Slope Stability — Factor of Safety

Ref: MS EN 1997-1, JKR Slope Stability Guidelines

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FOS = (c' + γ·z·cos²β·tanφ') / (γ·z·sinβ·cosβ)

Ref: MS EN 1997-1, JKR Slope Stability Guidelines

FOS = (c' + (γ−γw)·z·cos²β·tanφ') / (��·z·sinβ·cosβ)

Soil Properties

Effective Cohesion (c') (kPa)

From shear strength test

Friction Angle (φ') (°)

Effective friction angle

Soil Unit Weight (γ) (kN/m³)

Typical 16–20 kN/m³

Slope Geometry

Depth of Failure Surface (m)

Depth to potential slip plane

Slope Angle (β) (°)

Slope inclination from horizontal

Water Condition

Water table at failure surface

Driving Force

—kN/m\u00B2

Engineering aid only — final design must be endorsed by a registered PE under BEM.

Resisting Force

—kN/m\u00B2

Engineering aid only — final design must be endorsed by a registered PE under BEM.

Factor of Safety

—

Engineering aid only — final design must be endorsed by a registered PE under BEM.

Disclaimer: This output is an engineering calculation aid only and does not constitute a final or endorsed design. All designs submitted to Malaysian authorities must be endorsed by a registered Professional Engineer (PE) under the Board of Engineers Malaysia (BEM) in accordance with the Registration of Engineers Act 1967.