spt1

SPT Bearing Capacity Calculator (IS:2131)

Computes SPT N-value and bearing capacity parameters with IS:2131 corrections.

Depth at test (m)

Ground water level from ground (m) — leave blank if dry

Unit weight of soil (kN/m³)

Blows — 1st 15 cm (seating drive)

Blows — 2nd 15 cm

Blows — 3rd 15 cm

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Select Overburden correction method IS:2131 (approx via Pa/σ') Liao & Whitman (1986) Skempton (1986)

Atmospheric reference pressure Pa (kPa)

Energy ratio (ER) in %

Factor of Safety

References: IS:2131 (1981); IS:6403 (1981) for bearing capacity factors and corrections.