Highway Tunnel Reasonable Lining Section Type Test

This paper selects Qingtuxian loess highway tunnel as relying engineering and takes field observation synthetically. The field observation pays more attention to research on the change regulations of pressure acting on first lining and invert,axial force of lattice girder,contact stress between first and second lining,concrete strain of second lining verse the time and distributions in different positions. This paper researches the stress properties of the different initial stress of three different kinds of lining sectional forms (i.e. single-center circle.three-center sharp circle,three-center tabular circle) which with satisfying demands in building clearance,ventilation and so on throng the modeling tests in lab.This paper analyses the influences of initial stress and lining sectional forms onperformances of lining.With the help of finite element method program the paper makes a simulative analysis of of the sress properties of three different kings of lining sectional forms and researches the effect of the thickness of lining on properties of lining structure.On the basis of fieldobservation,modeling test and simulation analysis,this paper point out a rational lining sectional form to highway tunnel in the loess.