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Under microtremor dynamic response of geotechnical

Hongyue (CollegeofCivilEngineeringandArchitecture,[link widoczny dla zalogowanych], ZhejiangUniversityHangzhou,[link widoczny dla zalogowanych], 310027) AbstractThegroundmicro-tremorsignalsareobservedincoastalareaofFujian, mainlyinFuzhou, andthesignalsareana. lyzedbyfastFouriertransformmethod (FFT). Wenotonlystudythecharacteristicsofthestructureoffrequency-spectrumandresponsetOgroundmicro. tremor, butalsoinvestigatethefunctionwithfrequency-dependenceandfrequency-selectionofmicro-tremorfordifferentfoundationsoilstrata. Theresultsareasfollows: First, itcanreflectvariationofthicknessofc0v. eringlayerandthedurationofpropagationtimeoftheshearwaveinoverburdenlayer. Second, thedurationofpropagationtimeoftheshearwaveino,[link widoczny dla zalogowanych], rerburdenlayerandthethicknessofsiteoverburdenlayeraretwooftheimportantreaSOnsthataf. fectthepredominantperiodofthegroundmicro-tremor. Furthermore, softsoilofthegroundenlargespredominantperiodofthegroundmicro-tremorincertaindegree. Third · throughstudyingthecharacteristicsofthestructureoffrequency-spec-trum, wecanestimetethedynamicalcharacteristicsofgroundsoil. Fourth. withtheestablishmentofcorrelationetweenthepredominantperiodofthegroundmicro-tremorandthethicknessofoverburdenlayer, andthelengthofpropagationtimeofshearwaveintheoverburdenlayer,[link widoczny dla zalogowanych], ithelpsrevealandunderstandthecorrelationbetweengroundformationandthemicro-tremorpredominantperiod, andwillalsohelpdeveloptheapplicationofthegroundmicro-tremoranalysistechnigue, Keywords; pulsation; spectralstructure; stratumstructure: dynamicalresponse first author Xu Jiancong men. PhD . Engineers , October 1967 students. Tel : 013116788203; E-mail: xjcl008 @ zju. edu. cn

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