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时间:2020-05-14
《考虑支撑架设时机的基坑围护结构计算方法.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2013年11月铁道工程学报NOV2013第11期(总182)JOURNALOFRAILWAYENGINEERINGSOCIETYNO.11(Ser.182)文章编号:1006—2106(2013)11—0013—05考虑支撑架设时机的基坑围护结构计算方法刘成禹徐代宏2(1.福州大学,福州350108;2.中铁二局集团有限公司,成都610031)摘要:研究目的:本文针对弹性地基梁全量法计算基坑围护结构内力和位移时,内支撑是预加的、计算条件与施工实际不符的不足,提出一种考虑支撑架设时机的围护结构位移和内力计算方法,以提高计算的准确性。研究结论:(1)采用弹性地基梁杆系有
2、限元全量法计算围护结构内力和位移时,将内支撑定义为具有初始间隙的仅受压的杆单元,并将支撑架设时围护桩(或围护墙)在该道支撑处已发生的水平位移设置为初始间隙宽度,就可较好地模拟支撑架立时机,使围护结构内力和位移的计算结果更加符合工程实际;(2)弹性地基梁全量法计算基坑围护结构内力和位移时,不考虑支撑架设时机会使围护桩(或围护墙)的侧向位移和弯矩计算值偏小,这是不安全的;(3)本文的研究成果对基坑围护结构的设计和施工有指导意义。关键词:围护结构;内力;位移;内支撑;架立时机中图分类号:TU47文献标识码:ACalculationMethodofFoundationDitc
3、hEnclosureStructureConsideredtheErectionTimeofBracingsLIUCheng—yu.XUDai—hong(1.FuzhouUniversity,Fuzhou,Fujian350108,China;2.ChinaRailwayErjuCo.Ltd,Chengdu,Sichuan610081,China)Abstract:Researchpurposes:Asusingthecompleteanalysismethodforbeamonelasticfoundationcalculatetheinternalforceasw
4、ellasthedisplacementofthedeepfoundationditchenclosurestructure,theinternalbracingswasappliedinadvancedandthecalculationconditionwasinconsistentwiththeactualoftheconstruction,amethodthatconsideredtheerectiontimeoftheinnerbracingswasproposedinthispaperinordertoimprovethecalculationaccurac
5、y·Researchconclusions:(1)Asthebar—systemFEMcompleteanalysismethodforbeamonelasticfoundationwasadoptedtocalculatetheinternalforceandthedisplacementofthefoundationditchenclosurestructure,theinnerbracingwasdefinedascompression—onlybarunitwithinitialgap,andthewidthoftheinitialgapwasequaltot
6、helateraldisplacementoffenderpiles(orenclosurewal1)onthepointwhichtheinnerbracingswereappliedattheerectiontime.Withthattheerectiontimeofthebracingswereconsideredinthemodel,whichmakestheintemalforceanddisplacementcalculationsoftheenclosurestructureaccordtheactualbetter.(2)Withoutconsider
7、ingtheerectiontimeofthebracingswhileusingthecompleteanalysismethodforbeamonelasticfoundation,thecalculatedvaluesofthelateraldisplacementsandmomentsofthefenderpiles(orenclosurewal1)weresmaller,thatwasnotsafetyinpractice.(3)ResearchfindingsofthispaperCanprovidereferenceforthedesi
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