组合荷载下海上半埋入多叶螺旋桩水平动力响应分析

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关键词：螺旋桩；等效刚度；成层饱和土；Euler梁模型；水平动力响应 中图分类号：TU473 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202308010

Horizontal dynamic response of offshore extended helical pile withmultiple helixesunder combined loads

JI Hongxuan，WU Wenbing，GAO Tangzhe， ZHANG Yunpeng （DepartmentofExplorationandFoundation Engineering，Facultyof Engineering，China Universityof Geosciences（Wuhan）， Wuhan 430074，China）

Abstract：Basedonthe Biot'sporoelasticmodelandtheEulerBernoulibeamequations，thedynamicresponseof extended helical pilefoundations withmultiplehelixesisstudied.Theequivalentstifessmodelisusedtosimulatethehelixesonthehelicalpile. Withtheutilizationoftheintegralransfor，thevariableseparationmethods，andtheimpedancematrix transfermethod，theanalyticalsolutiontothedynamicresponseofhelicalpiles withmultiplehelixes isderived.Throughthecomparisons withthesimpli fiedanalyticalsolutiosandtheexperimentalesults，tecoectessofteproposedodelisjustified.Finall，withhepta tionofacomprehensiveparametricstudy，somedominantimpactfactorsonthedynamicresponsesarerevealed，andtheoptimal designschemeissuggestedaccordingly.Themainconclusionofthisstudycanbeconcludedas：Anincreaseoftheextensionratio ofhelix willicreasethecompleximpedanceandresonancefrequencyattepiletopoftehelicalpile.Anincreaseoftheratioof helixspacingtowidthwillincreasethecompleximpedanceoftepiletop，buttheefectonteresonancefrequencyisnotsignifi cant.Anincreaseoftheverticalstaticloadatthetopoftepilewillsgnificantlyeducethecompleximpedaneandresonancefre quency atthe pile top.The helix inclination has an optimalrange in theefect ofcomplex impedanceofthe pile top.

Keywords：helicalpile;equivalentstiffness;layered saturatedsoil;Eulerbeammodel;horizontal dynamic response

桩基础是海洋能源工程尤其是海上风电工程中使用最广泛的基础形式，据统计，全球范围内超过80% 的海上风电使用大直径单桩基础[1]。（剩余14898字）