Boundary conditions (x, y, xy or transmitting base) and Dynamic load (x, y or xy). All nodes of the mesh are initially free to move in both the X and Y direction is (default condition).
Fix X, Y or XY node
Transmitting Base node
The contact between the Soil and the BadRock can be modeled using a Base Transmitting node able to absorb some of the energy in arriving.
The contact between the Soil and the BadRock can be modeled using a Base Transmitting node able to absorb some of the energy in arriving.
The artificial reflections of incident waves are minimized in accordance with the procedure Lysmer and Kuhlemeyer, 1969 (manual Quad4m) using a viscous boundary absorbent (dashpots). The procedure adapts the forces in x and y direction as a function of speed of movement of the specific node:
When a transmitting base is used, the input motion is function of the dynamic properties (P or S wave and density) of the material in the half-space below the finite element model, the material properties and the geometry of the mesh. A transmitting base can be used when the input motion represents an outcrop accelerated, recorded at an outcrop of material half-space.
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