[建筑]高速铁路论文：软弱土地基盾构隧道高速列车动力响应分析

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1、高速铁路论文：软弱土地基盾构隧道高速列车动力响应分析【中文摘要】近年来高速铁路在世界范围内广泛发展,我国的高铁建设发展迅猛,高铁技术逐渐成熟,但与此同时铁路交通振动引发的问题凸现出来。为了服务于经济发展,高速铁路需连接各经济发达的地区,多数必经过长江三角洲、珠江三角洲等地区,铁路隧道多修建在深厚的饱和软粘土、松散砂土等软弱地基中。在高铁列车振动荷载反复的激扰下,孔隙水压力骤升,周围的粘土阻断排水,孔隙水压力难以弥散,最终液化失去抗剪强度,导致隧道沉降,影响立车行驶的平稳程度,轻则影响旅客乘车舒适度,重则影响行车安全。本文将列车振动和砂土液化相结合进行了分析

2、和计算。首先,以地铁列车振动研究为基础,讨论列车振动荷载的机理,选取人工数定激励力施加在以Euler梁模拟的轨道上,计算得到无砟轨道承轨台支反力,然后,将支反力施加到隧道-围岩模型上进行计算。计算中结合饱和土动力固结理论,采用Finn-Seed模式,进行了在高速列车动荷载激扰下的水-土二相流固耦合分析。分别分析了①均匀地层中盾构隧道的动力响应,以及地应力和孔隙水压力分布规律；②长期重复列车何在作用下,隧道结构的动力响应规律,以及地应力的变化规律和孔隙水压力的集聚和弥散规律。【英文摘要】Whilethetechnologyofhigh-speedrailwa

3、ygraduallyapproachingmatureunderthecircumstanceofhigh-speedrailwaydevelopinggloballyandsoardevelopmentofhigh-speedrailwayconstructionindomain,theproblemcausedbyvibrationofrailwaycommunicationbecameprominent.ForservingeconomygrowthbyconnectingthemajorcitieslocatedinYangtzeRiverdelt

4、a,PearlRiverdeltaandetc,railwaytunnelsfrequentlyembeddedinthicksoftsoilassaturatedclayorunconsolidatedsand.Exposedtotrainvibrationexcitation,porepressuresuddenlysoaranddissipationdelayedduetoblockeddrainageofsurroundingclay,whichfinallyleadtoliquefactionandshearstrengthloss,tunnel

5、subsidence,infectedsmoothlyrunningandcomfortofpassengereventhesafetyofrailwaytransportation.Theanalysisofthisdissertationcombinedthetrainvibrationandsandliquefaction.First,discussingmechanismofhigh-speedtrainvibrationbasedonreviewingrelevantsubwayresearch,artificiallynumberedexcit

6、ationforceisappliedtothetracksimulatedasunlimitedEuler-Bernoullibeamtogainthereactionforceoftracksupportingplatformofballastlesstrackstructureviacalculation.Thenthisforceisexertedtotunnel-groundmodeltocalculatedanalysis.CombiningdynamicconsolidationtheoryofsaturatedsoilandusingFin

7、n-Seedmodel,accordingtofluid-solidcouplingsituationofwater-soilundergoingvibrationinducedbyhigh-speedtrain,thisdissertationrespectivelyanalyzed①dynamicresponseofshieldedtunnelandthefeatureofgroundstressandporepressdistribution;②dynamicresponseoftunnelstructure,variationofstressfie

8、ldandthestimulationanddiffusionof