Research On Technique Of Preventing Frost Damage In Tunnel At Cold Area

As the rapid development of our country's highway, and the implementation of the state's the policy of the Great Development of the Western Regions and the northeast old industrial base promotion, a lot of tunnels will be built in elevations areas or circumpolar areas in the big west. These tunnels suffer easily cold damages. Cold damages of the lining surface, peeling off, ice covering, watering and freezing of the road surface in tunnels have been greatly weakening the service capacity and life. The managers cost a lot for the cold damage control project, but the result doesn't satisfying. Aiming at the present situation, taking Jilin XinJiaoDong tunnel as actual background, this paper studies on the problem of heat preservation and antifreeze in the tunnel in cold areas.On the base of investigating and analyzing all kinds of anti-freezing measurements applied in the worldwide, by means of monitoring and analyzing of temperature field and characters of cold damages mechanics, discovered all kinds of the reasons of cold damages. Moreover, aiming at characters of highway tunnels in cold areas, this paper puts forward comprehensive heat preservation and antifreeze measures by the most of waterproof and drainage. Besides, new waterprofing and drainage measures such as the drain availeable waterstop with no-joint assembly and verticval wave drainage pipes have already been applied in xinjiaodong tunnel in jilin province, these have good result by examination.It has a certain reference for new tunnels in cold areas.This article also determine the thickness formula of the insulation layer according to the principle of heat conduction after calculation agsinst temperature distribution in xinjiaodong tunnel, and using an example to verify the formula. Taking xinjiaodong tunnel for example, distribution of temperature field of tunnel rock is studied by using ANSYS finite element analysis software, the insulation measures the scheme is used that only in key areas-circumferential tunnel construction joints on both sides of the corner need for insulation, this is of great practical significance.