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Settle3 FAQs

Below you will find answers to some Frequently Asked Questions (FAQs) for Settle3. If you cannot find an answer to your question or problem after reading the FAQs:

  1. Try the Search feature on this Help system.
  2. Contact Rocscience technical support at support@rocscience.com.

FAQs

  1. Can the program model non-horizontal soil layers?

    Although Settle3 does not allow for explicit 3-dimensional modeling of non-horizontal soil layers, it is possible to analyze variable soil profiles, if the analysis is limited to a single point query, and you are using the Boussinesq stress computation method. In this case, you simply have to modify the soil profile in the Soil Layers dialog, for each point query location, and re-run the analysis.
    For full 3-dimensional analysis, Settle3 version 2.0 can only model soil layers which are horizontal and continuous. It is expected that future versions of the program will allow non-horizontal soil layers and more generalized soil geometry.
  2. Is it possible to model loads with a rigid foundation?

    Settle3 version 2.0 allows you to model loads with a rigid foundation. However, it is not possible to use rigid loads with time dependent consolidation. Only elastic settlement or long term consolidation can be modeled with rigid loading.

  3. How does Settle3 handle rebound / heave during unloading when immediate settlement is not used?

    With respect to rebound for a non-linear material, when unloading occurs, strain is calculated using Cr instead of Cc. Cr is generally less than Cc so you will get less displacement during unloading than you would for loading. The same is true for the secondary consolidation. When unloading, Car is used instead of Ca.

  4. Poisson's ratio does not seem to affect the analysis results, why?

    Poisson's ratio is only applicable if you are using mean 3D stress, multiple layer or Westergaard stress computation, or rigid loading. See the Soil Properties topic for more information.
  5. Different staging factor for soil materials does not seem to change the results for constant load in different stages for immediate settlement. Why?

    Settlement is calculated based on the change in the stresses. If the load is constant throughout the stages, the immediate settlement at the staged loading will compute the settlement and this will be the settlement shown in the other stages as well. If you are interested in seeing different settlement with the staged factor for immediate settlement, we can recommend you to remove the load and re-apply a load in different stages to see the staged factor results.

  6. How does Settle3 compute pore pressure when material is excavated below the water table?

    When an excavation is added that extends below the water table, the water table is locally dropped to the bottom of the excavation. This is to ensure that the excavation is dry and not full of water. Query points inside the excavation will see a drop in pore water pressure. Query points outside of the excavation are unaffected by the drop in the water table.
    This approach tends to overestimate the settlement (it gives a conservative answer), compared with what would be observed for a true three-dimensional groundwater analysis, since this approach does not account for horizontal water flow from areas of higher pressure (outside of the excavation) to areas of lower pressure (under the excavation).

  7. How does a time point query work for staged loading?

    A Time Point Query only computes the time based on the current load state, at the time point stage. If the load changes after the time point stage (i.e. if loads are added or removed) the time point is not aware of the change in load state after the time point stage. Therefore if you have staged loading, you must add the time point at the final loading stage that you wish to consider.

  8. When should I consider immediate settlement?

    Click here for an article which discusses when to use immediate settlement, primary consolidation or both.

  9. My program crashes when I open the file. What should I do?

    Sometimes when Settle3 file is simultaneously edited in network shared drive, this may corrupt the results which causes Settle3 file to close upon opening. Try to first check whether the extension of the Settle3 file is .s3z or .s3d. If the latter, copy the .s3d file somewhere to an empty folder and attempt to open it. If .s3z, rename it to .zip first, then extract the contents, then move/copy .s3d to another empty folder and try to open it.
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