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时间:2019-02-04
《静钻根植竹节桩荷载传递机理模型试验》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第49卷第3期浙江大学学报(工学版)Vol.49No.32015年3月JournalofZhejiangUniversity(EngineeringScience)Mar.2015DOI:10.3785/j.issn.1008-973X.2015.03.019静钻根植竹节桩荷载传递机理模型试验周佳锦1,2,龚晓南1,2,王奎华1,2,张日红3,严天龙3(1.浙江大学滨海与城市岩土工程研究中心,浙江杭州310058;2.浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058;3.浙东建材集团,浙江宁波315000)摘
2、要:针对静钻根植竹节桩这种新型组合桩基的荷载传递机理的问题,在模型槽中进行竹节桩的模型试验.通过埋设在竹节桩表面与水泥土中的应变片及桩底的土压力传感器对加载过程中桩身、桩端以及水泥土中的应力进行测量.模型试验结果表明:桩侧水泥土与桩端水泥土在荷载传递过程中所起作用不同,靠近桩端水泥土处桩侧水泥土中应力较大,在实际工程中需要提高该区域水泥土强度;模型试验测得的水泥土与桩周土极限侧摩阻力比现场试桩水泥土与桩周土的极限侧摩阻力大,在实际工程中搅拌水泥土时应提高搅拌均匀性以增加桩侧摩阻力;可以用传统桩基沉降计算公式计算静钻根植竹节
3、桩的桩端沉降.关键词:静钻根植工法;竹节桩;模型试验;水泥土;荷载传递;桩端沉降计算中图分类号:TU47文献标志码:A文章编号:1008-973X(2015)03-0531-07Modeltestonloadtransfermechanismofastaticdrillrootednodularpile1,2,GONGXiao-nan1,2,WANGKui-hua1,2,ZHANGRi-hong3,YANTian-long3ZHOUJia-jin(1.ResearchCenterofCoastalandUrbanGeote
4、chnicalEngineering,ZhejiangUniversity,Hangzhou310058,China;2.MOEKeyLaboratoryofSoftSoilsandGeoenvironmentalEngineering,ZhejiangUniversity,Hangzhou310058,China;3.ZDOONBuildingMaterialsGroup,Ningbo315000,China)Abstract:Forinvestigatingtheloadtransfermechanismoftheno
5、dularpile,amodeltestofthepilewasconductedinthemodelbox.Theaxialforceofthenodularpileandthemobilizedbaseloadweremeasuredbythestraingaugesattachedonthepileshaftandthesoilpressuresensorsunderneaththepilebasere-spectively,whilethestressinthecementedsoilwasmeasuredwith
6、thehelpofthePolyvinylchlorid(PVC)pipeonwhichthestraingaugeswereattached.Theexperimentalresultsshowthat:thefunctionofthece-mentedsoilalongtheshaftisdifferentfromthatofthecementedsoilattheenlargedpilebase;thestressinthecementedsoilalongtheshaftisenlargedsuddenlywhen
7、approachingthepilebase,thusthecementedsoilatthisareashouldbestrengthenedinactualprojects;theultimateskinfrictionofthemodelpileislar-gerthantheskinfrictioninthefieldtest,thustheskinfrictionshouldbeimprovedbyincreasingthehom-ogeneityofthecementedsoilinactualprojects
8、;thetheoreticaltipdisplacement-tiploadcurvesoftradition-alpilefoundationcanbeappliedforthenodularpile.Keywords:staticdrillrootedmethod;nodularpile;model
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