference between the two entrances is the dominant factor affecting the longitudinal temperature field distribution in tunnel.(3)The research results can provide reference for anti-freezing design of large elevation difference tunnel in cold regions.

关 键 词：寒区隧道 温度场分布 主导因素 气压差 

分 类 号：TU47[建筑科学—结构工程]