During the construction of railway tunnels in plateau environment regions, ensuring adequate oxygen supply is crucial for both worker health and safety, and tunnelling progress. Existing diffusion-type oxygen supply enrichments for plateau regions lack quantitative conclusions and have not been implemented systematically in actual engineering. To refine the design parameters of the required method, this study utilized computational fluid dynamics (CFD) to examine the optimal design parameters for oxygen supply equipment in a typical engineering project. The optimal scheme consisted of three rows of oxygen diffusion apparatuses with 0.07 m inlet diameter, 0.4 m lateral spacing and 60° tilt that maintain a constant oxygen supply rate. This configuration maximized oxygen concentration enrichment in workers’ breathing zones, with oxygen partial pressure in most target zones remaining below 3000 m altitude, except for the ventilation side where it was 3360 m. This study elucidated the effects of various design parameters on oxygen distribution and proposed the optimal combination for a typical tunnel engineering project. The findings provide a guidance for implementing diffusion-type oxygen enrichment in high-altitude tunnel construction, aiding both worker safety and project efficiency.

中文翻译：

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高原铁路隧道工作面附近扩散式供氧优化

在高原环境地区铁路隧道施工过程中，保证充足的氧气供应对于工人的健康安全和隧道施工进度至关重要。现有高原地区扩散式供氧富集缺乏定量结论，在实际工程中尚未系统实施。为了细化所需方法的设计参数，本研究利用计算流体动力学 (CFD) 来检查典型工程项目中供氧设备的最佳设计参数。最优方案为三排氧扩散装置，入口直径0.07 m，横向间距0.4 m，倾斜60°，保持恒定的供氧速率。这种配置最大限度地富集了工人呼吸区域的氧气浓度，大多数目标区域的氧分压保持在 3000 m 海拔以下，但通风侧的氧分压为 3360 m。本研究阐明了各种设计参数对氧气分布的影响，并为典型隧道工程项目提出了最佳组合。研究结果为在高海拔隧道施工中实施扩散式富氧提供了指导，有助于工人安全和项目效率。