类矩形盾构隧道火灾通风控烟关键参数研究

Research on Key Parameters of Ventilation and Smoke Control in Rectangle Shield Tunnel

类矩形隧道由于减少了使用空间,只能采取无防火门式的横向联络通道,若不采取有效的通风控烟方案,易导致着火隧道烟气通过联络通道侵入非事故隧道。采用FDS数值模拟,建立了全尺寸区间隧道模型,分析不同火源位置、联络通道设置方式下对隧道纵向通风控烟的影响。结果表明:联络通道的孔洞设置方式直接影响了纵向通风从事故隧道往非事故隧道分流的大小,从而影响控烟效果。在确保人员安全疏散的前提下,事故隧道断面风速至少需要2.40 m/s。

As the use space of the rectangular tunnel is reduced,only the transverse contact channel without fire door can be adopted.If the smoke control scheme is not adopted effectively,the smoke from the fire tunnel will easily enter the non-accident tunnel through the contact channel.Using FDS numerical simulation,a full-size interval tunnel model was established to analyze the influence of different fire source locations and connection channel settings on the risk control smoke of longitudinal tunnel passage.The results show that the hole arrangement of the contact channel directly affects the flow of longitudinal ventilation from the accident tunnel to the non-accident tunnel,thus affecting the smoke control effect.On the premise of ensuring the safe evacuation of personnel,the wind speed of the accident tunnel section should be at least 2.40 m/s.