組合荷載下海上半埋入多葉螺旋樁水平動(dòng)力響應(yīng)分析

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關(guān)鍵詞：螺旋樁；等效剛度；成層飽和土；Euler梁模型；水平動(dòng)力響應(yīng) 中圖分類號(hào)：TU473 文獻(xiàn)標(biāo)志碼：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，F(xiàn)acultyof 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

樁基礎(chǔ)是海洋能源工程尤其是海上風(fēng)電工程中使用最廣泛的基礎(chǔ)形式，據(jù)統(tǒng)計(jì)，全球范圍內(nèi)超過80% 的海上風(fēng)電使用大直徑單樁基礎(chǔ)[1]。（剩余14898字）