Foundations & Piles

Pile Group Efficiency & Settlement Calculator

Calculate pile group reduction efficiency (Converse-Labarre, Sayed-Baker), cohesive block failure capacity (Skempton), and 2:1 equivalent raft immediate & 1D consolidation settlement.

FHWA GEC-010TomlinsonAPI RP 2AAASHTO

Inputs

Demo

1. Pile Group Geometry & Layout

Rows (m)

Columns (n)

Diameter D (m)

Spacing s (m)

Pile Length L (m)

Load Transfer Mode

2. Single Pile Capacity & Applied Loads

Single Ult Cap Qu (kN)

Applied Group Load Qg (kN)

Shaft Adhesion cu (kPa)

Base Shear cub (kPa)

3. Compressibility & Settlement Parameters

Soil Modulus Es (MPa)

Poisson's Ratio nu

Compression Index Cc

Recompression Cr

Initial Void Ratio e0

Clay Thickness Hc (m)

Preconsolidation σ'p (kPa)

Overburden σ'v0, mid-clay (kPa)

Theory and formulae

Theory & Formulae

About this calculator

This free pile group efficiency 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: FHWA GEC-010, Tomlinson, API RP 2A, AASHTO.

Topics: pile group, group efficiency, converse-labarre, sayed-baker, block failure, equivalent raft, group settlement, consolidation, 2:1 method.

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