Retaining Wall Calculator

Rankine active earth pressure with overturning and sliding stability checks for a gravity/cantilever retaining wall.

Wall geometry and soil properties

Wall Height, H (m)

Soil Unit Weight, γ (kN/m³)

Soil Friction Angle, φ (degrees)

Surcharge Load, q (kPa)

Base Width, B (m)

Total Resisting Weight, W (kN/m)

Wall + soil wedge weight per metre run, acting at B/2

Base–Soil Friction Coefficient, μ

Earth pressure and stability factors of safety

Active Pressure Coefficient, Ka

0.000

Active Force, Pa

0.00 kN/m

Surcharge Force, Ps

0.00 kN/m

Total Overturning Moment

0.00 kN·m/m

Total Resisting Moment

0.00 kN·m/m

Factor of Safety — Overturning

0.00 (min. 1.5–2.0)

Factor of Safety — Sliding

0.00 (min. 1.5)

Rankine active earth pressure theory (per metre run of wall)

Ka: Ka = (1−sinφ)/(1+sinφ)

Pa: Pa = ½·Ka·γ·H²

Ps: Ps = Ka·q·H

Overturning: ΣMo = Pa·(H/3) + Ps·(H/2)

Resisting: ΣMr = W·(B/2)

FS (overturn): FS = ΣMr / ΣMo ≥ 1.5–2.0

FS (sliding): FS = μ·W / (Pa+Ps) ≥ 1.5