隧道施工通风中的有害气体浓度变化分析

Analysis of Harmful Gas Concentration Variation in Tunneling Ventilation

针对地下工程洞室施工中的隧洞通风,通过对理想状态下气体运动状态及通风过程的分析研究,得出施工通风过程中有害气体扩散的浓度变化公式,揭示有害气体的扩散变化规律,用工程实例对理论分析进行了验证.同时对有害气体浓度变化曲线进行仿真分析,得出在不同通风量下隧洞的通风效果,结果表明恒通风量通风模式在节能方面存在不足.

Aimed at tunneling ventilation in the underground engineering, the variation formulae of harmful gas concentration are deduced based on the analysis of gas motion and ventilation process under ideal condition. They reveal the diffusion mechanism of harmful gas in tunnel construction. An actual example of constant ventilation rate is applied to validate the formulae and the variation curves of harmful gas concentration are simulated. The result shows that the mode of constant ventilation rate has the shortage of energy waste; and the varying ventilation rate is feasible in tunneling ventilation.