复合型铁路瓦斯隧道通风流场及瓦斯运移规律研究

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中图分类号：U455 文献标志码：A 文章编号：1003-5168（2025）07-0064-05

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.07.013

Study on theVentilation Flow Field and Gas TransportationLawof CompositeRailroadGas Tunnel

LIN Qihuang

（China Railway 24 Bureau Group Fujian Railway Construction Limited，Fuzhou 3501O8， China）

Abstract：[Purposes] This paper aims to investigate the ventilation and gas transportation law during the construction of coalbed methane and shallow natural gas composite high-gas railroad tunnel.[Methods] Taking the actual project as an example，FLUENT numerical simulation software was used to conduct transient analysis and study the effect of ventilation on gas concentration.[Findings] The study shows that： ① after 2O minof ventilation，the flow field in the tunnel is basicall stable，and the wind speeds in the tunnel are all greater than 0 . 2 5 m / s ，which is in line with the requirements of the construction ventilation; ② under the stable state of ventilation，the closer the area of the palm face is，the greater the fluctuations in wind speed and gas concentrationare are; ③ after the ventilationflow field isstabilized， it isdifficult to discharge the gas accumulation atthe top of the wall，the footing，and thecornersof the walof the palm face.[Conclusions] Through analysis，it can be seen that the ventilation wind speed is 1 4 . 5 4 m / s which meets the ventilation requirements of the tunnel. Gas detection and local ventilation should be done in the area prone to gas accumulation on the return air side.

Keywords： gas tunnel; numerical simulation;gas ventilation;transportation law

0 引言

随着我国交通建设的发展，隧道及地下工程的建设规模越来越大。（剩余4215字）