摘要
对压入式机械通风夏季施工隧道内空气流动方向和速度进行了调查。结果显示:隧道内空气流动呈非单一方向,隧道顶部风速最大,离地面2m~3m处风速最小,并且在距洞口300m处存在气流交叉现象,其原因可能是隧道内热负压自然通风和洞外气温较高两者共同作用所产生。
he paper reports the study on the direction and velocity of air current inside construction tunnel under condition of ventilation with fan.The result shows that the direction of air current is not one way.The direction in the upper part of tunnelling is opposite to that in the lower of tunnelling.The velocity in the top of tunnelling is the fastest.Besides there is a intersection of air current at 300 meters apart from entrance of tunnelling.It is considered that reason of intersection of air current is two conditions jointly.The one is that nature ventilation due to the heat pressure is caused by high air temperature in excavatimg face.The other is that the heated air current outward is resistted which is caused by air temperature outside tunnelling being higher than in middle section of tunnelling
出处
《铁道劳动安全卫生与环保》
1997年第4期263-265,共3页
Railway Occupational Safety Health & Environmental Protection
关键词
压入式通风
施工隧道
空气流向
空气流速
Forced ventilation,\ Tunnel under construction,\ Direction of air current,Velocity of air current