In order to determine the reasonable air velocity monitoring point layout position of average air velocity monitoring in the circular subway interval tunnel,the numerical simulation method is used to analyze the size of velocity and distribution of air velocity in the cross section in the tunnel.The result show piston wind speed in the interval tunnel is 2m/s～ 10m/s.It is feasible to install the air velocity monitoring point in the area close to the wall and does not affect the safety train,and obtain the average air velocity in the tunnel by modifying the air velocity of the monitoring point.At the same time,the relationship v=K(v) between the air velocity at the monitoring point and the tunnel diameter and the average air velocity is summarized.The air velocity of monitoring point is linearly related to the average air velocity in the tunnel 1,and the monitoring point is closer t to the center of the tunnel,the linear correlation is higher.%为了确定地铁区间隧道内的平均风速,合理布置风速监测点是准确监测断面平均风速的关键.针对圆形地铁区间隧道,对隧道内活塞风速大小和断面上风速分布进行了数值研究,研究结果表明区间隧道内的活塞风速大小为2m/s～10m/s;通过将监测点布置在平均风速点处直接测得隧道平均风速的方法是不可行的,而通过修正监测点风速得到隧道内的平均风速的监测方法是可行的,并给出了隧道断面上不同监测点处风速与断面平均风速的计算公式v=Kv;隧道内监测点风速与隧道平均风速呈线性关系,且监测点离隧道中心越近,线性关系的相关性越高.
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