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End Truncation Plane

To add a Truncation Plane at either ends of the tunnel:

  1. Select: Boundaries > End Truncation Plane End Truncation Plane.
  2. The End Truncation Plane dialog will appear.
    End Truncation Plane Dialog
  3. Apply Near End Truncation and/or Far End Truncation.
  4. Specify the Plane Offset Distance(s).
  5. Select OK .

The End Truncation Plane is parallel to the tunnel opening, and at some distance offset from the tunnel end. In the 3D Wedge View, the End Truncation Plane(s) are visible in the Top, Side, and Perspective panes.

NOTE: The tunnel Opening Section must be defined prior to adding End Truncation Plane(s).

Truncation Plane Definition

The End Truncation Plane in UnWedge acts as a boundary for End Wedges. Any End Wedge extending beyond the Truncation Plane will be truncated.

NOTE: Similar to the perimeter Truncation Surface, bolts are allowed to penetrate through a Truncation Plane.

Effects of Truncation on Wedge Geometry

An End Wedge truncated by the Truncation Plane is no longer tetrahedral in shape. Wedge volume, weight, length, apex height, apex angle, joint area, joint trace length, and joint persistence are affected.

Effects of Truncation on Supports and Other Forces

Bolt/Joint intersections may occur either on a joint face or a truncation face on the wedge.

NOTE: For any bolts passing through the truncation face of a wedge, support Failure Mode by Shear will not be considered .

The truncation face(s) of a wedge are not considered as joints. No shear strength, water pressure, or field stresses are applied to these faces.

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