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1、东财《土力学与地基基础》在线作业一（Easternmoneysoilmechanicsandfoundationonlinehomework）Thecorrectanswer:C4.ofsaturatedundisturbedsoilsampleswereconsolidatedundrainedtest,failuremeasured3sigma=200kPa,sigma1-sigma2=400kPa,theporewaterpressureofu=100kPa,theanglebetweenthesamplerupturesurfaceandthehorizo
2、ntalplaneis58degrees,andtheeffectivestressintensityindexC'.()A.C'=66.2kpaB.C'=72.2kpaC.C'=76.2kpaD.C'=78.2kpaThecorrectanswer:C5.thesensitivityofacohesivesoilisSt=1.5,andthesoilcanbedetermined.A.lowsensitivesoilSensitivesoilinB.C.highsensitivesoilD.verysensitivesoilThecorrectanswer:A5
3、.thecontinuouswallisnotonlytheconstructionofundergroundworks,butalsothepermanentbuilding.A.undergroundpart,undergroundpartB.enclosure,undergroundpartC.undergroundpart,enclosurestructureD.enclosurestructureThecorrectanswer:B5.aconstructionsitetofill,excavationvolumeis2000m3,isthesource
4、ofearthworkexcavation,fromanearbymoundbysoilsurvey,theproportionof2.70,15%moisturecontent,voidratiois0.60,waterfillingrequirements17%,drydensityis17.6KN/m3,asksoilfieldsoilgravity,dryandseveresaturationishowmuch?()A.P=16.875(KN/m3),Pd=19.406(KN/m3),Sr=67.5%B.P=26.875(KN/m3),Pd=20.406(
5、KN/m3),Sr=57.5%C.P=16.475(KN/m3),Pd=18.406(KN/m3),Sr=63.5Thecorrectanswer:A6.theparticlesizecanbedeterminedbysievingmethodnotlessthan()A.0.075mmcoarse-grainedgroupB.0.25mmcoarse-grainedgroupC.0.5mmcoarse-grainedgroupD.2mmcoarse-grainedgroupThecorrectanswer:A6.pilecapofprecastpilesecti
6、onunderthelengthof12.5mis350mm*350mm,asiltwearthicknessofL1=5m(withremoldedsamplesmeasuredCu=16kPa),thelengthofL2=7.5mintohardclay,calculationofbearingcapacityofsinglepilefromhardclayCu=130kPa.(safetyfactorK=2)A.1210.8kNB.1290.8kNC.2210.8kND.605kNThecorrectanswer:D6.,whentheupperparto
7、fthefoundationisweakandthelowerpartisnotdeepenoughtoburyasolidstratum,itisbettertoadopt().A.pilefoundationB.caissonC.diaphragmwallD.stripfoundationThecorrectanswer:A7.inaheadpenetrationtest,thesampleareaisA=2000mm2,thesamplelengthisL=80mm,andthewaterheaddifferenceish=60mm.Thewaterflow
8、throu
