Problem description

When doing a safety analysis, the option Ignore Undrained Behaviour can be switched on or off.
However, in 3D2011.00 this option cannot be deactivated via the phase settings window for a safety analysis: although the option might look deactivated, the user will notice that the ignore undrained behaviour will automatically be reactivated once the phase settings window is reopened. This activated Ignore Undrained Behaviour will be used for the corresponding safety phase’s calculation.

Solution

In order to make sure that the correct Ignore undrained behaviour setting is being used for a given safety analysis, please use the command line in order to

1. check this setting if it is really deactivated
2. change the calculation setting for ignoring the undrained behaviour.

1) Check the Ignore undrained behaviour settings
To check if the ignore undrained behaviour is activated (true) or deactivated (false) for e.g. phase_2, please use this command:

 echo phase_2.IgnoreUndrainedBehaviour

When the ignore undrained behaviour is activated, the following answer should be given:

 Phase_2.IgnoreUndrainedBehaviour: True

When the ignore undrained behaviour is activated, the following answer should be given::

 Phase_2.IgnoreUndrainedBehaviour: False

2) Change the Ignore undrained behaviour settings
In order to activate the IngnoreUndrainedBehaviour, please use this command:

 set phase_2.IgnoreUndrainedBehaviour true

And in order to deactivate it, the following command can be used:

 set phase_2.IgnoreUndrainedBehaviour false

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This is fixed since PLAXIS 3D 2011.01