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《增压防堵真空预压加固吹填土对比试验研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第58卷第1期铁道标准设计V01.58NO.12014年1月RAILWAYSTANDARDDESIGNJanuary2014文章编号:1004—2954(2014)01—0028—06增压防堵真空预压加固吹填土对比试验研究刘浩,佘学鹏,崔俊杰,梁英俊(中铁工程设计咨询集团有限公司,北京100055)摘要:基于天津新港北铁路集装箱中心站工程试验段的对比试验,探讨增压防堵真空预压和常规真空预压、直排式真空预压的区别,研究了增压防堵真空预压和直排式真空预压加固效果的差异。试验结果表明:增压防堵真空预压采用手型接头将
2、PDPS整体式排水板和钢丝软管相连作为水平排水系统,替代常规真空预压的中粗砂垫层,提高了排水板内真空强度和真空作用能效,能有效地降低工程造价,且更符合环保的要求;增压防堵真空预压较直排式真空预压在初期沉降速率更快,相同工期内沉降更大,地基加固效果更显著。关键词:地基加固;增压防堵真空预压;直排式真空预压;固结沉降;孔隙水压力;十字板剪切强度中图分类号:TU433文献标识码:ADOI:l0.13238/j.issn.1004—2954.2014.01.007ComparativeExperimentStudyo
3、ntheStrengtheningofDredgerFillUsingVacuumPreloadingMethodBasedonPressurizationandAnti·cloggingTechnologyLIUHao,YUXue—peng,CUIJun—jie,LIANGYing—jun(ChinaRailwayEngineeringConsultingGroupCo.,Ltd.,Beijing100055,China)Abstract:Incombinationwiththecomparativeexp
4、erimentataexperimentsectionofTianjinXingangNorthrailwaycontainercenterstation,thepaperdiscussedthedifferencesamongthreekindsofvacuumpreloadingmethods:thevacuumpreloadingmethodbasedonpressurizationandanti—cloggingtechnology,thetraditionalvacuumpreloadingmeth
5、od,andthedirectvacuumpreloadingmethod.Alsothepaperresearchedthedifferenceofstrengtheningeffectsbetweenthedirectvacuumpreloadingmethodandthevacuumpreloadingmethodwhichisbasedonpressurizationandanti—cloggingtechnology.Theexperimentstudyresultsareasfollows:(a)
6、ByusingspecialjointstoconnectthePDPSintegrateddrainboardwiththesteelwirehoseSOastofunctionasahorizontaldrainagesystem,insteadofthemedium—grainedsandcushionadoptedintraditionalvacuumpreloadingmethod,thevacuumpreloadingmethodbasedonpressurizationandanti—clogg
7、ingtechnologycanimprovethevacuumstrengthandeficiencyofdrainboard,caneffectivelyreduceprojectcost,andcanmuchmoreaccordwithenvironmentalprotectionrequirement.(b)Comparedwithdirectvacuumpreloadingmethod,thevacuumpreloadingmethodbasedonpressurizationandanti—clo
8、ggingtechnologycanpresentafastersettlementvelocityininitialperiodandalargersettlementvolumeinthesameworkingperiod.(C)Afterbeingstrengthenedbythevacuumpreloadingmethodbasedonpressurizationandanti—cloggi
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