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Helical Pile Design Verification - Square Solid Pile Section

Updated: Dec 28, 2023

SS175 (1.75 in size Square Solid Section) with 8''-10''-12'' Helixes


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

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Table 2: Stratigraphy (Boreholes)

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Table 3: Helical pile properties

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Soil Properties and Model in HelixPile


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Pile Section Properties and Helix Configuration


B. Ultimate bearing capacity calculations – Individual plate method


B1. Manual calculations


Effective soil stress:


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The general bearing capacity equation is:


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Calculations for each plate and for the tip:


Plate 3


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Plate 2


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Plate 1


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Tip


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Table 4: Bearing capacity for each plate/method


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B2. Verification using HelixPile Software


The following Figure presents the software calculated Capacities with each method:


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Figure: The plate results on the screen – Vesic - Meyerhoff/Hansen method respectively.


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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