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ID:52222344
大小:1.03 MB
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时间:2020-03-25
《道路约束条件下静压群桩挤土效应.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、第33卷第2期土木工程与管理学报Vo1.33No.22016年3月JournalofCivilEngineeringandManagementMar.2O16道路约束条件下静压群桩挤土效应李富荣,孙厚超(盐城工学院土木工程学院,江苏盐城224051)摘要:在分析静压沉桩挤土机理的基础上,采用室内模型试验,研究了道路约束条件下静压群桩挤土效应引起的地表土体变形,包括水平位移和隆起变形,并与工程实测进行了比较分析。试验结果表明,沉桩过程中,仅桩区内地表土体水平位移是先增大后减小,其余各处土体变形均是不断增大的,只是道路外侧
2、土体变形较小,可忽略不计;受道路约束影响,距桩区较近处地表土体水平位移减小,隆起变形增大,且桩区一道路间距离越小,该处土体变形越小,而距道路较近处地表土体变形越大;距道路越近,桩区一道路间地表土体变形越小;在道路另一侧,地表土体最大变形明显减小。工程实测表明,与室内试验结果相比,桩区一道路问土体变形呈现相同的变化规律,但受实际道路约束的影响,实测时道路另一侧土体基本未有变形。因此,静压桩施工必须考虑周边道路、建筑物等约束的影响。关键词:道路约束;静压群桩;挤土效应;模型试验;工程实测中图分类号:TU473.1文献标识码
3、:A文章编号:2095-0985(2016)02-0011-07SqueezingEfectsofJackedGroupPilesbyRoadConstraintLlFu—rong.SUNHou-chao(CivilEngineeringDepartment,YanchengInstituteofTechnology,Yancheng224051,China)Abstract:Basedontheanalysisofsqueezingeffectsmechanismofjackedpiles,thispaperused
4、laboratorymodeltest,researchedthesurfacesoildeformationcausedbythesqueezingeffectofjackedgrouppilesbyroadconstraint,includinghorizontaldisplacementandupheavaldeformation,andcomparedwiththeengineeringtest.Theresultsshowthat,onlythesurfacesoilhorizontaldisplacemen
5、tofpileareaincreasesatfirstthendecreases,theothersoildeformationareincreasingontheprocessofpiledriving,butthesoiloutsidetheroadhasthesmalldeformation,thatitcanbeneglected.ThesurfacesoilhofizontMdisplacementbecomesdecreasesandupheavaldeformationincreasesawayfromt
6、heDileareaaffectedbytheroadconstraint,andthesmallerthedistancebetweenthepileareaandroad,thesmallerthedeformation,butthebiggerthesoildeformationawayfromtheroad.Theclosertotheroad.thesurfacesoildeformationiSsmallerbetweenthepileareaandroad.Thesurfacesoilmaximumdef
7、ormationissignificantlyreducedontheothersideoftheroad.Theengineeringtestshowsthat,comparedwiththelaboratorytestresults,thesoildeformationshowedthesamevariationbetweenthepileareaandroad.butthesoilhasnotdeformedontheothersideofroadbecauseoftheactualroadconstraint.
8、Therefore,thesurroundingroad,buildingandotherconstraintsmustbeconsideredatthetimeofjackedpileconstruction.Keywords:roadconstraint;jackedgrouppiles;squeezingeffect;mod
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