Study On The Technology Of Operation Ventilation And Disaster Prevention Of Guanjiao Railway Tunnel

Guanjiao super-long railway tunnel is unusual at high altitudes in the world, there is a lack of experience at operation ventilation and disaster prevention of super-long railway tunnel at high altitudes. Compared with usual tunnels, Guanjiao tunnel has its characteristics, such as accumulation of contamination in tunnel, the length of fresh air brought in by train piston wind, the utmost length of tunnel ventilation, the efficiency of ventilation, disaster prevention and relief problems, and so on.The author of this issue undertook a survey of field measurement data refer to accumulation of contamination in operated tunnels in the world. In order to fill up the vacant in the standard in existence at high altitudes, this thesis aims at put forward a set of recommendations of air circumstance and harmful gases emission control regulations in operated tunnels at high altitudes, especially in Guanjiao tunnel. It is indicate that harmful gases and soot concentration emitted by engine increase at high altitudes, and the harm to body of pollutes is more severe.This thesis makes scientific researches on the effect of natural wind and piston wind in Guanjiao tunnel according to its actual meteorological circumstance. Utilizing 3D numerical simulation and ventilation net work theory based on ventilation calculating model of Guanjiao tunnel, through comparison optimization to figure out a set of problems such as the utmost length of electric railway tunnel ventilation and the mechanical ventilation settings in operation phases of Guanjiao tunnel. Through numerical simulation calculation, deciding fresh air exchanges rates and optimal installation of jet fans in Guanjiao tunnel.As to disaster prevention and relief of Guanjiao tunnel, using numerical simulation software to simulate the fire scenarios and personnel evacuation under different conditions, summarizing the development law of fire under different fire scale with different evacuation adits, to ascertain whether the existing disaster prevention and relief design of Guanjiao tunnel can meet the need.