With PLAXIS 2D and PLAXIS 3D it is possible to regenerate any Staged construction setting to the definition of the previous phase. This feature is available for any item that is part of the Model explorer and to be set per phase. This includes e.g. the active state of soil and structures, the assigned materials and load values. Items that are not included in this feature are:
In order to regenerate all Staged construction settings, go to the model tree for the desired phase. In the model tree, right click Geometry. A pop-up menu will appear. Here, choose the option called Regenerate.
This will regenerate all items to the Staged construction definition of the phase this phase starts from. Also, all Staged construction settings in all phases following the current phase will be regenerated if the setting is not different from the current phase’s setting for the selected items.
In this PLAXIS 3D example, we will take a very simple model with two soil layers and two surface loads, see the image below.
For the initial phase, Soillayer A will be assigned material A and Soillayer B will be assigned material B. In phase 1, we will activate the two surface loads: the left will be set to σz = -50 kPa and the right surface load to σz = -50 kPa.Now we will add a new phase, Phase_2, in which we will keep the left surface load σz = -50 kPa, the right surface load will be changed to σz = -100 kPa, and the material for Soillayer B will be set to material C:
If we would now regenerate Phase_2’s model, by using the right mouse button on Geometry in the Model Explorer, we can regenerate the settings for Phase_2 to the setting of Phase_1:
The regenerate option is available for all staged construction settings. These are Model explorer items that are phase specific and that are on any level in the Model explorer. These settings are also in available the Selection explorer when selecting items.
You can easily regenerate the following items by right-clicking any of these model explorer items:
To continue the example above, we will do some different actions, all starting after the original definition of phase 2.
a) Only regenerate loadsNow we will only regenerate the values for the surface loads to the values of phase 1, without changing the soils in phase 2. To do so, we use the right mouse button on the Surface loads item in the Model Tree, and choose Regenerate. As a result, the material assignments will not be changed, but both the surface loads are now set to σz = 50 kPa:
b) Regenerate second soil layer in model viewFor this, we will use the right mouse button to click on the second soil layer in the 3D model view. From here we can also choose to Regenerate. As a result, phase 2 will now again have material B assigned to the second soil layer, while the loads are not changed.
c) Regenerate first soil layer in selection explorerIn this case, we will select the first soil layer with material A assigned by clicking on it. It will turn red and in the selection explorer you can see the selected soil material. The regeneration option will also work here. To do so, just go to the selection explorer and right-click on the soil object, and choose Regenerate. Of course, no change will be made in the model since both in Phase 1 and Phase 2 material A was already assigned to the first soil layer:
Regenerating water conditions is less straightforward and involves first a selection of the desired part of the model.To regenerate a single volume’s water condition, these steps should be taken:
When water conditions for multiple volumes need to be regenerated, a multi-select is required in order to perform this action in the selection explorer.If the entire phase’s water conditions need to be regenerated, the following steps are needed:
Please do not forget to check if the global water level needs to be regenerated in the Phases window as well.
This same approach to regenerate only specific parts can be used for e.g.
One of the features of the regeneration process is that it will regenerate all changes into the succeeding phases. This regeneration process will continue per individual property until it reaches the last phase, or when the property is not equal to the property value as it was defined as in the phase we are now regenerating.
As an example, we will use the same model as described above, and add a phase that has the same settings as in phase 2. After regeneration of the entire Geometry of phase 2, both phase 2 and phase 3 will have the same staged construction settings as phase 1:
If we now would have defined different load values in phase 3 compared to phase 2, then the result of regenerating the entire geometry in phase 2 will look like this:
The loads in phase 2 are regenerated to the load values as in phase 1, as well as the material assignments. In phase 3, we see that the material is also regenerated to the one as defined in phase 1, since it was the same for phase 2 and phase 3 prior to regeneration. The load values however were not the same as in phase 2, so these will not be changed in phase 3.
In the next example, we will take phase 1 as in the original case, but for this case in phase 2 we will change a load, and all material assignments. Then in phase 3, we will change another load, and change the material for the second layer again. We will regenerate the entire geometry in phase 2:
The following items will NOT be regenerated in Phase_3:
These items will be changed:
The regeneration option is a powerful tool to reset and regenerate features in phases to the values in the previous phase. It can also apply these changes into the following phases, as long as the values were the same as in the phase you are regenerating.