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 ( , Pull-out resistance from soil is decribed below)
Deadman parameters input
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:
height of the overburden over the anchor element
width of anchor element
spacing between anchor elements
The coefficient k is interpolated for the intermediante values of h.
Calculation of the overburden over the anchor element:
depth of deadman
height of anchor element
The minimum length of the bar is computed as
angle of internal friction
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