ratio 1.08 1.0 0.97 Assign constitutive model and properties zone cmodel assign mohr-coulomb zone property bulk 2.e8 shear 1.e8 cohesion 1.e5 zone property friction 0. 894 ¸ W.LiandC.Zhang Table 1:Geologicparameters Layer Type UnitWeight(kN/m3) Es (MPa) Cohesion (kPa) Friction angle () Poisson ratiov 1 Siltyclay 20.0 7.2 45 17 0. 2D rough strip footing on Tresca material (Prandtl's wedge problem) -associated plastic flow- model new Create zones zone create brick size 6 1 20 point 1 ( 3.0, 0.0, 0.0 ). For finer grids, the indeterminacy in footing width decreases, and the match to the exact solution improves. In deriving, it is assumed that the jump occurs half a zone width from the end of the controlled boundary segment ( = 0.5 in Figure 2) note that if a variation factor of = 0.63 is assumed, the error reduces to less than 0.1%. The apparent position of the velocity jump within that zone depends on the exact geometry of the velocity field that develops. In a numerical simulation, this singularity is spread over the width of one zone. The mechanism illustrated in Figure 1 implies a velocity singularity at the ends of the footing. Note that the error in the bearing capacity is related to the indeterminacy in the apparent width of the footing. This tutorial problem presents a trench excavated in a soil with low cohesion.
The apparent width of the footing is taken to be 3 m, plus half the zone width adjacent to the footing edge (because forces are exerted on the footing by this zone, it is assumed that the forces are divided equally between left and right gridpoints). The structure of this tutorial, delineated below, corresponds to the general structure for FLAC3D modeling that is presented at length in the sections of the Problem Solving with FLAC3D section and is charted in General Solution Procedure Illustrated.
The numerical value of the bearing capacity,, is 523.0 kPa, and the relative error is 1.72% when compared to the analytical value of 514.2 kPa. I will appreciate the one who can provide help. At present, I finish the static simulation, but still a green hand in dynamic simulation part. The load-displacement curve corresponding to the numerical simulation is presented in Figure 5, in which load is the normalized average footing pressure,, and disp is the magnitude of the normalized vertical displacement,, at the center of the footing. And also will use the FLAC3d to simulate the testing. Figure 4: FLAC3D grid-vertical plane view.