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
Book A free web presentation:
