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火灾条件下影响安全疏散的因素包括隧道中烟气流动性及其温度随时空的分布。针对一端封闭的隧道火灾情形,采用临界温度与临界视距判据,对一端封闭的长300 m掘进中的隧道进行了数值模拟,获得了温度与烟气浓度分布随时空的变化规律,发现其温升速率沿隧道纵向按指数规律衰减,而且临界温度与临界视距交错出现。
Factors affecting safe evacuation under fire conditions include the flue gas mobility in tunnels and the distribution of temperature over time and space. Aiming at the tunnel fire with one end closed, the tunnel with a closed 300 m long tunnel at one end was numerically simulated by using the critical temperature and critical line-of-sight criterion. The distribution of temperature and flue gas concentration was found to change with time and space. The rate of temperature rise attenuates exponentially along the longitudinal direction of the tunnel, and the critical temperature is staggered with the critical line of sight.