PLAXIS LIQUEFACTION MODEL UBC3D-PLM - Knowledge Base

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1.2Excess Pore Pressures\nitial Vertical Effective Stress1.00.80.60.4Experiment0.2UBC3D-PLM0.00 1 2 3 4 5 6Num ber of CyclesFigure 2.10: Validation of the UBC3D-PLM for cyclic loading. Undrainedbehaviour of Fraser sand (RD = 40%) under cyclic simple shear. Influenceof K 0 . Stress path in Test 3 with CSR = 0.12. K 0 = 0.5.Figure 2.11: Over-produce of hysteretic damping of the UBC3D-PLM constitutivemodel. The elastic unloading with G max leads to over-produceddamping.32
Chapter 3Validation of theUBC3D-PLM in a finiteelement scheme3.1 Modelling of a dynamic centrifugeIn this chapter the validation of the UBC3D-PLM in a finite element schemeusing PLAXIS 2D is presented. A dynamic centrifuge is modelled. Theparameters for the numerical model as well as the experimental results forthe comparison are reported by Byrne et al. (2004).The main objective in this numerical calculation is to test the abilityof the proposed model to capture the onset of liquefaction and judge theaccuracy of the results in terms of the evolution of excess pore pressuresduring dynamic loading. The predicted soil behaviour is compared withmeasurements taken during the physical modelling.A systematization of the centrifuge test is presented in Figure 3.1. Themagnitude of the acceleration applied to the centrifuge equals 120 g (g is thegravitational acceleration) in order to scale the stresses during the physicalmodelling. The input motion for the dynamic loading is 50 cycles of applied33
Page 1: PLAXIS LIQUEFACTION MODELUBC3D-PLMA
Page 5 and 6: 3.6 Reproduced stress path in p ′
Page 7 and 8: AbstractIn this report the formulat
Page 9 and 10: Comparing with the previous version
Page 11 and 12: Figure 1.2: Projection of the yield
Page 13 and 14: ( ) mepK = KBP e A (1.9)P ref( ) ne
Page 15 and 16: The plastic potential function is f
Page 17 and 18: the secondary loading in order to e
Page 19 and 20: loading surface is used again. A ne
Page 21 and 22: The drained bulk modulus of the soi
Page 23 and 24: modelling the inherent and induced
Page 25 and 26: Table 1.1: Input Parameters for the
Page 27 and 28: whereas the P P RMAX can reveal if
Page 29 and 30: Chapter 2Validation of the UBC3D in
Page 31 and 32: Pore Pressure, u (kPa)UBC3DEx.Pore.
Page 33 and 34: first cycle of post-liquefaction be
Page 35 and 36: Shear Stress , τ (kPa)1086420-2-4-
Page 37: 1.2Excess Pore Pressures\nitial Ver
Page 41 and 42: Figure 3.2: The finite element mesh
Page 43 and 44: checked but the results are not fur
Page 45 and 46: used again when the stress path exc
Page 47 and 48: EPP (kPa)EPP (kPa)EPP (kPa)Measurem
Page 49 and 50: Figure 3.8: Reproduced stress path
Page 51: S.S. Park and P.M. Byrne. Practical

PLAXIS LIQUEFACTION MODEL UBC3D-PLM - Knowledge Base

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