地脉动在福州市区地基土层场地评价中的应用

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1、第23卷第17期岩石力学与工程学报23(17)：3014～30202004年9月ChineseJournalofRockMechanicsandEngineeringSept.，2004*地脉动在福州市区地基土层场地评价中的应用12121许建聪简文彬尚岳全邱海容孙红月12(浙江大学建工学院防灾工程研究所杭州310027)(福州大学岩土工程与工程地质研究所福州350002)摘要根据实际观测资料研究了福州市区的地脉动特征以及地脉动频谱特性与场地有关参数之间的关系。结果表明，地脉动的频谱特性能够反映覆盖层厚度和地基土刚度的变化；可以通过研究场地地脉动的特性来评价研究区

2、岩土的动力特性；可以通过建立场地土覆盖层厚度、剪切波速与地脉动卓越周期之间的相关关系，揭示它们的内在规律。关键词岩土物探，地脉动，地基，场地评价，卓越周期，剪切波速分类号TU435文献标识码A文章编号1000-6915(2004)17-3014-07APPLICATIONOFMICROTREMORTOSITEEVALUATIONINFUZHOU12121XuJiancong，JianWenbin，ShangYuequan，QiuHairong，SunHongyue1(InstituteofDisasterPrevention，ZhejiangUniversity

3、，Hangzhou310027China)2(InstituteofGeotechnicalandGeologicalEngineering，FuzhouUniversity，Fuzhou350002China)AbstractThedynamicalcharacteristicsofgroundsoilandstructureoffrequencyspectrumofgroundmicrotremorinFuzhou，Fujianprovince，arestudiedinthispaper.Thegroundmicrotremorsignalswereobse

4、rved，andthesignalswereanalyzedbyfastFouriertransformmethod(FFT).Thecharacteristicsofstructureoffrequencyspectrumandresponseofgroundsoiltofrequencyofgroundmicrotremorarerevealed，andthefunctionofmicrotremorwithfrequency-dependenceandfrequency-selectionfordifferentfoundationsoilstratais

5、alsoresearched.Theresultsareshownasfollows.First，groundmicrotremorisakindofgeophysicsinformationwithabundantintension.Thefrequencycharacteristicsofgroundmicrotremorcanbeobtainedbyspectralanalysesofitssignals，whichcanbeusedtoprobeintodynamicalcharacteristicsofrockandsoilofstudiedarea.

6、Secondly，thereexistsafunctionwithfrequency-dependenceandfrequency-selectionfortheresponseofsitesoil.Thechangeofpredominantperiodofgroundmicrotremoriscloselyrelatedtotheformationofsitesoillayers，andmutuallycorrespondstothechangeofengineeringgeologicalconditionsofthesite.Therefore，thes

7、tructureandfeatureofdifferentfoundationsoilstratacanbedistinguishedwithdifferentkindsoffrequencyresponseofsite.Thirdly，thestructureofrockandsoillayersdirectlyinfluencesthespectralstructurecharacteristicsofgroundmicrotremor.Thecoveredlayerwiththestructureofdifferentfoundationsoilstrat

8、aisrelatedto