Failure Phenomenon Simulation by MPS-DEM Geotechnical Structure Elastic behavior: MPS Failure: DEM Strength Parameters Tensile Strength for failure ijn ct Maximum Shear Strength (not failure) max cij ijn tan ij Shear Stress Coh_lij cij cij Tensile ct ct ij ij Initial 1st parameter New contact 2nd parameter Compression Normal Stress ijn 2 Compression Test Homogenous Compressive Condition Step-1 Confining Stress 1: x-stress, 2: x-stress 3: y-stress, 4: y-fix y Confining Stress x 20m constant x-stress constant y-stress enforced y-displacement, x-fix x,y fix 3 2 4 1: 2: 3: 4: 25 kN/m2 3 1 Step-2 Compression 1 2 4 10m 3 Compression Test Type-2 formulation magnification ratio 5.0 • Failed particles appear on conjugate 45 degree line regularly • Nonlinearity can not be observed in strain-stress relation, etc., It is known that the regular gird (lattice) alignment affect the failure behavior Number of disconnected particles 0, 1, 2, 3, 4 more than 5 Macro Strain and Stress Strain=disp. at top/length Stress=force at top/wedth JUMP 4 magnification ratio 5.0 Compression Test Random Model 1 Jump Number of disconnected particle 0, 1, 2, more than 3 Seed of random number 111113 5 magnification ratio 5.0 Compression Test Random Model 2 Number of disconnected particle 0, 1, 2, more than 3 Seed of random number 111112 6 6 Compression Test Comparison of lattice model and random model 7 Case 1 Big Model Confining Pressure=50 1.5-3.0 seconds Deviatonic Stress Output Memo Axial Strain Interaction condition Acceleration (H) Interaction Blue :initial, orange:weak Red: Dem, green:mps 2.0秒間ではev2がメモリ不足 Uper, lower layer=0.4m, Seed of random number=1111112 8
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