Research On The Temperature Field Of Tunnel Built In Cold Area

With the national policies' implementation of the western region development and the northeast old industrial base promotion, the large-scale infrastructure will arrive a new peak-period in the next 20 years. So, as the No.1 task of economic development, traffic construction, will be accelerated in the mountainous north- east and northwest region of China , out of question, more and more long tunnels will be built in these cold areas. But at present, the tunnels built in the cold areas have encountered many kinds of disasters, such as peeling off, the fracture on the lining surface, seepage, ice covering, the tunnel face wall friendly sinking, slippery collapse, tilts, the tunnel freeing port freezing, and so on, which result from the existence of seasonal thawing and freezing in the concrete and rock surrounding the tunnel. All of such disasters not only affect the tunnels to be artistic, and threaten their service capacity.As we all know, the only reason of all these damages is the existence of negative temperature area in the concrete and the rock surrounding the tunnel. There- fore ,only on the basis of the truly understanding to the tunnel temperature field distribution, can we carry on the effective cold-resistance design to the cold local tunnels, reduce the cold plant diseases to the lowest level, achieve maximal ratio of the profit to the investment, and reduce or avoid the tunnels' later period maintenance costs. This paper researches on the concrete and the rock temperature field of Qing Shashan tunnel, as the longest road tunnel in Qinghai province, which lies in the high altitude and low-temperature zone. The main research content includes: (1) accomplishing the tunnel area atmospheric temperature and tunnel environmental temperature test and analysis, summing up the tunnel environmental temperature change characteristics, achieving the change relationship of the tunnels environmental temperature and tunnel atmospheric temperature in order to provide the theoretical and practical information for the temperature field simulation. (2) correctly obtaining the rock's heat conduction...