摘要
为简化特长公路隧道上跨主洞的排烟道结构,文章以黄角坪隧道为依托工程,建立了三种特长公路隧道排烟方案及排烟道结构火灾三维数值计算模型,分析了不同排烟方案及排烟道结构对排烟效果的影响。结果表明:竖井上跨式排烟道结构方案的排烟效率相对较高,为87.1%,干字型排烟道结构方案次之,侧壁上跨式排烟道结构方案的排烟效率最低,仅有75.9%;侧壁上跨式排烟道结构方案排烟道内最高温度相对较高,为153.4℃,干字型排烟道结构方案次之,竖井上跨式排烟道结构方案最低,仅为119.5℃;而对于火源正上方区域的最高温度而言,侧壁上跨式排烟道结构方案同样相对较高,达331℃,竖井上跨式排烟道结构方案次之,干字型排烟道结构方案最低,仅为274℃;干字型排烟道结构方案的排烟道内风速相对较高,而竖井上跨式及侧壁上跨式排烟道结构方案的排烟道内最高风速相同。
In order to simplify the smoke exhaust duct structure crossing over the main tube in an ultra-long highway tunnel,Huangjiaoping Tunnel Works was based on in this paper to establish three 3 D numerical calculation models for smoke exhaust schemes and smoke exhaust duct structures of the ultra-long highway tunnel to analyze the influence of different smoke exhaust schemes and smoke exhaust duct structures on smoke exhaust effect.The results indicate that the smoke exhaust efficiency is relatively high,namely 87.1%,in the shaft-overcrossing smoke exhaust duct scheme,followed by the inverted T-shaped smoke exhaust duct scheme and the sidewall-overcrossing smoke exhaust duct scheme successively,and the smoke exhaust efficiency of the last one is the lowest,namely only75.9%;maximum temperature is relatively high,namely 153.4℃,in the sidewall-overcrossing smoke exhaust duct scheme,followed by the inverted T-shaped smoke exhaust duct scheme and the shaft-overcrossing smoke exhaust duct scheme successively,and maximum temperature of the last one is the lowest,namely only 119.5℃;maximum temperature in the area directly above the fire source is also relatively high,up to 331℃,in the sidewallovercrossing smoke exhaust duct scheme,followed by the shaft-overcrossing smoke exhaust duct scheme and the inverted T-shaped smoke exhaust duct scheme,and maximum temperature of the last one is the lowest,namely only274℃;the wind speed is relatively high in the inverted T-shaped smoke exhaust duct scheme,while the maximum wind speed is identical in the shaft-overcrossing smoke exhaust duct scheme and the sidewall-overcrossing smoke exhaust duct scheme.
作者
许白杨
袁松
张生
梁世成
王峰
XU Baiyang;YUAN Song;ZHANG Sheng;LIANG Shicheng;WANG Feng(Sichuan Communications Construetion Group Co.,Ltd.,Chengdu 610000;Sichuan Communication Surveying&Design Institute Co.,Ltd.,Chengdu 610017;Key Laboratory of Transportation Tumnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031)
出处
《现代隧道技术》
CSCD
北大核心
2021年第S01期513-519,共7页
Modern Tunnelling Technology
基金
国家自然科学基金(52078429)
四川省科技计划(2020YFS0290)
关键词
特长公路隧道
排烟道结构
数值计算
排烟效果
最高温度
风速
Extra-long highway tunnel
Smoke exhaust duct structure
Numerical calculation
Smoke exhaust effect
Maximum temperature
Wind speed
