高铁隧道间断型缓冲结构的气动效应分析  

Analysis of Aerodynamic Effects of Intermittent Buffer Structures in High-speed Railway Tunnels

作　　者：高利民 闫亚光[1] 杨彬彬 邵健恒 任远 GAO Limin;YAN Yaguang;YANG Binbin;SHAO Jianheng;REN Yuan(School of Civil Engineering,Hebei University of Engineering,Handan 056000,China)

机构地区：[1]河北工程大学土木工程学院,邯郸056000

出　　处：《粉煤灰综合利用》2024年第5期97-102,共6页Fly Ash Comprehensive Utilization

摘　　要：随着高速铁路的快速发展,列车突入隧道所引发的气动效应问题愈发严重,在既有线路的提速改造中,为降低隧道出口微气压波的危害,提出一种新型隧道缓冲结构——间断型缓冲结构。基于三维、可压缩、非定常N-S方程,利用滑移网格技术及数值模拟的方法,对高速列车进入隧道全过程的气动效应进行模拟,分析初始压缩波的特性,从节数、节长、节间距、断面面积的4个方面进行研究,对比不同工况下的减缓效果,优化其设计参数。结果表明:间断型缓冲结构可以有效地降低初始压缩波压力梯度的最大峰值,减缓压力曲线上升的速度,但对压力最大值无明显影响;当间断型缓冲结构节数为3节、断面面积为150 m^(2)、节长为11 m、节间距为0.5 m时,降低效果最好,达到54.38%。With the rapid development of high-speed railway,the problem of aerodynamic effect caused by train breaking into the tunnel is becoming more and more serious,in order to reduce the harm of micro-pressure wave at the exit of the tunnel in the speed improvement of the existing line,a new tunnel buffer structure,intermittent buffer structure,is proposed.Based on the three-dimensional,compressible and unsteady N-S equations,the aerodynamic effect of the whole process of high-speed train entering the tunnel was simulated by using slip grid technology and numerical simulation,and the characteristics of the initial compression wave were analyzed.The results show that the discontinuous buffer structure can effectively reduce the maximum peak value of the initial compression wave pressure gradient and slow down the rising speed of the pressure curve,but has no obvious effect on the maximum pressure.When the number of intermittent buffer structures is 3 sections,the cross-sectional area is 150 m^(2),the length of a single section is 11 m,and the discontinuity distance is 0.5 m,the reduction effect is the best,reaching 54.38%.

关 键 词：高铁隧道 缓冲结构 压缩波 压力梯度 

分 类 号：U451[建筑科学—桥梁与隧道工程]