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页数:6页
时间:2019-05-28
《盾构近距离穿越群桩旋喷加固效果分析》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、第20111期年(总111月58)铁道工程学报NOV2011JOURNALOFRAILWAYENGINEERINGSOCIETYNO.11(Ser.158)文章编号:1006—2106(2011)11—0098—06盾构近距离穿越群桩旋喷加固效果分析寇晓强杨京方叶国良曹永华(中交天津港湾工程研究院有限公司,天津300222)摘要:研究目的:在关键部位采用旋喷加固法减小盾构近接穿越过程中对已建构筑物的影响,是工程界较为普遍的施工保护措施。具体施工过程中加固效果如何,加固对已有构筑物应力及变形影响机理如何以及穿越过程中构筑物变形发生、发展规
2、律是怎样的,均值得深入细致研究。研究结论:通过采用有限元法对盾构开挖近距离穿越群桩过程的模拟,并与实测数据进行对比,得到:在盾构穿越桩基过程中,桩体的变形主要体现在上浮及侧向弯曲上;在未采用旋喷加固体的开挖过程中,计算与实测得到的桩体的最大上浮量均约为2Illm,而侧向变形最大约5.7ram;对比分析采用旋喷加固对桩基变形影响效果,得到旋喷加固可有效减小盾构穿越过程中桩基的侧向变形,其中加固后1号桩体减小侧向变形达28.5%,2号桩体减小侧向变形达42.2%。关键词:盾构隧道;近接施工;旋喷加固;数值模拟中图分类号:U455.43文献标
3、识码:AStudyonReinforcementEfectofShieldTunnelAdjacenttoExistingPileFoundationwithChurningPileKOUXiao—qiang,rANGJing—flang,YEGuo—liang,CAOYong—hua(CCCCTianjinPortEngineeringInstituteCo.Ltd,Tianjin300222,China)Abstract:Researchpurposes:Thechurningpileiscommonlyusedforthekeyp
4、artstoreducetheinfluenceoftheshieldconstructionontheaajacentbuilding.Therefore.itiSnecessarytodotheresearchonthereinforcementeffectduringtheconstruction,theinfluencesofthereinforcementonthestressanddeformationoftheexistingbuildingandtheoccurrenceanddevelopmentlawsofthede
5、formationofthebuildingduringtheshieldtunnelunder——passingtheexitingbuilding.Researchconclusions:FromthesimulationoftheprocessoftheshieldtunnelingthroughtheadjacentpileswiththeANSYSandthecomparisonofthesimulationresultwiththein—situmeasuredresults,itwasrevealedthatthemain
6、deformationofthepileswasupfloatingandlateralbanding.Intheprocessoftheexcavationofthenon—reinforcedbodybythechurningpile,themaximumcalculatedandmeasuredupfloatingvaluewas2mmwhilethemaximumlateraldeformationvolumewas5.7mm.Fromtheanalysisoftheinfluenceofthereinforcementbyth
7、echurningpileonthedeformationofthepilefoundation,itwasconcludedthereinforcementbythechurningpilecouldeffectivelycutthelateraldeformationofthepilefoundationduringshieldtunnelling.Concretelyspeaking,afterreinforcementbythechurningpile.thelateraldeformationofNo.1pilebodywas
8、cutby28.5%andthelateraldeformationofNo.2pilebodywascutby42.2%.Keywords:shieldtunnel;adjacentconstructio
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