Free Anchored Excavation Analysis

Design the anchors & sheet piles for a retaining wall.

Uses the Net Available passive resistance method (Burland) & Eurocode 7. Calculate earth pressures for a retaining wall. Considers drained conditions & water at ground level.
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This analysis uses the Fixed earth approach to resolve the minimum pile toe level, the embedment is increased 20% to provide the fixed earth resultant force.
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Update soil profile
Excavation Design
Anchor depth m
Check that anchor depth is above excavation depth.
Anchor length m
Anchor length less than 8m.
Anchor 2 depth m
Check that anchor depth is above excavation depth.
Anchor 3 depth m
Check that anchor depth is above excavation depth.
Base depth m
Check that soil is deep enough, base cannot be deaper than toe, max depth of 30m.
Minimum pile toe depth m
Max depth of 30m & check that soil is deep enough.
Angle of anchor o
Advanced settings
Anchor grout details
Select an anchor specification to modify anchor properties.
Anchor grout strength MPa
Enter a number between 0 and 100.
Anchor grout pressure kPa
Enter a number between 0 and 2000.
Grout hole diameter mm
Enter a number greater than reinforcement diameter or 0.
Surcharge details
Include a surcharge alongside the wall
Surcharge kPa
Enter a number between 0 and 150.
Steel yield strength N/mm2
Youngs Modulus E GPa
Enter a number between 0 and 750.
Moment of inertia I cm4
Enter a number between 0 and 1000000.
Excavation reactions:
Char. applied load to anchor
Design applied load to anchor
Max passive soil reaction
Total anchor length m
Free anchor length m
Fixed anchor length m
Anchor analysis results:
These are the predicted forces acting on your excavation supports. Anchor capacities are estimated using the Bustamante & Doix (1985) method
Select an anchor specification & we will automatically generate calculations & results here.
Bending Moment Diagram
Shear Force Diagram
Wall Deflection Diagram
This analysis assumes that supporting stuts are rigid and do not act as springs. Stiffness of wall can be modified in advanced settings.
Sheet pile resultant forces:
These are the predicted effects on your sheet pile wall.
Max predicted Min predicted
Bending Moment
Shear force
Deflection*
*Wall properties (deflection): E = GPa I =cm4
Select a sheet piling size to automatically generate results here

How does this analysis work?

Calculation validation

Answer 1: 5.6m
Answer 2: 395kN

Contribute to this calculator

This calculator is open-source and you can contribute to it's development.
You can find the source code on GitHub here: PyAnchor
Special credits: Andrea Carigi

Edit Geology

Select dropdown estimates for geological properties from our geotechnical database or enter your own properties. Estimated properties are for feasibility study only.