公路隧道超长距离纵向排烟试验研究

Study on super-long-distance longitudinal smoke exhaust test of highway tunnel

为研究5 km以上公路隧道超长距离全射流纵向排烟可行性与有效性,依托全长6015 m的羊鹿山隧道,在不利于排烟的左线隧道(单向下坡)内开展20 MW现场火灾全射流纵向排烟试验。试验期间自然风速为1.0~1.6 m/s,与通风排烟方向相反,表现为排烟阻力。研究表明:左洞内开启6组射流风机时,洞内沿程风速约为3.5 m/s,开启12~15组风机时,下坡隧道内沿程风速约为5.5~7.0 m/s;20 MW油盘火试验从点火开始到烟气全部排出洞外的时间约为30 min。根据现场火灾排烟试验,对于羊鹿山隧道,在保证人员安全的情况下,采用全射流纵向排烟是可行的。

In order to study the feasibility and effectiveness of full jet longitudinal smoke exhaust in highway tunnel with the superlong length of more than 5 km,full jet longitudinal smoke exhaust field fire test of 20 MW is carried out in the left tunnel of Yan⁃glushan tunnel with a total length of 6015 m,which is a downhill tunnel that is not conducive to smoke exhaustion.Natural wind ve⁃locity in the left tunnel of the Yanglushan tunnel is 1.0~1.6 m/s during the field fire test,and the wind direction is opposite to the direction of smoke exhaust,which is resistance for smoke exhaust.The research shows:The wind velocity is 3.5 m/s along the down⁃hill tunnel when 6 groups of jet fans are started up,which is 5.5~7.0 m/s with 12~15 groups;From the start of ignition,the smoke exhaust time of the 20 MW oil pan fire is about 30 min.According to the test results,with the safety of personnel,it is feasible to use the full jet longitudinal exhaust in the Yanglushan tunnel.