地铁隧道带与不带竖井列车活塞效应模拟研究

Simulation Research on Train-induced Piston Effect in Subway Tunnels with and without Shaft

为研究地铁隧道内带竖井与不带竖井对列车活塞效应的影响及区别,采用移动网格和滑移交界面技术对模型隧道进行三维非稳态数值计算。结果表明,采用移动网格技术对不带竖井隧道模拟计算结果与国外试验吻合;带竖井模型中,隧道入口风速在列车通过竖井时达到峰值,出口风速出现峰值时刻与不带竖井一致,且峰值均略有增大;竖井有利于减小隧道入口压力梯度和压力峰值,列车通过竖井时,造成出口出现较大压力梯度和压力峰值;列车减速尾部压力由负压变成正压。

To analyze the effect and the difference of the train - induced piston phenomena in subway tunnel with shaft and without shaft,a three - dimensional unsteady numerical analysis using the moving mesh and the sliding interface methods was carried out for the tunnel.The results show that the numerical result using moving mesh method for the tunnel without shaft agrees well with the foreign experimental data.In the tunnel with shaft,the peak of the velocity of the tunnel inlet takes places at the time when the train is passing by the shaft,The peak time of the velocity at the tunnel outlet is the same as that for the tunnel without shaft.And the peak value is a little bigger.The shaft is beneficial to reducing the pressure gradient and the pressure amplitude at the tunnel inlet.But the pressure gradient and the pressure amplitude at the tunnel outlet is much greater when the train is passing by the shaft.The pressure in rear of the train would change from negative to positive.