高铁隧道间断型缓冲结构的气动效应分析

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GAO Limin，YAN Yaguang，YANG Binbin，SHAO Jianheng，REN Yuan （School of Civil Engineering，Hebei University of Engineering，Handan O56OOO， China）

Abstract：Withtherapid developmentof high-speedrailway，the problem of aerodynamic effectcaused bytrain breaking into thetunelisbecoming moreandmoreserious，inordertoreducetheharmofmicro-pressurewaveattheexitofthetunnelin thespeedimprovementoftheexistingline，anewtunnelbuferstructure，intermittentbuferstructure，isproposed.Basedon thethree-dimensional，compressbleandunsteadyN-Sequations，theaerodynamicefectofthewholeprocessofhigh-speed trainenteringthetunnel wassimulatedbyusing slipgrid technologyandnumerical simulation，andthecharacteristicsof the initialcompresion wavewereanalyzed.Theresultsshowthatthe discontinuous buferstructurecanefectivelyreduce the maximum peak valueof theinitial compression wave pressure gradient andslowdown therising speedofthe pressre curve，but has no obvious efectonthemaximum pressure.When the numberof intermitent buffer structures is 3sections，the cros $＼ulcorner$ （204 sectional area is ，the length of a single section is 11m ，and the discontinuity distance is 0.5m ，the reduction effect is the best，reaching 54.38% ：

Keywords： high- speed rail tunnel； buffer structure； compression waves；； pressure gradient

0 引言

当高铁驶入隧道时，由于隧道壁面和列车车身的限制，列车前方空气不能及时排开[1]，从而使一部分空气沿着隧道壁面和列车壁面之间的路径向后运动，形成绕流“列车风”，另一部分空气在列车的推动下，以压缩波的形式向隧道出口处传播[2]，压缩波传至洞口处时，一部分沿原路径以微气压波的形式向隧道出口外传播，伴随强烈的爆炸声，影响周围环境和建筑物；另一部分转化为膨胀波向隧道入口方向反射[3]，不断发生压缩波、膨胀波的转化叠加，使隧道内气动效应更加复杂。（剩余7179字）