摘要
通过调查统计重庆地铁6号线区间隧道的断面形式,引入隧道断面形状系数ζ,建立断面形状系数ζ<1的模型实验台。采用模型实验与FDS模拟相结合的方法,探讨地铁隧道采用纵向排烟系统时,不同热释放速率及排烟速度的条件下区间隧道内烟气温度纵向分布特征。研究结果表明:Kurioka模型适用于断面形状系数ζ≥1的地铁区间隧道,对于断面形状系数ζ<1的地铁区间隧道,需要对Kurioka模型进行修正。对于断面形状系数ζ≥1的地铁区间隧道,顶棚上游烟气温度纵向分布服从指数衰减规律。然而,对于断面形状系数ζ<1的地铁区间隧道,顶棚上游烟气温度虽然也服从指数衰减规律,但需要进行模型修正。修正值Kζ与断面形状系数ζ之间满足线性关系,顶棚上游烟气温度沿纵向衰减速度,随隧道断面形状系数的增大而增大。
Based on the investigation of the metro tunnel section of Line 6 in Chongqing, China, sectional coefficient ζ was introduced to describe geometrical characteristic of tunnel section. The smoke temperature distribution on the top of the tunnels with induced longitudinal flow under different HRR and longitudinal ventilation velocity was researched by small scale model experiments and FDS simulations methods. The results show that Kurioka model can be used in the tunnel with ζ≥1, and it should be modified for the tunnel with ζ〈 1. And the smoke temperature rise along longitudinal direction corresponds exponential decay law in the tunnel with ζ≥1, and it should be also modified for the tunnel with ζ 〈 1. The relationship between modification value Kζ and the sectional coefficient ζ is linear, and the decay speed increases with the increase of ζ.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第2期661-669,共9页
Journal of Central South University:Science and Technology
基金
高等学校学科创新引智计划项目(B13041)
重庆市研究生科研创新项目(CYB14031)~~
关键词
安全工程
区间隧道火灾
烟气温度
相似模型实验
计算机模拟
safety engineering
metro tunnel fire
smoke temperature
scale model experiment
numerical simulation
