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Under microtremor dynamic response of geotechnical


Hongyue (CollegeofCivilEngineeringandArchitecture, ZhejiangUniversityHangzhou, 310027) AbstractThegroundmicro-tremorsignalsareobservedincoastalareaofFujian,[link widoczny dla zalogowanych], mainlyinFuzhou, andthesignalsareana. lyzedbyfastFouriertransformmethod (FFT). Wenotonlystudythecharacteristicsofthestructureoffrequency-spectrumandresponsetOgroundmicro. tremor,[link widoczny dla zalogowanych], butalsoinvestigatethefunctionwithfrequency-dependenceandfrequency-selectionofmicro-tremorfordifferentfoundationsoilstrata. Theresultsareasfollows: First,[link widoczny dla zalogowanych], itcanreflectvariationofthicknessofc0v. eringlayerandthedurationofpropagationtimeoftheshearwaveinoverburdenlayer. Second, thedurationofpropagationtimeoftheshearwaveino, rerburdenlayerandthethicknessofsiteoverburdenlayeraretwooftheimportantreaSOnsthataf. fectthepredominantperiodofthegroundmicro-tremor. Furthermore, softsoilofthegroundenlargespredominantperiodofthegroundmicro-tremorincertaindegree. Third · throughstudyingthecharacteristicsofthestructureoffrequency-spec-trum, wecanestimetethedynamicalcharacteristicsofgroundsoil. Fourth. withtheestablishmentofcorrelationetweenthepredominantperiodofthegroundmicro-tremorandthethicknessofoverburdenlayer, andthelengthofpropagationtimeofshearwaveintheoverburdenlayer,[link widoczny dla zalogowanych], ithelpsrevealandunderstandthecorrelationbetweengroundformationandthemicro-tremorpredominantperiod,[link widoczny dla zalogowanych], 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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