地面表层温度场及隧道排水沟埋置深度设计探讨

Study on Temperature Field of Ground Surface and Discussion of Tunnel Centre Drains Depth Design in Cold Region

在寒冷地区的交通土建工程中,冬季地层的最大冻结深度是一项重要的设计参数。论文通过分析地面表层传热的条件及特点,以一维热传导方程为基础,给出了地表传热模型在定解条件下的解析解,通过编程计算、分析得到地表温度场的变化规律。针对公路隧道设计细则(JTG/T D70—2010)中中央排水沟埋置深度设计参数不明确,提出采用:中央排水沟上部岩土体的总导温系数、年平均气温、地表温度年振幅三个参数进行中央排水沟设计,并给出了查询表格。

Maximum freezing depth is an important designing parameter of transportation constructions in cold region. On the basis of one dimension thermal conductive equation,the paper comes up with a thermal conductive model and its analytical solutions to certain boundary conditions. By means of computer programming,the analysis of the variability of surface temperature field is made. According to Guidelines for Design of Highway Tunnel（ JTG / T D70—2010）,there is no clear designing parameter for depth of center drains of tunnel in cold region,we suggest that multiple thermal conductive coefficient,the average annual temperature and annual temperature amplitude of surface are available for centre drains design,and accordingly a data query table is provided.