This work could advance vibration measurements for predicting the influence radius of vibratory pile driving. The centrifugal force can slightly increase the inside influence radius and the static force has little effect on the radius. The methods presented here will allow you to easily and quickly assign cell-by-cell boundary conditions to your groundwater models. The top side of the model is traction free, and the other sides are. The model has a height of 450 m and a width of 200 m to minimize any adverse boundary effects on the model results. Figure 1 and table 1 illustrates the geometry and the soil mechanical properties of the slope analyzed. a three-dimensional numerical model was developed using the explicit finite difference program FLAC3D as shown in Figure 10.
Flac3d boundary conditions free#
A free field boundary condition 2m2m mesh was used through the study to simulate the earthquake loading. Additionally, the inside influence radius is still bigger as two construction parameters (the centrifugal force and the static force) change. Defining boundary conditions is a very important step in the numerical modeling process, since this is how you can incorporate real world hydrogeologic features into your model. 2- Modelling with FLAC3D A silty sandy slope with a height of 20m and an inclination angle of 30° was created. Then, the PPV at all points are illustrated as an isoline map, where the inside vibration influence radius is larger than that of surface. When the distance from the pile axis is identical, the maximum PPV is inside the soil rather than at the ground surface. The surface PPV attenuation in simulation shows a good agreement with a field test. The computation time of the model is significantly decreased by a density scaling method. In this paper, a vibratory penetration model is established in FLAC3D to investigate both surface and inside PPVs.
The vibration influence radius of vibratory pile driving is commonly predicted by the peak particle velocity (PPV) at the ground surface rather than inside the soil. Boundary Conditions - zone gridpoint fix velocity-y range group Bottom not zone gridpoint fix velocity-z range group Bottom not.
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