浅层软土地基快速动力固结技术

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1、欢迎各位领导和专家莅临指导WELCOME2021/7/11浅层软土地基快速动力固结技术Lowenergydynamicconsolidationcombinedwithlightwell-pointdewatering同济大学地基基础研究所InstituteofSoilFoundationTongjiUniversity2021/7/11概述IntroductionThismethodisapplicabletosandysoil,sandysilt,miscellaneousfill,etc.,thecoefficientofpermeabilityofwhich

2、isrelativelyhigh(thecoefficientofpermeability,ko,islargerthan10-5).2021/7/112021/7/112021/7/11低能量强夯法结合轻型井点降水施工方案Lowenergydynamicconsolidationcombinedwithlightwell-pointdewatering1.加固效果和工期ReinforcingEffectandConstructionperiod2．低能量强夯法的加固原理reinforcementmechanismoflowenergydynamicconsolid

3、ation3．施工方案constructionscheme1）.施工降水dewatering2）.夯击工艺参数tampingparametersandtechnique3）.低能量强夯设备equipmentforlowenergyDCM4）.收锤参考标准tamping-stopstandard5）.检测和信息化施工monitorandinformationconstruction6）.施工程序和步骤constructionproceduresandsteps4.已成功的大面积施工中应用实例casehistory2021/7/111.加固效果和工效Reinforcin

4、gEffectandConstructionEfficiency加固效果(ReinforcingEffect)Insandysoils,theSPTblowcount,N63.5,canreachto12~15;theCPTvaluecanreachto5~8MpaandthePLTbearingcapacityto150~200Kpa.加固深度(treatmentdepth)4-6m工效ConstructionEfficiency一个月大约能施工100，000m2，About100,000m2canbefinishedinonemonth.2021/7/112．低

5、能量强夯法的加固原理Reinforcementmechanismoflowenergydynamicconsolidation2021/7/112021/7/113．施工方案Constructionplan2021/7/111）.施工降水dewatering场地降水采用真空强排水(well-pointdewatering)，在地下水位降至地面下2.5m(undergroundwaterdewateredto2.5mbelowgroundsurface)以下时开始进行第一遍强夯(firstpass)。。每遍强夯后进行强排水dewateringaftereachtamp

6、ingpass2021/7/113）.低能量强夯设备equipmentforlowenergyDCM履带式吊车(25tcapacitytrackcrane)，夯锤质量(tamperweight)10~12t，锤底直径(diameterofthetamperbottom)2.5m~3m套轻型井点降水设备lightwell-pointdewateringequipment2021/7/114）.夯击工艺参数tampingparametersandtechnique2021/7/115）.收锤参考标准tamping-stopstandard（1）夯坑周围出现明显隆起和侧向

7、位移generateapparentheaveorlateraldisplacement;（2）后一击夯沉量大于前一夯沉量cratercausedbythelatterpoundingislargerthantheformerpounding（3）当夯坑深度≥80cm时。Craterdepthismorethan(orequalto)80cm2021/7/116）.检测与信息化施工monitorandinformationconstruction（1）检测内容monitorcontenta．沉降观测settlementmeasureb．静力触探试验CPTtest