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.