国外地质勘探报告解读要点

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:,。:;;;;;:TU471.99:A:1001-6171(2009)03-0021-05:,300400;:2009-02-23;:□□,,,,。,,。,,、、,,,,。,,。1,———(LoadandResistanceFactorDesignLRFD)(AllowableStressDesignASD)。,,ASD。Eurocode7LRFD。ASD,,。:IBC2006,D+L+W(D,L,W),Fk=2~4(Fk=3)。LRFD,,(),:Eurocode71~1.3,tan’1.2~1.25、C’1.5~1.8。:,。InterpretationPointofGeologicalReportfromAbroadCHENHan-xuan,LIUDa-yue(TianjinCementIndustryDesignandResearchInstituteCo.,Ltd.Tianjin,300400)Abstract:ComparisonismadeonthedeterminationmethodofallowedbedbearingbetweengeologicalreportsofChinaandabroad.Analysisismadeinthispapertodeterminethecorrectionfactorofbedbearingcapacity.Keywords:Geologicalprospecting;Bedbearing;BedspecificationcodeofAmerica;BedspecificationcodeofGermany;BedspecificationcodeofBritain;BedspecificationofChina212009/3,D+L+0.6W。,,,D+0.6L。,,2(4.1),,P1/4,3(4.3)。2。ASTMD2487;DIN18196。,。24。:G=gravel=S=sand=M=silt=C=clay=O=organic=:W=well-graded=P=poorly-graded=M=silty=C=clayey=L=lowplasticity=H=highplasticity=Pt,。:SC;GW-GC。,,1。1,,50%,。3,,,,。,,,,。,(2~4cm)。,,。DIN1054,,1~4cm。,。IBC-2006,。4,。“、,”。。,[2][(IBC-2006),22CEMENTTECHNOLOGY3/2009,,[2]]Eurocode7,DIN1054BSI。。4.1(PBT)。,(P-S)。3m,0.5m。。“”。,:(1)P~S,;(2)2,;(3),0.25~0.5m2,s/b=0.01~0.15,(S5~10mm)。(ASTMD1194),,,。。。,P~S(25mm)。2~4。BS1377-9。4.2,,。(SPT)、(DPT)、(CPT)、(VST)(DMT)。SPTCPT。;,C、,。,,。,,。。,。[2]([2][4](1)akd,(1)bkd,。)SPTNn(1),1″(25.4mm)。1″,(2)。B≤1.2m:qa1=NnF1(1)aB>1.2m:qa1=NnF1(B+0.3B)2×kd(1)bkd=1+0.33(DB)≤1.33qa=qa1×S2.5(2):qa———S(cm)qa1———2.5cmS———(cm)Nn———B———(m)D———(m)F1———N550.05,N700.04F2———N550.08,N700.06,,,N63.563.5kg。,,。N55N7055%70%。55%70%。60%。,,,[2][4]。4.3,。。232009/3,,。:(Terzaghi)(1943)、(Meyerhof)(1951、1963)、(Hansen)(1970)(Vesic)(1973、1975),[2][4]。:qu=C’Ncξc+12Bγ’Nγξγ+σp’Nqξq(3):qu———,kPaC’———,kPa’———γ’———σp’———D,:σp’=γ’D’DγD’———D———B———()Nc、Nγ、Nq———f(’),[2]ξc、ξγ、ξq———。、、、、、、、。,[2]。,[2]。Eurocode7。BSIDIN。,1/4()。[5]:“”(DB29-20-2000)30,3。:(1),。,“,。”。(2)(3),,(5.2)。(3),,B'L',q2。q=pB′L′≤qa(4):B′=B-2eB,L′=L-2eLeB=MBP,eL=MLP(eBeLB/6L/6)B,L—MBML—BLP—,qu,(3):(1)BB′;(2)ξc、ξr、ξq,BL,B′、L′B、L。4.4,。,:TJ7-74GBJ7-89。,,GB50007-2002。,。:IBC-2006、[2]、BSIDIN1054。DIN1054:24CEMENTTECHNOLOGY3/2009,2,,,。5,、、。,。。5.1,,。[4][6],。(3),,。,,,,。,,。[6],,(3)。。。。DIN1054,1.5m。2m()3m(),1m,2m3m10%。5m。[2](1)a(1)b,,。,,。5.2,。,,。(3),(5)、(6);,(7)、(8)。qa=quFk(5)q′a=quFk-γD(6)q′a=qu-γDFk(6)aq′a=qu′Fk(7)qa=qu′Fk+γD(8):qu—qu′—qa—qa′—Fk—,3γ—D—,(6)a[2],(6)。,,,,qa-qa′=γD(ηd=1)。,0.5m,,ηd=1~4.4。。。5.3,1.2。,,IBC-20061.33,BSI1.25,Eurocode71.3;。,1.2。,(9):q=PBL+6MBL2≤qa(9)(42)252009/325,%,%+80μm+0.2mm0409130.762.44.22.712.6-0611266.529.8-3.714.2-0613345.749.61.13.621.54.106164886.33.52.218.7-27,%,MPa,MPafCaOKHKHˉSMAM1d3d28d1d3d28d3250.740.630.950.942.871.464.26.59.518.537.263.54280.950.460.9740.9593.741.084.06.29.217.234.658.0291.000.400.9670.9513.331.344.66.99.520.639.461.026,%SiO2Al2O3Fe2O3CaOMgOSO3K2ONa2O040935.5013.312.732.1642.571.57--->45μm34.6514.772.462.5241.511.95---061135.7513.372.162.2443.191.02--->80μm35.3915.311.232.6042.051.26---061335.3813.542.302.3143.161.140.08~0.2mm35.4013.921.782.4343.421.361.050.410.05>0.2mm35.4915.401.682.2142.501.300.730.410.05061635.2313.253.081.9742.951.241.290.310.020.08~0.2mm35.6214.191.652.1542.811.631.180.200.02>0.2mm36.0514.221.611.5643.211.940.800.190.02,,———3。,,,,10%。,、,,15%;,0613,0.080mm21.5%,,0.2mm4.1%,SiO2。,,2%,0.50%,。4.3,,,(27)。(20、21),(fSiO2)1350℃~1400℃,1450℃;、?,,。5(fSiO2),,,,,。、、,;,、。笪(25):q———P、M———B、L———(4)。。(9),=L/6,qmax=2P/BL;(4)qmax=1.5P/BL。,(4),,,;。(9),,,,。。:[1]InternationalBuildingCode[S].2006.[2]EM1110-1-1905BearingCapactityofSoils[S].[3]EM1110-1-1904SettlementAnalysis[S].[4][]·E·,()[M]..[5],.()[M]..[6]DonaldPCoduto,FoundationDesign:PrinciplesandPractices(2NDEdition)[M].[7]BSIBritishStandandCodeofPracticeforFoundations[M].[8]DIN1054-1976-11Baugrund-SicherheitsnachweiseimErd-undGrundbau[M].[9]Eurocode7GeotechnicaldesignDraft[S].笪42CEMENTTECHNOLOGY3/2009

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