Foundations & Piles
Deep Foundation Axial Capacity (Driven Piles & Drilled Shafts)
Calculate ultimate, allowable and uplift axial capacity of driven piles (alpha, lambda and beta methods) and drilled shafts (O'Neill & Reese 1999 / FHWA GEC-10) in layered soil, with IGM layers, belled bases, exclusion zones and large-diameter base reduction.
Deep Foundation Axial Capacity (Driven Piles & Drilled Shafts)
Calculate ultimate, allowable and uplift axial capacity of driven piles (alpha, lambda and beta methods) and drilled shafts (O'Neill & Reese 1999 / FHWA GEC-10) in layered soil, with IGM layers, belled bases, exclusion zones and large-diameter base reduction.
Inputs
1. Foundation Geometry & Site Parameters
2. Soil Stratigraphy Layers
Soil types: Clay → enter su (undrained shear strength) | Sand → enter φ' (friction angle) | IGM (cohesive intermediate geomaterial / soft rock) → enter qu | Rock → enter qu, then set the socket parameters (side shear, joint factor and end-bearing method) in the row that appears below the layer
Results
Enter foundation dimensions and soil layers above, or click a Demo Preset to compute axial capacity.
Theory and formulae
O'Neill & Reese Formulation (FHWA GEC-10)
About this calculator
This free deep foundation capacity calculator runs entirely in your browser: what you enter is never uploaded. Switch between metric and imperial units at any time. Use the calculation steps and the theory section to check the working, and print a calculation sheet with the inputs, results and formulae for your records.
Methods and references: O'Neill & Reese (1999), FHWA GEC-10, API RP 2A, Tomlinson, AASHTO LRFD.
Topics: piles, axial pile capacity, driven pile, drilled shaft, bored pile, deep foundations, alpha method, beta method, lambda method, fhwa gec-10, o'neill reese, igm, belled shaft, skin friction, end bearing, uplift.
Engineering notice: Results are for preliminary estimation, screening and education. All inputs and outputs must be independently verified by a qualified professional engineer before use in any design or construction decision. Read the full disclaimer
Disclaimer
This calculation sheet was generated with Geotechnical Toolbox for preliminary estimation, screening, educational and verification purposes only. Geotechnical engineering involves site-specific ground conditions and uncertainty. All inputs, methods, results and figures must be independently checked and approved by a qualified Professional Engineer (P.Eng. / PE) before being relied on for design, construction or any safety-critical decision. Results reflect the values entered at the time of printing. The author and site accept no liability for errors, omissions or damages arising from their use.
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