Research on Ventilation Methods for the Construction of a Special Long Railway Tunnel with an Oblique Shaft Turning into a Main Tunnel
In order to study the optimal ventilation method for railway tunnel construction,this article takes one tunnel as a supporting project,selects the optimal ventilation method by comparing the required fan power and expected power consumption of different ventilation methods,and uses Fluent software to calculate the numerical value of the optimal ventilation scheme,thereby obtaining the migration law of air flow with the distance from the palm face.After comparing and calculating the ventilation schemes,it was found that the optimal ventilation method is the high-power series pressure type.Among them,No.3 oblique shaft work area requires 132×2kW power fan,No.4 oblique shaft work area requires 110×2kW power fan.The longitudinal wind speed changes in the oblique shaft section and the main tunnel section of No.3 and No.4 oblique shafts first increase,then decrease and finally stabilize.The selected fan model can meet the ventilation requirements.When the diameter of the wind belt is too large,it will increase ventilation resistance and also affect the passage of the lining trolley.Considering the actual construction situation of the tunnel,it is advisable to choose a wind belt diameter of 1.8m for the oblique shaft section of the No.3 oblique shaft work area,and a wind belt diameter of 2m for the main tunnel section.It is advisable to select a diameter of 1.8m for both the oblique shaft section and the main tunnel section of the No.4 oblique shaft work area.
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