地下管道的瑞雷波动力学响应规律研究

利用有限元数值模拟方法，研究地下管道的瑞雷波响应规律.在单点激发单道接收的震动映像方式下， 瑞雷波遇管道的信号响应特征是产生弧形反射带.通过一系列含有地下管道的有限元模型的计算，拟合出管线 埋深h和瑞雷波波速VR、反射特征信号带顶端时间历程Δt的关系式，为管线埋深的快速判定提供一个量化标 准，并在工程实例中得到验证.经过不同管道埋深和不同偏移距相结合的模型的计算，总结偏移距变化对瑞雷 波响应特征信号的影响规律，为工程勘察中偏移距的合理选择提供理论依据和参考.
TheRayleighwaveresponsepatternofundergroundpipelineisstudiedbyusingfiniteelementnumerical simulationmethod. themodeofsingle-pointexcitationandsingle-channelreceivingvibrationmapping,thesignalre? sponseofRayleighwavesinpipelinesischaracterizedbythegenerationofarc-shapedreflectionbands.Throughaseries ofcalculationofthedifferentfiniteelementmodelsoftheundergroundpipes,themathematicalrelationamongthebur? ieddepthofpipelines(h)andRayleighwavespeed(VR)andthetimehistoryΔtatthetopofthearcreflectionsignalband wasfitted,whichcanprovideaquantitativestandardforrapiddeterminationofthepipelineburieddepthandisverified intheengineeringpractice.Bycalculatingthemodelsofthedifferentburieddepthofpipesanddifferentcannonsepara? tiondistance,theresponsepatternofthecannonseparationdistancechangeonRayleighwavewassummarized,provid? ingthetheoreticbasisandreferenceforthereasonableselectionofthecannonseparationdistanceingeotechnicalinves? tigation.