钢管-水泥土组合桩的抗拔性能.pdf

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1、第24卷第3期黑龙江科技大学学报Vol_24No．32014年5月JournalofHeilongjiangUniversityofScience&TechnologyMav2014钢管一水泥土组合桩的抗拔性能冯建光，何英萍(苏州大学城市轨道交通学院，江苏苏州215137)摘要：针对传统抗拔桩承载能力的局限性，根据劲性搅拌桩施工及荷载传递特点，提出钢管一水泥土组合抗拔桩形式，并借助ANSYS数值模拟软件，分析钢管直径及壁厚对组合桩承载能力及破坏模式的影响。结果表明：钢管直径对组合桩的抗拔性能影响显著。钢管直径小于0．4m时组合桩的承载力增幅很大，达

2、到0．4m时承栽力接近极限值：铜管直径为0．3～0．4m时组合桩破坏模式较合理。钢管壁厚对组合桩的抗拔性能影响较小。壁厚为10mm时组合桩的极限承载力增幅较大，钢管壁厚宜取10mm。钢管壁厚不影响组合桩的破坏模式，破坏均发生在钢管与外桩界面。该研究为改善水泥土搅拌桩的抗拔性能提供了参考。关键词：钢管一水泥土组合桩；抗拔性；有限元doi：10．3969／j．issn．2095-7262．2014．03．018中图分类号：TU473．1文章编号：2095—7262(2014)03—0306—06文献标志码：AEffectofsteelpipeonwit

3、hdrawalresistancecapacityofsteel-cementcompositepileFENGJianguang，HEYingping(SchoolofUrbanRailTranspotration，SoochowUniversity，Suzhou215137，China)Abstract：Aimedataddressingthelimitedbearingcapacityinherentinconventionalupliftpiles，thispaperproposesasteel—cementcompositepile，an

4、ewcombinationbuildingonthebehaviorofstruc—tureandloadtransferinreinforcedmixingpiles．Thepapergoesfurtherintoananalysisoftheeffectsofsteelpipediameterandthicknessonthecompositepilebearingcapacityandfailuremodes，usingnu—mericalsimulationsoftwareANSYS．Theanalysisfindsthatsteelpip

5、ediameterexertsasignificanteffectonthewithdrawa1resistancebehaviorofcompositepiles．asisdemonstratedwhenasteelpipewithadi—ameteroflessthan0．4m，providesasignificantincreaseinbearingcapacityofcompositepiles；asteelpipewithadiameterofupto0．4mgivescompositepilesthebearingcapacityclo

6、setothelimit；andasteelpipewithadiameterrangingfrom0．3to0．4maffordsamorereasonablefailuremode．Pipewallthicknesshasalesseffectonwithdrawalresistanceperformance，asisevidencedbythefactthata10am—thickpipewallprovidesagreaterincreaseintheultimatebearingcapacity，suggestingthatapipewa

7、llthicknessissettobe10mm．Pipewallthicknessproducesnoeffectonthefailuremode，duetothedamageoccurringonlyintheinterfacebetweensteelpipeandtheouterpile．Thispapermayserveasareferenceforimprovingtheperformanceofreinforcedcompositepile．Keywords：steel—cementcompositepile；withdrawalres

8、istance；finiteelement抗拔桩即承受上拔力的桩基，是桩基础的重要的加快，建(构)筑物承受上拔力的情况越来