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为了给城市地下交通联系隧道(UTLT)防排烟系统设计和人员应急救援提供参考依据,以重庆某UTLT二期工程一段主隧道为例,开展全尺寸火灾试验,探讨了横向排烟方案的烟控效果,并验证了Alpert顶棚最高温升衰减模型。结果表明,UTLT主隧道段采用横向排烟方案,当防烟分区长度为120 m时,采用的排烟量设计方法是合理的。当隧道为上坡时,最有利的烟气控制模式为同时开启着火分区及下游相邻分区的排烟系统和与排烟分区紧邻的上、下游两个分区的补风系统。隧道顶部烟气最高温升衰减规律为:下游距火源无量纲距离r/H<0.57及上游部分,呈指数衰减;下游距火源无量纲距离r/H>0.57部分,呈幂函数衰减,且衰减程度与排烟方案有关。
In order to provide a reference for the design of UTLT smoke exhaust system and personnel emergency rescue, taking a section of the main tunnel of a UTLT II project in Chongqing as an example, a full scale fire test was carried out to investigate the effect of horizontal smoke exhaust scheme Control effect, and verify the Alpert roof ceiling temperature rise and decline model. The results show that the lateral exhaust smoke scheme is adopted in the main section of UTLT. When the length of smoke control zone is 120 m, the design method of exhaust smoke is reasonable. When the tunnel is uphill, the most favorable mode of flue gas control is to open both the exhaust system of the fire zone and the adjacent downstream zone and the system of air supply of the two zones upstream and downstream adjacent to the exhaust zone. The attenuation law of maximum temperature rise of flue gas at the top of the tunnel is as follows: the dimensionless distance r / H <0.57 downstream from the ignition source and the exponential decay in the upstream part and the dimensionless distance r / H> 0.57 downstream from the ignition source show a power function decay, And the degree of attenuation and smoke program.