寒冷地区隧道温度场的变化规律

为了揭示隧道温度场的变化规律,以某寒冷地区公路隧道为依托,选择11个测试断面,对隧道拱顶、拱腰、边墙和路面四个部位的温度进行1.5a的长期测试,采用正弦函数回归法,对测试数据进行分析。结果表明:隧道洞内的年气温变化具有周期性,随时间大致呈正弦曲线变化;隧道内纵向气温随着进入隧道距离的增大,年平均温度逐渐下降,年温度振幅也下降,其变化规律呈指数函数曲线变化关系;隧道围岩温度在径向一定范围内,随着径向深度的增加,年平均温度上升,年温度振幅衰减,并且呈指数函数曲线变化关系;防水夹层对隧道保温隔热是有利的。

Changing rules of temperature field for tunnel in cold area

In order to discove the variation rules of tunnel temperature field,eleven sections of a highway tunnel in cold area were chosen,four positions were confirmed including crown,shoulder,wall and road face,their temperatures were tested in 1.5 a,and test data were analyzed by using mathematical statistic-sine function regression method.The result shows that the variation rule of yearly temperature in tunnel was periodical,basically accords with sine curve;vertical yearly temperature and shake amplitude decrease gradually with the increase of the distance entering into tunnel,and the changing rule was exponent curve;the relation between yearly temperature and radial depth was also exponent curve with in certain area,radial yearly temperature increases,but temperature shake amplitude decreases;water-proof layer was effective against thermal retardation.6 tabs,6 figs,11 refs.