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1、第36卷第3期2017年6月海洋通報MARDiESC玨NCEBULLET口NV01.36.No.3Jun.2017Doi:10.11840/j.issn.1001-6392.2017.03.007自升式鉆井船插樁對鄰近平臺樁基影響的評價方法探討李書兆1,一,李亞1,魯曉兵z(1.中海油研究總院,北京100028;2.中國科學(xué)院力學(xué)研究所,北京100910)摘要:自升式鉆井船被廣泛用于中、淺水域油氣鉆井、勘探開發(fā)或平臺維修等海洋工程。通常,鉆井船靠作業(yè)臂工作,由于其極限長度有限,所以鉆井船作業(yè)時經(jīng)常緊鄰固定式導(dǎo)管架海洋平臺。軟弱土層中,鉆井船就位時插樁深度較深,插樁過程中大量土體
2、被排開,致使鄰近平臺樁基可能承受很大的附加荷載,這些附加荷載與樁基原有的荷載相疊加,很有可能超出其原有設(shè)計承載能力,引起嚴重的工程安全隱患和經(jīng)濟損失。如何可靠地評估自升式鉆井船插樁對鄰近導(dǎo)管架平臺樁基的影響,從而優(yōu)化鉆井船定位并指導(dǎo)導(dǎo)管架平臺樁基礎(chǔ)的早期設(shè)計,是我國當前海上油氣開發(fā)亟需解決的一個難點問題,迄今為止尚沒有形成一種被廣泛認可的方法?;诖耍到y(tǒng)闡述了評價自升式鉆井船插樁對鄰近樁基影響的方法,包括模型試驗、簡化理論方法和數(shù)值方法,分析了現(xiàn)有方法中存在的問題,并對未來的研究方向提出了建議,供讀者參考。關(guān)鍵詞:自升式鉆井船;樁靴貫入;導(dǎo)管架平臺樁基;土體大變形;數(shù)值方法;
3、模型試驗中圖分類號:P75文獻標識碼:A文章編號:1001—6932(2017)03—0293—09Discussionofmethodsevaluatingtheeffectsofthejack·-·upspudcanpenetrationontheadjacentplatformpileLIShu-zhaou,LIYal,LUXiao-bin92(1.CNOOCResearchInstitute,Beijing100028,China;2.InstituteofMechanics,ChineseAcademyofSciences,Beijing100190,China)Ab
4、stract:Jack—uprigisalwaysemployedtosomemarineengineering,forexample,oilandgasdrilling,explorationandexploitation,andmaintenanceplatform.Generally,sincethejack-uprigworksdependingonthemanipulatorwhichhasthelimitedlenlsth,itoftenworksincloseproximitytoapermanentjacketplatform.Thejack-upspudcan
5、penetratesdeeplyinthesoftclaydepositwhenthejack—uprigisinplace.Alargevolumeofsoilisdisplacedduringthespudcanpenetration,SOthattlleaajacentpilemaybesubjectedtoexcessinducedloads.Theseloadsaddedwiththeoriginalpileloadsmayexceedthenormaldesignbeatingcapacity,whichmaycauseseriousengineeringsafet
6、yhazardandeconomiclosses.Itisachallengeforthedevelopmentoftheoilandgasthathowtoreliablyevaluatetheeffectofthejack-upspudcanpenetrationontheadjacentjacketplatformpile,andthenoptimizethejack—uprigpositionandguidetheearlydesignofthejacketplatformpile.Thereisnowidelyacceptedmethodtodate.Basedont
7、hefact,thepaperelaboratesthemethodsevaluatingtheeffectofspudcanpenetrationontheadjacentpile,whichincludethemodeltests,simplifiedtheoryandnumericalapproaches,andthispaperanalyzestheexistingproblemsforthepresentmethodsandgivessomesuggestionsinregardt