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朱丽霞((),430074):,,,,,,,:,,,:TU472:B:10043152(2010)060042041,,,,,(1)c,a,ac,acab,,,1,,,,(2):2(1),,,=(1/3~2/3)D,D(2),,()x:eq=qhKa(1)ea=hKa(2)ep=hKp(3)x=(eq+ea)/(ep-ea)(4):eq(kN/m2);ea(kN/m2);ep(kN/m2);qh(kN/m3);(kN/m3);h(m);Ka;Kp:20091128:,,1985,,,(3),,,,,,(4)(5)(6),,,,,K=1.1~1.3(7),22.1,,,,3.28m,9m,5.0m~11.66m,75~90,,1.60m~6.80m,,,,!,2.2(Q24)(Q14),,,:∀(Q2ml4):,,#(Qeol4):,~,,,,;,,,;,,;∃(Qeol4):,,,,,,,,~;,,%(Qal+pl4):,,,,,11()c(kPa)(kN/m3)(m)∀151018.03#6.618.519.59∃8.522.019.6102.3,,,,,,,,,,qh=60kN/m2,,(2)D,tg(45-D)=H2tg2(45-2)-4cHtg(45-2)+4c2H2(5)Ka(c,c=20kPa=9=19kN/m3)Ka=tg2(45-D)=0.4133(6),,,,,,=15,b=D=24.5Kp=[cosbcos-sin(b+)sinb]2=3.76(7)(3),(2),(4):x=eq+eaep-ea=99.1920&(3.79-0.4133)=1.5m436:32h(m)e(kN/m2)A024.8B241.33C4.562D782.66E999.19F10.502.4,,,(4),BCD,F,,∋(ABBCCDDF(5)45MBA=12eAh2AB+12&23(eB-eA)h2AB(8)R)B=eAhAB+12(eB-eA)hAB(9)MCB=7eB+8(eC-eB)120h2BC-MBA2(10)R∗B=[12eBh2BC+12&13(eC-eB)h2BC-MC+MB]/hBC(11)R)C=[12eBh2BC+12&23(eB-eC)h2BC+MC-MB]/hBC(12)MCD=eC12h2CD-(eD-eC)30h2CD(13)MDC=eC12h2CD+(eD-eC)20h2CD(14)R∗C=[12eCh2CD+12&13(eD-eC)h2CD-MD+MC]/hCD(15)R)D=[12eCh2CD+12&23(eD-eC)h2CD+MD-MC]/hCD(16)MDF=-eD8h2DE(2-hDEhDF)2-(eE-eD)24h2DE&[8-9hDEhDF+125(hDEhDF)2]-eEh2EF6[1-35(hEFhDF)2](17)R∗D=[eDhDE(hDE2+hEF)+(eE-eD)2hDE&(23hDE+hEF)+12&23eEh2EF-MD]/hDF(18)RF=[12eDh2DE+12&23(eE-eD)h2DE+12&eE&hEF&(hDE+hEF3)+MD]/hDF(19):RB=R)B+R∗B(20)RC=R)C+R∗C(21)RD=R)D+R∗D(22),(3),,(4)3(kNm)BCD0.430.570.650.3560.62-60.6210.59-36.638.75-127.4828.857.6731.0660.62-60.62-1.29.39-1.59-9.39-0.896-96,(4)4420104(kN)(kNm)B105.91-60.62C210.13-9.39D202.97-96F79.240F,y=6RF(Kp-Ka)=2.65m(23),Dmin:Dmin=1.2(x+y)=5m(24),L:L=H+!Dmin=16m(25),%0.5m,25m,,,3(1),(2),,,,,(3),,,(4),,,,[1],,.[J].,2008,221[2],.[J].,2006,352[3],.[M].:,2000[4].(GBJ25-90)[S].:,1991[5].(JGJ120-99)[S].:,1999[6],.[M].:,2002[7],,.[M].:,1994[8]∋(.()[M].:,1998SupportingStructureDesignofFoundationPitwiththeEquivalentBeamMethodZHULixia(EngineeringcollegeChinauniversityofGeosciences,Wuhan430074)AbstractAtpresent,theequivalentbeammethodisthemostpopularmethodwhichisusedtosupportthefoundationpit.Butforthepitmultibraced,therearefewconcretecalculationswiththismethod.TakingthefoundationpitoftheservicesbuildinginXiyangCountryofShanxiProvinceasanexample,thepileanchorsupportstructurewasadopted,andtheconcretecalculationtothemultibracedstructurewiththeequivalentbeammethodandthecontinuousbeammethodhavebeenconducted.Inaddition,thewholecalculatingprocesshasbeenanalyzed.Finally,theresultswhichcanbeusedtotherealprojecthavebeenachieved.Thewholeprocessshowsthedesigningprincipleclearlyandmakespeopleunderstoodeasily,soithasgreatapplicabilityandhighsecurity.Keywordsfoundationpit,theequivalentbeammethod,thepileanchorsupport,themultibracedstructure456: