Study Ondisaster Prevention And Rescue Technology Of Extra-long Road Tunnel With The Twin-tube Complementary Ventilation

With the rapid development of highway tunnels construction, lots of extra-long highway tunnel has been established and there has being some new design concept and structural form in the field of highway tunnel ventilation. At the same time, the difficulty of the tunnel disaster prevention and rescue are also increasing.The article depends on scientific research project of Gansu province bureau "the extra-long highway tunnel ventilation research and key technology of twin-tube complementary ventilation ". Based on theoretical analysis, numerical method and the physical model test method,the article has studied the worst fire disaster prevention and rescue on the condition of the twin-tube complementary ventilation. The main findings are as following:(1) According to the theory analysis, it calculates the full jet to the maximum length which applicable to the longitudinal ventilation, determines the West qinling tunnel longitudinal ventilation scheme selection full jet ventilation on the basis of recent, and the necessity of using twin-tube complementary ventilation in long-term.(2) According to the numerical simulation research, finds that the most unfavorable conditions, when tunnel portal of jet fan are in vehicle retarding and horizontal channel (pedestrian and dealership horizontal channel) open conditions, has a great deal of instability, what is more, may result in flue gas countercurrent.(3) According to the physical model test study, the personnel life safety as the priority principle, under a state of emergency,should open the ventilation system of Air outlet, so as to prevent reverse flow of flue gas and kill the people.(4) Based on numerical simulation and physical model test method, research has shown that if a tunnel wind speed can stop the flue gas flow, then close the ventilation system.(5)when there is a fire,the disaster relief system’s performance under the way of the twin-tube complementary ventilation is very critical. The article gets the pedestrian cross channel and dealership cross channel open romantic role inside the tunnel through studies, and puts forward about the worst fire location discusses relief Suggestions in case of an emergency.(6) Based on the numerical method and the physical model test method, the article gets the development law of most unfavorable position under the twin-tube complementary ventilation method. Proposing the near future, West qinling tunnel fire under the condition of disaster prevention and rescue measures.This thesis mainly studies the ventilation system when a fire rescue strategy on the condition of the twin-tube complementary ventilation. At the same time, provides reference for the similar extra-long twin-tube complementary ventilation tunnel in working ventilation system of disaster prevention and rescue.