地下环形隧道集中排烟模式的试验研究

Experimental study on concentrated extraction of annular tunnel

通过实体火灾试验对地下环形隧道内烟气控制模式开展试验研究,对其排烟性能进行验证。试验采用柴油油盘火模拟汽车火灾,试验段划分为4个防烟分区,排烟方式为"中间排、两侧补",采集火源上、下游烟气温度及蔓延范围和高度。烟气总蔓延长度为210m,烟气层高度维持在2.8m,人员通行高度内基本不受烟气影响;人员可以迎风疏散,疏散安全水平较高。试验结果验证了排烟方案可以将火灾烟气控制在中间两个防烟分区内,满足判定指标要求。

ExperiMental study in an annular tunnel on the performance of smoke management systems under fire was carried out. Diesel oil pan was used to simulate automobile fire in this test. The test tunnel was divided into 4 smoke zones. The smoke was exhausted from the center and the air supplied from both sides. The temperature and spread and height of smoke upstream and downstream to the fire were tested. The smoke spread 210 m, stayed higher than 2.8 m, so it could not affect the range of person evacuation. People could evacuate face the wind safely. The test results verified that fire smoke could be control in two smoke zones at the middle; the ventilation scheme could fit the requirement of decision index.