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Helical Pile Design Verification - Pipe - Individual Plate Method

8in Diameter Circular Shaft with 14''-16''-18'' HelixesIndividual Plate Method


A. Project description


This example presents a detailed example for calculating the ultimate axial capacity of a helical pile according to Vesic 1974 and Meyerhoff/Hansen method. Table 1 below presents assumed soil properties, Table 2 summarizes the soil stratigraphy, while Table 3 describes assumed helical pile properties.


Table 1: Soil properties



Table 2: Stratigraphy (Boreholes)


Table 3: Helical pile properties


Soil Properties and Model in HelixPile


Pile Section Properties and Helix Configuration


B. Ultimate bearing capacity calculations – Individual plate method


B1. Manual calculations


The general bearing capacity equation is:




All helical piles are below water elevation, so γ = 120 - 57.6 = 62.4 pcf


Calculations for each plate and for the tip:


Plate 3




Plate 2



Plate 1



Tip



Table 4: Bearing capacity for each plate/method



B2. Verification using HelixPile Software


The following Figures present the software calculated Capacities with each method:


Figure: The plate results in HelixPile – Vesic method.


Figure: The plate results in HelixPile – Meyerhoff/Hansen method.


The following table summarizes the hand calculations and the software calculated capacities with all methods:


Table 5: Individual Plate Method - Results Comparison


 

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