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GEO5

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Deadman

The "Deadman" is selected as an "Anchor type" in the combo list in the dialog window "New anchor".

The deadman anchor requires input of:

  • Location of anchor - depth, length, spacing
  • Stiffness of anchor - anchor diameter ds or area of anchor A, elasticity modulus E
  • Parameters for verification of anchor (Strength of anchor, Pull-out resistance from soil is decribed below)

Deadman parameters input

Deadman analysis

The deadman consists of a bar with specified length and anchoring element.

The pull out resistance from soil is equal to the passive resistance to the depth z, which is reduced by coefficient k:

For h = 0:

For h ≥ b - bD:

where:

h

-

height of the overburden over the anchor element

bD

-

width of anchor element

b

-

spacing between anchor elements

The coefficient k is interpolated for the intermediante values of h.

Calculation of the overburden over the anchor element:

where:

z

-

depth of deadman

hD

-

height of anchor element

The minimum length of the bar is computed as

kde:

φ

-

angle of internal friction

h

-

height of shoring structure

In the case that the length of bar l is shorter then minimum length of bar lmin, the dead man pull our resistance from soil is zero in the analysis.

The principle of determining the minimum length for deadman´s bar