浅层软土地基快速动力固结技术.ppt

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1、欢迎各位领导和专家莅临指导WELCOME2021/7/30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InstituteofSoilFoundationTongjiUniversity2021/7/30概述IntroductionThismethodisapplicabletosandysoil,sandysilt,miscellaneousfill,etc.,thecoefficientofpermeabilityofwh

2、ichisrelativelyhigh(thecoefficientofpermeability,ko,islargerthan10-5).2021/7/302021/7/302021/7/30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reinforcementmechanismoflowenergydynamicco

3、nsolidation3．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casehistory2021/7/301.加固效果和工效R

4、einforcingEffectandConstructionEfficiency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.

5、2021/7/302．低能量强夯法的加固原理Reinforcementmechanismoflowenergydynamicconsolidation2021/7/302021/7/303．施工方案Constructionplan2021/7/301）.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dewateri

6、ngaftereachtampingpass2021/7/303）.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-pointdewateringequipment2021/7/304）.夯击工艺参数tampingparametersandtechnique2021/7/305）.收锤参考标准tamping-stopstanda

7、rd（1）夯坑周围出现明显隆起和侧向位移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)80cm2021/7/306）.检测与信息化施工monitorandinformationconstruction（1）检测内容monitorcontenta．沉降观测settlementmea

8、sureb．静力触探试验CPTtest