重点排烟模式盾构隧道横断面火灾特性研究

Study on Fire Characteristics in Shield Tunnel with the Point Smoke Extraction System

以在建的上海市虹梅南路越江隧道为对象,借助SMARTFIRE软件模拟了50MW规模的火灾下,开启火源上下游各一个排烟口时,主要分析了三个位置横断面中心线上温度、能见度和一氧化碳浓度沿竖向的变化规律。研究结果表明,排烟口面积保持不变时,排烟口横向布置的排烟效率大于排烟口纵向布置,并且长宽比越大,排烟效果越好。

With the the South Hongmei Road Tunnel project under construction as backgroud, three different dimensions of extraction openings were simulated for a 50 MW fire scenario by using SMARTFIRE. Two ex- traction openings in the upstream and downstream were opened for each case. The variation of temperature, visibility and carbon monoxide concentration along the vertical direction on three cross-sections were analyzed to investigate fire characteristics on the cross-section and the smoke exhaust efficiency. The simulation results show that changing the direction of extraction opening from longitudinal to horizontal can increase the smoke exhaust efficiency. Furthermore, the larger aspect ratio of extraction opening will improve the smoke exhaust efficiency.