不同通风方式对高温隧道掌子面温降效果研究

高温现象是长大隧道开挖过程中常见的一种自然灾害,常用的解决手段是通风降温。以某高温隧道为例,结合Fluent数值分析,从理论层面探究了侧壁压入式通风、混合式通风和拱顶压入式通风3种常用通风方式解决这类灾害的优劣,并从微观层面分析了隧道内射流气流的运动规律,探讨了较为适宜的温控方式。研究结果表明：高温隧道采用侧壁压入式通风温控方式的降温效果不佳;采用混合式通风温控方式的降温效果最差,且影响风机使用寿命,存在安全隐患;采用拱顶压入式通风温控方式在应对高温隧道时表现出高效的降温效果。

The Effect of Different Ventilation Modes on High Temperature Drop of Tunnel Face

High temperature phenomenon is a kind of common natural disasters in the process of tunnel excavation, and the common solution is ventilation cooling. With a high temperature tunnel as an example and combining with the Fluent numerical analysis, explores from the theoretical level 3 kinds of common ventilation methods such as the side wall forced ventilation, the hybrid ventilation and the vault ventilation to solve this kind of disaster, and from the micro level analyzes the motion law of tunnel jet flow and discusses the suitable temperature control mode. The research results show that the side wall pressure ventilation temperature control for high temperature tunnel has poor cooling effect; the cooling effect of hybrid ventilation temperature control is the worst, moreover it affects the service life of fans and exists security risks; the vault pressed ventilation temperature control mode for high temperature tunnel shows the efficient cooling effect.