Pile Foundations

Driven H-Pile Capacity — α–β Method

Geometry & Groundwater

Perimeter P (m):

Base area A_b (m²):

Water table depth (m):

Toe depth:

For H-305×305×223, P ≈ 1.22 m; A_b ≈ 0.02841 m².

Stratigraphy & Parameters

Type

L (m)

γ (kN/m³)

c_u (kPa)

φ′ (deg)

Use α and c_u for clays; β for sands/saprolites. Provide γ for each layer. φ′ is optional (only used if computing N_q from φ′ for a sandy toe).

Base Resistance

Base type:

N_c (if clay):

c_u at toe (kPa, if clay):

N_q input (if sand):

φ′ at toe (deg, φ-route):

N_q (manual):

If sand is selected and φ′ is supplied: \( N_q = e^{\pi \tan\varphi}\tan^2\left(45^\circ+\frac{\varphi}{2}\right) \).
If clay is selected: \( R_b = N_c\,c_u\,A_b \).