桩端桩侧后注浆钻孔灌注桩承载性能试验研究.pdf

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1、第31卷第7期2014年7月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentVoL31No．7Jul．2014doi：10．3969／j．issn．1002—0268．2014．07．003桩端桩侧后注浆钻子L灌注桩承载性能试验研究郭院成1，张景伟1，董晓星2(1．郑州大学土木工程学院，河南郑州450000；2．河南农业大学新校区建设指挥部，河南郑州450002)摘要：从钻孔灌注桩竖向承载机理及其承载能力影响因素出发，考虑桩端桩侧复式后注浆施工对钻孔灌

2、注桩端土层和桩侧泥皮的加固效应，初步探讨了郑州地区复式后注浆钻孔灌注桩的承载能力和变形特性，通过郑,k11某工程复式后注浆钻孔灌注桩现场足尺寸静载荷试验，研究了后注浆对钻孔灌注桩桩端阻力、桩侧摩阻力的提高效应，对桩端桩侧荷载分担比以及对沉降变形和整体竖向承载力的影响等。结果表明：桩侧注浆很好地改善了桩土界面力学能质，使侧阻力得到有效发挥；桩端注浆使沉渣层等桩端土层得以加固，桩端阻力提前发挥；复式注浆作用使桩土界面塑性位移减小，桩顶沉降变缓，灌注桩承载能力得到明显提高。关键词：道路工程；地基基础工程；承载性能；试验研究；复式后

3、注浆；钻孔灌注桩中图分类号：U416．1。TU473．1文献标识码：A文章编号：1002—0268(2014)07—0014—05ExperimentalStudyonBearingCapacityofBoredPilesUsingPileTipandSidePost—groutingTechnologyGUOYuan—chen91，ZHANGJing．weil，DONGXiao．xin92(1．SchoolofCivilEngineering，ZhengzhouUniversity，ZhengzhOUHenan450000

4、，China；2．NewCampusConstructionHeadquarters，HenanAgricultureUniversity，ZhengzhouHenan450002，China)Abstract：Inviewoftheverticalbearingmechanismofboredcast—in—placepilesandtheinfluencingfactorsoftheirbearingcapacity，consideringthereinforcementeffectonpiletipsoilandpil

5、esidemudcakebycompoundpost—groutingatpiletipandside，thebearingcapacityanddeformationpropertyofcompoundpost—groutedboredpilesinZhengzhouareaarepreliminarydiscussed．Byfull—scalestaticloadingtestonthepost-groutedboredpilesofaprojectinZhengzhou，theimprovingeffectofpile

6、tipresistanceandpilesidefrictionalresistance，theloadshareofpiletipandsidebycompositepost—grouting，anditsinfluenceonsettlementdeformationaswellasthewholeverticalbeatingcapacityareresearched．Theresultsshowthat(1)groutingatpilesidehasimprovedthemechanicalpropertyofint

7、erfacebetweenpileandsoil，whichmadetheresistanceofpilesideplayeffectively；(2)groutingatpiletiphasreinforcedsoillayerofpiletipsuchassedimentlayer，whichmadetheresistanceofpiletipplayinadvance；(3)compoundgroutinghasdecreasedtheplasticdisplacementofinterfacebetweenpilea

8、ndsoil，whichmadepiletipsettlementslowlyandobviouslyimprovedthebearingcapacityofboredpiles．Keywords：roadengineering；groundfoundationengineering；be