How is uplift plate capacity calculated?

By breakout theory: shallow plates mobilize a failure surface to grade (capacity grows with depth), while deep plates fail locally (capacity plateaus). The breakout factor depends on soil type, relative depth and — in clay — whether suction is counted. PileCalc implements both regimes and the transition.

Does PileCalc design ground anchors?

It computes grouted-anchor adhesion capacity along the bond length and plate-anchor breakout; structural tendon design and stressing details are left to the structural side.

Can I use it for helical pile uplift?

The plate-breakout mechanics are the same ones used for individual helical bearing plates, so it is useful for spot checks — but for multi-helix piles, use the dedicated helical pile tool, which handles per-helix bearing, cylindrical shear and the AC358 torque correlation.

Das breakout theory · AllPile §8.4–8.5

Uplift plates and anchors: breakout done properly.

Shallow and deep breakout in sand and clay, the transition handled explicitly, plus grouted-anchor adhesion — with every factor visible.

Try it free

Uplift capacity of plates and anchors is governed by breakout: shallow anchors fail to the surface, deep anchors fail locally, and the transition depth matters. The module implements the standard sand and clay breakout treatments with the depth effect explicit.

Grouted anchors add adhesion capacity along the bond length. Combined with the axial module's uplift side resistance and the drilled-shaft belled-base uplift, the product covers the full range of tension elements.

Sand & clay breakout

Shallow and deep mechanisms with the transition depth handled explicitly, per Das and the AllPile treatment.

Grouted anchors

Bond-length adhesion capacity for tiebacks and soil anchors.

Suction / no-suction

Clay breakout with or without base suction, at your discretion.

Part of the whole

Pile uplift, belled-base uplift and plate breakout live in one consistent tool.

Validated against published benchmarks

Every figure below is produced by the engine on the cited published problem — closed-form solutions, design-manual tables, or independent codes — and reproduced by the test suite on every release.

Grouted-anchor bond capacity; plate breakout (AllPile §8.4–8.5)

Quantity	PileCalc	Reference	Agreement
Grouted-anchor ultimate pullout π·D·Lb·Ca (100 kN/m, 12 m)FHWA-IF-99-015 (Sabatini et al., 1999) bond model	1200 kN	1200 kN	exact

See the full per-tool validation report

The numbers, published

PileCalc's engine is checked term-by-term against the reference codes. A representative sample of the benchmarks — every intermediate value is visible in the app so you can reproduce them yourself.

Benchmark

Quantity

PileCalc

Reference

Agreement

Free-head pile (EI 1.43×10⁶, D 1 m, L 24.4 m)Liang et al. (2014) exact solution / RSPile

Max moment

792.2 kN·m

792.1 kN·m (exact)

within 0.1%

Fixed-head pile (EI 1.43×10⁶, D 1 m, L 24.4 m)Liang et al. (2014) exact solution / RSPile

Head moment

−581.1 kN·m

−581.0 kN·m (exact)

within 0.1%

Cantilever pile (EI 320, D 0.1 m, L 5.25 m)Liang et al. (2014) exact solution / RSPile

Head deflection

8.75 mm

8.750 mm (exact)

within 0.1%

Cantilever pile (EI 320, D 0.1 m, L 5.25 m)Liang et al. (2014) exact solution / RSPile

Max moment

2.335 kN·m

2.334 kN·m (exact)

within 0.1%

Circular pile, API sand (D 0.5 m, L 10 m, H 100 kN)RSPile verification manual

Deflection & moment profile

RSPile 2018 problems #1/#2/#8/#15

chart-reading tolerance

within 1–3%

Steel pile, multi-layer slope stabilization (17 m)RSPile / TZPile / LPile

Lateral resistance

607 kN

582 kN

within ~4%

Read how we validate — and why against two independent codes

Uplift & anchors: common questions

Go deeper

Run it on your next project

Free to start — no install, no dongle, every input explained and every result visible.

Launch the app