摘要
随着我国高速铁路建造技术高质量发展,高速列车运行速度不断提升。受列车运行速度、隧道服役时间等众多因素的影响,高速铁路隧道在服役期间,衬砌裂损掉块病害现象日益凸显,严重危害行车安全。为探究行车环境下,列车风及其流场结构对隧道衬砌掉块下落过程的影响规律,建立列车-隧道-衬砌掉块-空气三维气固耦合计算模型,模拟行车环境下衬砌掉块自隧道拱顶脱落到下降落地的全过程。研究结果表明:1)衬砌掉块的下落过程包括3个方向的平动与转动,平动以沿列车纵向运动为主,纵向运动位移约为横向运动位移的4倍,转动以横轴为主;2)列车风与衬砌掉块相互作用相互影响,列车风作用在掉块时,掉块周围的流场出现漩涡、绕流等现象继而改变掉块的运动姿态和方向。与此同时,掉块的运动又进一步使其周围流场结构发生改变,以此不断反复直至落地;3)沿列车纵向上是流场结构的主要流动方向,列车风作用在掉块上,推动其运动,故沿列车纵向为衬砌掉块的主要运动方向。衬砌掉块随时间变化与流场结构产生不同的夹角与不同强度的绕流,故衬砌掉块的转动以横轴为主。研究结果对防治隧道掉块病害及提高行车安全性具有一定的参考价值。
With the high-quality development of China’s high-speed railway construction technology,the running speed of high-speed trains is constantly improving.Under the influence of high train speed and long service time,lining cracks and falling blocks in high-speed railway tunnels are increasingly prominent during the service period,seriously endangering the driving safety of high-speed trains.In order to investigate the influence of train wind and its flow field structure on the falling process of tunnel lining falling block under driving environment,a 3D air-solid coupling model of train-falling block-air was established to simulate the whole process of falling block moves from tunnel vault to ground under driving environment.The results are drawn as follows.(1)The falling process of lining falling blocks includes translation and rotation in three directions.The translational motion is mainly along the longitudinal motion of the train,the displacement of the longitudinal motion is approximately 4 times of the lateral displacement.The rotation is mainly along the horizontal axis.(2)The train wind and the lining falling block interact with each other.When the train wind acts on the falling block,the flow field around the falling block appears vortex and flows around,and then changes the motion posture and direction of the falling block.At the same time,the movement of the falling block further changes the structure of the flow field around it,which is repeated until it falls to the ground.(3)The longitudinal direction of the train is the main flow direction of the flow field structure.The train wind acts on the falling block,pushing its movement.As a result,the main movement direction of the lining falling block is along the longitudinal direction of the train.The lining falling block has different angle and different strength flow around the flow field structure with the change of time,so the rotation of the lining falling block is dominated by the horizontal axis.The research results have certain reference value fo
作者
杨伟超
杨佳宝
刘义康
王昂
施成华
YANG Weichao;YANG Jiabao;LIU Yikang;WANG Ang;SHI Chenghua(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410075,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2023年第5期1565-1577,共13页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51978670)。
关键词
衬砌掉块
气动力学行为
行车安全
列车风
流场演化机制
lining falling block
aerodynamic behavior
driving safety
train wind
flow field evolution mechanism
