风阀对地铁隧道压力的影响研究

Effect of Air Valve on Pressure Change in Metro Tunnel

随着地铁列车速度的提高,列车运行引起的空气动力学效应对站台屏蔽门、各类风井内风道等的安全影响越来越大。针对广州地铁多条线路,采用现场试验方法,对地铁风道不同位置的壁面压力进行了现场测试,得到了地铁车站站端及区间中间风井不同风阀前后测点的动态压力变化,并通过对比分析,研究了风阀对地铁风道内压力幅值的影响。现场测试结果表明:当列车速度为80km/h时,每道风阀的阻力作用会将风道内最大正压降低10~40Pa,最大负压降低10~60Pa;联通风阀开启会将轨行区和活塞风道内的最大正压降低10~30Pa,最大负压降低30~40Pa。

With the increasing speed of subway train,the aerodynamic effects caused by train operation have a greater and greater effect on the safety of platform screen doors and the air passage of the airshafts.For multiple lines of Guangzhou Metro,the dynamic pressure at different locations of the airshaft and tunnel is tested by field measurement.The pressure changes before and after the different valves at the airshaft of the station and the middle airshaft during two stations are obtained.The effect of air valve on pressure amplitude at the air passage of the airshafts was studied through comparative analysis.The field test results show that when the train speed is 80km/h,because of the resistance of every air valve,the maximum positive pressure and negative pressure at the air passage will be respectively reduced 10~40Pa and 10~60Pa.Moreover,the opening of the joint ventilation valve will reduce the maximum positive pressure of 10~30Pa and the maximum negative pressure of 30~40Pa for tunnel and the air passage of the airshafts.