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Anchor geometry
Penetration initiation
Failure wedge
Anchor settling

The penetration behaviour can be modelled by using simulation techniques in time domain.

The blocksceme of the model is given as:

 

As can be seen, the main contains four submodels:

Anchor geometry

In order to make a simulation program for the analysis of anchor penetration behavior, it is important to have a good model representing the anchor geometry.

Penetration

The goal of this sub model is to determine wheter the anchor will penetrate or if it fails.

Failure wedge
The goal of this sub model is to calculate the amount of soil of the failure wedge B, as shown in the free body diagram. Besides the amount of soil in the failure wedge the surface area at the outside of the failure wedge has to be calculated to calculate the friction of the soil along the fracture lines C, as shown in the free body diagram.

Settling

The goal of this sub model is to calculate which forces and accelerations are applied to the anchor when the blade is settling itself in the soil.

There are also several decision points. The first decision checks if the anchor is already'penetrating the soil or not. If it isn't, the submodel pentration will be runned.
If the anchor fails to penetrate, the model is quit.


After some calculations, the model checks if the anchor is breaking out during the calculated time step. If so, the model will be quit.

If the anchor is not accelarating anymore, there is force equilibrium and the anchor is in rest. Also in this situation, the model will be quit.

The last decision is made when the loop is completed. At that moment, the initial position values are overruled by the new calculated values.

 

Copyright © 2005 Project group 1
Last modified: 10/27/05