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Add Pre-Load

The Pre-Load option allows you to define a polygonal load representing a fill material, where the load magnitude is defined by the Fill Height and the unit weight of the fill material. The Pre-Load option can be used in two different ways:

  • The primary purpose of the Pre-Load option is to use as a back analysis option, allowing you to determine the required fill height necessary to achieve a particular settlement at a given stage.
  • The Pre-Load option can also be used to directly define the fill height, without using the back analysis option.

A Pre-Load represents a uniform load (i.e. the fill height is assumed to be constant over the area of the pre-load).

Due to the requirements of the back-analysis computation, only a single Pre-Load can be defined.

To add a pre-load:

  1. Select Add Pre-Load Add Pre-Load icon from the toolbar or the Loads menu.
  2. In the Plan View, enter the vertices of the polygon as described in Entering Coordinates. To close the polygon boundary, after all vertices are entered, right-click and select Close, or you can type c and Enter in the prompt line.
  3. You will see the Define Pre-Load dialog:
    • Enter the Fill Unit Weight, Installation Stage and Removal Stage (if the pre-load is to be removed).
    • Back Analysis - to calculate a fill height for a required settlement, select the Calculate Height from Settlement checkbox (this is on by default). Enter the desired settlement value, the stage of the desired settlement, and a reference stage (if you want to enter relative settlement between two stages).
    • User-Defined Fill Height - to enter a user-defined Fill Height, turn off the Calculate Height from Settlement checkbox, and enter the Fill Height.
  4. When you are finished entering the information, select OK. The pre-load will be added to the model.
  5. A Point Query is automatically added at the center of the pre-load and results will be displayed. See below for details.

Pre-Load Results

When you add a pre-load, a Point Query is automatically created at the center of the pre-load.

This is the location at which the back-analysis computation is carried out. If the Calculate Height from Settlement checkbox was selected, the results of the back analysis (i.e. fill height for desired settlement) will be displayed in a text box beside the pre-load.

If the specified settlement cannot be achieved at the specified stage, for any value of fill height, the results will indicate Preload Height: Outside Limits. This may occur, for example, if the settlement you have entered has already occurred prior to the specified stage.

After computing a back-analysis, if you turn off the Calculate Height from Settlement checkbox, the computed fill height will automatically be entered as the Fill Height.

NOTE:

  • In the 3D View a pre-load is displayed using it's actual height (either the computed height from the back-analysis, or the user-defined height).
  • The display of the pre-load and results can be customized using the Display Properties for the pre-load.
  • For a tutorial illustrating the Pre-Load option, see the Settle3 Tutorials page.
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