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Add Tension Crack

A Tension Crack zone can be defined in Slide2 by adding a Tension Crack boundary, above which a tension crack zone will exist.

To add a Tension Crack boundary to your model:

  1. Select Add Tension Crack Tension Crack Icon from the toolbar or the Boundaries menu.
  2. Enter the vertices of the Tension Crack boundary as described in Entering Coordinates.
  3. When all vertices are entered, right-click and select Done, or press Enter with nothing in the prompt line.
  4. The region above the Tension Crack boundary, and within the External Boundary, will then be shaded with a vertical line pattern, to highlight the Tension Crack zone you have created (i.e. a Tension Crack boundary defines the lower limit of a Tension Crack zone).

NOTE: only ONE Tension Crack boundary can be defined for a model. After a Tension Crack is added, the Add Tension Crack option is disabled. If you want to add a completely new Tension Crack, then you must first delete the existing Tension Crack with the Delete Boundary option, and then add a new Tension Crack boundary.

Tips

  • By default, when a Tension Crack boundary is initially added to the model, the Tension Crack zone is defined as being 100% water filled (the worst case for stability). This can be changed at any time, using the Define Tension Crack option in the Properties menu. The Define Tension Crack option allows you to define the water level in the Tension Crack zone as dry, water-filled or partially water filled.
  • Unlike a Material Boundary, a Tension Crack boundary does not have to intersect the External Boundary in order to form a closed region, although in most cases it probably will.
  • The theoretical maximum tension crack depth can be estimated as described below.

Theoretical Maximum Tension Crack Depth (z)

For a given soil with Mohr-Coulomb strength parameters c and f , and unit weight , the theoretical maximum tension crack depth z can be estimated from the following equations:

Maximum Tension Crack Depth Equations

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