强夯_CFG桩复合地基在较厚回填土中的应用

43220131BuildingStructureVol．43No．2Jan．2013+CFG1211113110004520171003014000+CFG。CFG。、。CFGTU472.99A1002-848X201302-0079-04ApplicationofdynamiccompactionandCFGpilecompositefoundationinthetreatmentofthickbackfillZhengYu1WangTianyong2YangZheng1JinCanguo1WangJianhua1ZhangXiangyong1DongSuqin31BeijingInstituteofArchitecturalDesignBeijing100045China2ErdosCityInvestmentRealEstateDevelopmentCo．Ltd．Erdos017100China3DepartmentofArchitecturalEngineeringTechnologyofInnerMongoliaAgriculturalUniversityBaotou014000ChinaAbstractThedesignandconstructionmethodofdynamiccompactionpluscementfly-ashgraveCFGpilewereintroducedtoenhancethebearingcapacityoffoundationandcontrolfoundationsettlementinthickbackfillbyanengineeringexample．ThestandardpenetrationtestandstaticloadingtestwerecarriedouttotopsoilcompactedbydynamiccompactionandthebearingcapacityofthecompositefoundationprocessedbydynamiccompactionandCFGwasdetectedbystaticloadingtestofsinglepilecompositefoundationandverticalcompressionstaticloadingtestofsinglepile．Theresultsshowthatthebearingcapacityanddeformationofcompositefoundationareacceptableandcanmeettherequirementofrelatedcodes．Moreovertheengineeringexampleshowsthismethodcanshortentheconstructionperiodandiseconomicconvenientandsafe．Keywordsdynamiccompactionc[e-mail]。1。9111#、6#2987.950m2#～5#2679.550m7#9#2881.650m8#3087.450m2m217m2。-+。1282.10～1282.40m。21277.60m、、12lm。3117.3m12.2m。。520～600kPa。1CFG2。。20131/m/m/g/cm3Es1-2/MPaE0/MPaφ/°c/kPafak/kPa7.80～17.301272.85～1280.74①0.70～10.001269.77～1278.821.636.018140②4.40～18.101262.66～1272.741.9218.0180③4.70～19.001252.21～1260.382.1222.024250④0.70～4.301249.61～1258.272.2616.025.02230350⑤2.3218.085.040756502qsik/kPaqpk/kPaqsik/kPaqpk/kPa①5050②5050③60180015≤l≤3065380015≤l≤30④100140015≤l≤30110160015≤l≤30⑤140220030≤l160260030≤lCFG。CFG1.6～9.6m。、5.6m、。。7#8#9#121。11484.32m27#8#9#1477.32m1484.32m37#8#9#。———3000kN·m6.5m×6.5m6～101m250mm———3000kN·m6～101m250mm———1000kN·m21/4。4。29zk1～zk29zk1zk2zk37#8#9#12Jz1～Jz12Jz1Jz27#9#。2。3N=16～31N=22。23NN11616～31224.0250.18380kPa40kPa。-p-s3。p-s。p-s360～440kPap-s。4。160～200kPa22%12fak=181.7kPa08432．+CFG3-4/kPa/MPa/kPa/MPaJz120020.8Jz718018.1Jz218025.5Jz816013.5Jz320013.5Jz920016.6Jz418014.4Jz1020015.4Jz516017.6Jz1118015.2Jz618017.4Jz1216012.916.7MPaqsik=50kPa。5CFG5.1CFG2#520kPa50mm。CFG500mm1.7mC2019m③1m。29.2.629.2.7Ra=1100kN。CFG2fspk=mRaAp+β1()－mfsk1fspkfspk≥520kPafsk181.7kPaβ0.85。fspk=525kPa＞520kPa。29.2.835.3.52#34.3mm。+。44。CFG350kPa50mm0.002LLmm。JC1400mm1.5mC2014m③1m。JC1Ra=680kNfspk=448kPa＞350kPa16.3mm。JC1JC418.2mm1.9mm＜0.002L=16.2mm。、。45.2CFGCFG1121。CFG。6#6m×6m、。16m20min、。0.4m1.2m25m。。66.1332418201324。2#3ZH-1ZH-2ZH-3。。5。336。5/min/kPa/kPa/mmZH-1168013010407.71ZH-2168013010407.59ZH-3168013010407.526/min/kN/kN/mmZH-1150044022004.86ZH-2150044022004.65ZH-3150044022005.05pq-s56。+CFG2CFG4。5ZH-1p-s6ZH-1q-s6.2。2#。2#678。3、。814.4mm570%30mm。72#29．2．835．3．5775。7。82#-7/m2/mm/mm/mm/mm1#67721．036.616.323.32#66419.534.314.420.63#52919.934.013.519.34#53219.934.014.320.45#66419.534.313.118.76#67721.036.615.722.57#～9#139119.634.614.320.47+CFG。。+CFG、、。2728432．/mm13XYXYRH1TG04528.650.673.951.3TH2TG04527.180.054.933.4TH3TG04545.546.673.866.233.759.167.550.3SAP2000。4.3.1、14。L/400+L/5002L。14+/mm/mm/mm1751/560151/2800901/4672791/506221/18181001/4004.3.2121、。4.3.310.55280s1.81Hz。《》CJJ69—953Hz。34SAP20001F()t=G1+sin2πT()[]tG650NT10.55280s。0.13118m/s20.5m/s2。51、、。2。3。。4。。。5。6。1．MOMAJ．200636S110-14．2GB50017—2003S．2003．3．FRPJ．201128314-22．4．J．2008388106-110．821．J．200030553-56．2JGJ79—2002S．2002．3GB50007—2011S．2012．4．CFGJ．200538787-91．5．M．2007．72