Study on Fire Design in Xuefengshan Highway Tunnel

摘要

The fundamental principle for tunnel fire fighting design is to ensure the safety of people's escape from tunnel fire. Therefore the computer model Tunev (tunnel evacuation) for the people's safe escape was developed. In order to evaluate evacuation safety, Fire risk times Tfire was firstly gotten through simulations of a middle size fire, whose heat release rate (HRR) was 20MW, with a longitudinal velocity of 3m/s suggested in Code for Design of Road Tunnel of 2004, and evacuation times Tevacuate was calculated by an empirical formula in the Togawa evacuation model. Meanwhile, fire spreading to other cars was analyzed by radiation theory. Finally, cross passage spacing was optimized in a method of evacuation safety evaluation. Results are given as follows: Tfire equal to 290s are bigger than Tevacuate equal to 267s, the smallest igniting spacing between cars is 13m, and the optimized cross passage spacing is 290m. All those are shown that: evacuation is safe, and to some extent code is testified correct.