火源与排烟竖井的相对位置对重点排烟效果的影响研究

借助理论分析及数值模拟相结合的手段对某盾构城市地下道路火灾工况下,火源与排烟竖井的相对位置对重点排烟效果的影响进行模拟研究。研究结果表明单向排烟模式在一定的排烟量条件下,火源位置距离排烟竖井越近,排烟效果越好。当火源位于两个排烟竖井之间且偏向其中某一个竖井位置时,在排烟量允许的前提下,可以仅开启离火源位置较近的竖井风机排烟;当火源位于两竖井正中间位置时,可采用双向排烟模式;当火源恰好位于某个竖井正下方时,可以仅开启该竖井风机排烟,但采取该工况应综合考虑隧道内烟道板的耐火极限及耐火时间。

Study on the influence of the relative position of fire source and smoke exhaust shaft on point smoke exhaust effect

Theoretical analysis and numerical simulation are used to study the impact of the relative position of the fire source and the smoke extraction shaft on the point smoke extraction effect under a city underground road fire condition. The research results show that under a certain amount of smoke exhaust, the closer the exhaust fan to the fire source is, the better the exhaust effect is in the one-way smoke exhaust mode. When the location of the fire source is biased to one of the shafts, if the amount of smoke exhaust is enough, only the shaft fan close to the fire can be turned on to exhaust smoke. When the fire source is in the middle of the two shafts, the two-way smoke exhaust mode can be used. When the fire is located below the shaft, the shaft above the fire can be used to exhaust smoke. When adopting this working condition, the fire resistance rating of the flue plate in the tunnel should be considered comprehensively.