摘要
通过现场测试高速铁路列车引起的隧道气动效应,分析列车速度、列车编组、隧道长度等因素对气动荷载、振动加速度和微气压波的影响。结果表明:列车通过隧道时,隧道壁面及附属设施表面气动荷载峰值与列车速度近似呈2次方关系;8编组列车通过较短隧道时气动荷载峰值大于通过较长隧道时,16编组列车则相反;控制箱左右两侧气动荷载峰值相差较小,顶底部气动荷载峰值相差明显;在隧道防护门中部气动荷载峰值大于上部和下部,上部和下部气动荷载峰值接近;隧道壁面无显著振动,隧道附属设施表面振动明显;在距隧道入口200 m处压力梯度峰值与列车速度呈3次方关系,列车运行速度超过一定值后,出口附近压力梯度峰值高于入口附近;隧道出口20 m处微气压波峰值与列车速度近似呈6次方关系。
Through field test of tunnel aerodynamic effects caused by high speed railway trains,the influence of factors such as train speed,train formation,and tunnel length on aerodynamic loads,vibration accelerations,and micropressure waves was analyzed.The results indicate that when a train passes through a tunnel,the peak aerodynamic load on the tunnel wall and ancillary facilities is approximately quadratic with the train speed.When 8 formation trains pass through shorter tunnels,the peak aerodynamic load is greater than that when passing through longer tunnels,while for 16 formation trains,the situation is opposite.The difference in peak aerodynamic loads between the left and right sides of the control box is relatively small,while the difference in peak aerodynamic loads between the top and bottom is significant.The peak aerodynamic load in the middle of the tunnel protective door is greater than that in the upper and lower parts,and the peak aerodynamic load in the upper and lower parts is close.There is no significant vibration on the tunnel wall,and the surface vibration of the tunnel ancillary facilities is significant.The peak pressure gradient at a distance of 200 m from the tunnel entrance is in cubic relationship to the train speed.After the train speed exceeds a certain value,the peak pressure gradient near the exit is higher than that near the entrance.The peak value of the micropressure wave at a distance of 20 m from the tunnel exit is approximately a sixth power relationship with the train speed.
作者
方雨菲
FANG Yufei(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2023年第4期65-68,共4页
Railway Engineering
基金
中国铁道科学研究院集团有限公司基金(2021YJ177)。
关键词
铁路隧道
气动效应
现场试验
气动荷载
振动加速度
压力梯度
微气压波
railway tunnel
aerodynamic effect
field test
aerodynamic load
vibration acceleration
pressure gradient
micro-pressure wave
