土壤力学土壤力学英文 (27).ppt

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1、Terzaghis Bearing Capacity TheoryMethods for determining bearing capacity of soiloPlate load testoTheoretical methodsoEmpirical methodsoPlate load testoPlate load testSettlement LoadoTheoretical methodsTerzaghis bearing capacity theoryAssumptions:1.The foundation is strip foundation (length-to-width

2、 ratio L/B=5).2.The base of the foundation is rough.3.The soil above the foundation base is simplified as uniform distributed load,q=DfTerzaghis bearing capacity theoryZone I:elastic zone ABJZone II:radial shear zones(AJE and BJD)Zone III:Rankine passive zones(AEG and BDF)WOriginal surfaceDfABJEGDFZ

3、one II Zone II Zone III Zone III Zone I 2bFree-body diagram of the wedge ABJW=weight of soil wedge ABJ=b2tanC=cohesive force acting along each face,C=cb/cosPp=the passive forces acting on AJ and BJ faces of the soil wedge.ABJ2bCPpPpWqu(1)c cohesion of soil internal friction angle of soilABJ2bCPpPpWqu(2)Terzaghis bearing capacity equationThe terms Nc,Nq,and N are called the bearing capacity factors.(3)(4)(5)Terzaghis bearing capacity equationContinuous or strip foundationSquare foundationCircular foundation(2)General bearing capacity equation