高速铁路隧道衬砌裂缝气动荷载激化效应  

Intensification Effect of Aerodynamic Load in Lining Cracks of Highspeed Railway Tunnel

作　　者：杨伟超[1] 何洪 赵伦 刘义康 邓锷 YANG Weichao;HE Hong;ZHAO Lun;LIU Yikang;DENG E(Central South University,Changsha,Hunan 410075,China;The Hong Kong Polytechnic University,Kowloon 999077,China)

机构地区：[1]中南大学,长沙410075 [2]香港理工大学,中国香港九龙999077

出　　处：《铁道工程学报》2024年第11期74-82,共9页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51978670);中国中铁股份有限公司科技研究开发计划项目(重大专项课题,2021-专项-04-2);中国中铁股份有限公司科技研究开发计划(2021-重大-01,2022-重点-23)。

摘　　要：研究目的:高速铁路隧道掉块频发可能引发严重的经济损失甚至人员伤亡。高速列车气动荷载在裂缝内的激化效应可能是导致裂缝拓展并最终形成掉块的重要原因。为防止高速铁路隧道掉块事故发生,加强隧道病害治理,应对衬砌裂缝气动荷载的激化效应展开针对性研究。本文基于Fluent软件采用有限体积法(FVM)和Pressure-Based求解器,考虑空气可压缩性,采用非稳态粘性k-ε湍流模型对裂缝空间内的气动压力进行模拟,利用该模型讨论环向、斜向、纵向裂缝气动荷载的时空特征,分析气动压力的频谱特征,并对比裂纹长度、宽度、深度及车速对裂缝面气动荷载的影响。研究结论:(1)压力波进入环向裂缝腔内具有瞬时性,而进入斜向与纵向裂缝腔内具有过程性;(2)环向裂缝压力峰值最大,为输入压力的5.32倍;斜向、纵向裂缝压力峰值分别仅为环向裂缝相应值的79.5%与64.9%;(3)环向裂缝气动压力PSD平均值是纵向裂缝和斜向裂缝相应值的4.04倍和1.54倍;(4)裂纹长度、宽度对裂缝面压力峰值的影响有限,裂纹深度与压力峰值满足线性函数关系,车速与压力峰值满足幂指数为2.3033的幂函数关系;(5)本研究成果可为高铁隧道的设计、隧道内裂缝的评估和修复提供参考。Research purposes:Frequent falling blocks in high-speed rail tunnels can cause serious economic losses and even casualties.The intensification effect of high-speed train aerodynamic load in the crack may be an important reason for the crack expansion and eventually the formation of falling block.In order to prevent falling block accidents in high-speed railway tunnels and strengthen tunnel disease control,the intensification effect of aerodynamic load in lining cracks should be studied.In this study,based on Fluent software,finite volume method(FVM)and Pressure-Based solver are used to simulate the aerodynamic pressure in crack space by unsteady viscous k-ε turbulence model considering the compressibility of air.Using this model,the temporal and spatial characteristics of the aerodynamic loads of circumferential,inclined and longitudinal cracks are discussed.The spectrum characteristics of aerodynamic pressures are analyzed,and the effects of crack length,width,depth and vehicle speed on the aerodynamic loads of crack surface are analyzed.Research conclusions:(1)The pressure wave enters the circumferential crack space instantaneously,and the pressure wave enters the inclined and longitudinal crack space procedurally.(2)The peak value of circumferential crack pressure is 5.32 times of the input pressure.The peak pressure values of inclined and longitudinal crack are only 79.5%and 64.9% of the corresponding values of circumferential crack,respectively.(3)The PSD of the aerodynamic pressure of the circumferential crack is 4.04 and 1.54 times higher than the value of longitudinal and inclined cracks on average.(4)The crack length and width have limited influence on the peak pressure of crack surface.The crack depth and the peak pressure meet the linear function relation,and the speed and the peak pressure meet the power function relation of 2.3033.(5)The research findings can provide references for the design of high-speed rail tunnels,and the assessment and repair of cracks within the tunnels.

关 键 词：高速铁路隧道 衬砌裂缝 气动荷载 激化效应 数值模拟 

分 类 号：U25[交通运输工程—道路与铁道工程]