隧道附属设施气动效应分析

Analysis on Aerodynamic Effect of Tunnel Auxiliary Facilities

为研究列车经过时气动效应对隧道内附属设施的影响,通过现场测试分析不同因素对隧道附属设施表面气动荷载、振动加速度和列车风速的影响,给出隧道内气动荷载分布规律。研究结果表明:附属设施受到的气动荷载与列车运行速度平方近似成正比关系;隧道长度和编组对附属设施气动荷载存在耦合影响,存在最不利隧道长度,车型和季节对附属设施气动荷载影响不显著;附属设施振动加速度主要由气动荷载引起;列车运行速度由300 km/h增加到350 km/h时,隧道附属设施表面气动荷载和振动加速度均增大约40%,列车风速增大约10%。

In order to study the influence of aerodynamic effects on tunnel auxiliary facilities when trains pass by,the effect of different factors on the aerodynamic load of the ancillary facilities surface,vibration acceleration and train winds velocity in tunnels was studied and aerodynamic load distribution laws in tunnels were given through field test.The research results show that the aerodynamic load on the auxiliary facilities is approximately proportional to the square of the train speed.The tunnel length and train marshalling have a coupling effect on the aerodynamic load of the auxiliary facilities.There is the most unfavorable tunnel length.The effect of the train type and season on the aerodynamic load of auxiliary facilities surface is not significant.The vibration acceleration of auxiliary facilities is mainly caused by the aerodynamic load.When the train speed increases from 300 km/h to 350 km/h,the aerodynamic load and vibration acceleration on the surface of tunnel ancillary facilities both increase about 40%and the train wind velocity increase about 10%.