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| Operating Ventilation Technology for Diesel - hauled Train Crossing Extra - long Tunnels in High Altitude Plateau |
| SUN San -xiang，SONG Wen -jing，ZHANG Yun –xia |
| (Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China) |
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Abstract Abstract ：Research purposes： The Penyinla tunnel，in the railway line from Lhasa to Shigatse，is a diesel - hauled， extra - long tunnel with high altitude and extremely cold climate. One deviated well and three cross - holes were built in the process of construction. Under tlie conditions of special climate in tunnel zone from Lhasa to Shigatse，the influence of cross - holes on operation ventilation needs to be studied urgently. Based on detection value of emission index of NJ2 type diesel locomotives and the monitoring results of natural wind， the RNG ! - ! turbulence model was adopted to simulate and analyze the influence of cross - holes on natural ventilation in the Penyinla tunnel. The relationships of natural wind between outside and inside of tunnel，and the influence of thermal pressure on natural wind in the tunnel were confirmed when different cross - holes opening. Research conclusions:( 1 ) The propositional projects for operating ventilation are as follows， the cross - holes numbering 2 ： and 4 ： are proposed as exhaust outlet，the portal to Lhasa，to Shigatse and the cross - holes numbering 3 ： are recommended as air inlets. (2) Combining witli disaster - prevention，the wind direction of chosen jet fan for main tunnels should be same with the train movement. (3) The research results are useful to operation ventilation technology of long tunnel in high altitude area.
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Received: 11 January 2016
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2017, Vol. 34 
