Study On The Large Longitudinal Slope Tunnel Ventilation Problem Based On Xiangtan Zhaohua Xiangjiang Tunnel

In recent years, with the development of science and technology, tunnel industrytechnology is also advanced, it has now from flat to the long, steep and complexstructure.When the tunnel can adapt to more and more landform, it also has broughtmany new problems and challenges.And now, how to solve these problems becomethe topics that expert scholars always discussed.and their contains the tunnelventilation problems.With the developing of the tunnel research,experts and scholarsfound that the tunnel ventilation impact the tunnel environment violently.Theproportion of tunnel ventilation in the tunnel design is becoming larger.Tunnelventilation mainly contains operation ventilation and disaster prevention ventilation.operation ventilation can guarantee the tunnel internal environment well when tunneloperations. disaster prevention ventilation will control the fire disaster, and help thosetrapped people out of danger.It will huge impact the tunnel operation environment,disaster prevention, construction cost and operation cost, etc. How to arrange thetunnel ventilation reasonable, is the key of my paper.Base on Hunan Zhaohua Xiangtan Xiangjiang tunnel, Mainly use the theoreticalanalysis and CFD numerical simulation technology, carried out the analysis andresearch about the longitudinal grade highway tunnel are as follows:1, Based on theoretical analysis and research, to find the main influence factorsof the large longitudinal slope tunnel operating environment, and based on the tunnelventilation, to research the maximum longitudinal slope, longitudinal slope degreesand the speed limit of the tunnel.Put forward some suggested about the tunnel lengthincreases.2, Based on3D model of Xiangtan Zhaohua Xiangjiang tunnel, use CFDnumerical simulation analysis, to simulation the tunnel fire smoke flow,and find therule of longitudinal slope tunnel fire smoke flow and find mechanic wind speed,thatcan control the smoke flow.3, Use CFD numerical simulation analysis,to simulation the tunnel fire smokeflow’s temperature distribution, and find the rule of longitudinal slope of tunnel firesmoke flow temperature change, in order to facilitate the evacuation of trappedperson. 4, Use CFD numerical simulation analysis,to find out the critical wind speed oftunnel fire,those base data can be used for the design of tunnel fire ventilation.