摘要
采用1:15搭建比例模型,考虑不同竖井参数的工况(竖井长度、竖井高度、竖井群位置)情况下顶部开口型自然通风隧道的运营通风效果。试验模拟车间距2 m的车队连续通过3车道隧道时的情景。通过测量以一定速度行驶的车队连续不断地通过隧道过程中于不同位置处断面的风速,计算得出隧道各通风口的局部阻力系数。以局部阻力系数作为与竖井的形式和竖井内的通风比例相关的隧道通风效果的判断参数,得出基于竖井参数的最优工况。试验结果表明,增加竖井高度、减小竖井长度会减小风口的局部阻力系数,而改变竖井的位置则会导致局部阻力系数的重新分布。通过对比不同竖井尺寸工况下竖井的进排风速,得到进排风竖井的分布情况。
A study is conducted to make comparison of operation effects of a natural ventilation tunnel with different settings of shaft size and shaft location.A 1:15 reduced scale model of Donghu Tunnel is made to test the wind velocity along the tunnel when a motorcade of 2 m passes the tunnel continually.The characteristic parameters such as wind velocity of shafts,wind velocity along the tunnel axis and the coefficient of local resistanceξ_i at the ventilation shafts has been obtained.The coefficient of local resistanceξ_i at the ventilation shaft is a critical parameter related to the shaft size and location,which is decisive for choosing shafts.Finally the result shows that tunnels with shafts of higher height and shorter length have smaller coefficient of local resistanceξ_i,while the change of location of shaft group can alter the distribution of coefficient of local resistance.
作者
李伯尧
闫治国
LI Boyao;YAN Zhiguo(State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University, Shanghai 200092;Department of Geotechnical Engineering,Tongji University,Shanghai 200092)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第A02期713-719,共7页
Modern Tunnelling Technology
基金
风景区特长湖底城市隧道通风关键技术研究
土木工程防灾国家重点实验室自主课题(SLDRCE14-B-30)
关键词
隧道自然通风
竖井尺寸
竖井位置
局部阻力系数
Natural ventilation tunnel
Shaft size
Shaft location
Coefficient of local resistance
