Research on Optimization of Ventilation Plans of Single Track Extra Long High-speed Railway Tunnel Inclined Shaft with Long Distance and Multiple Working Faces
The Mabaishan Tunnel in the Qinling Mountains is an extra-long double-hole single-line high-speed railway tunnel.No.2 inclined shaft work area has a total of five working faces of the inclined shaft and left and right lines of the main tunnel.In view of the tight construction period,multi-face construction,and complex environment in the tunnel,the selection of tunnel ventilation methods and ventilation effects are related to the tunnel construction progress,the health of workers,and the cost of project.Therefore,it is particularly important to select a reasonable ventilation method.By combining theoretical analysis and numerical simulation,a three-dimensional numerical model was established,and the relevant parameters of construction ventilation and the selection of a construction ventilation scheme for the multi-working face of the tunnel were studied.Through theoretical calculation,the law of wind speed and gas migration and diffusion under different schemes is analyzed,and the fan type and configuration number that meet the requirements are selected to solve the layout problem of the air duct in the construction process of multiple working faces.
tunnelsinclined shaftventilationnumerical simulationwind speedair flow field
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