增压防堵真空预压加固吹填土对比试验研究-论文.pdf

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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