Stress Distribution & Bearing Capacity

Granular Soil
Granular Soil
(Based on Terzaghi’s calculation)

The stress distribution in front of a loaded anchor can be modelled using foundation theory. The ultimate performance of an anchor within the soil is defined by the load at which the stress concentration immediately in front of the anchor exceeds the bearing capacity of the soil.

Factors that will affect the ultimate performance of the anchor include:-

  • Shear angle of the soil
  • Size of the anchor
  • Depth of installation
  • Submerged Conditions

Platipus anchors perform exceptionally well in a granular soil, displaying short loadlock and extension characteristics, a broad frustum of soil immediately in front of the anchor and extremely high loads.

Stiff cohesive soils, such as boulder clays, can also give outstanding results. However, weaker cohesive soils, like soft alluvial clays, can result in long loadlock and extension distances and a small frustum of soil in front of the anchor. Consequently these conditions require a larger size of anchor and if possible a deeper driven depth to achieve design loads.

For further information please see the Anchor Selector (coming soon) section on our website.


Soft Cohesive Soil
Soft Cohesive Soil
(Based on Skempton’s calculation)


 

TYPICAL ANCHOR BEHAVIOUR

loadlockCompaction and LoadMaximum load rangeBearing capacity failure

LOADLOCK COMPACTION
AND LOAD
MAXIMUM LOAD RANGE BEARING CAPACITY FAILURE

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