Slope Stability Factor of Safety Calculator

Calculate factor of safety for infinite and finite slopes. Infinite slope: FOS = (c + σ·tanφ)/(Hγsinβcosβ). Bishop simplified method for circular slip surfaces. Minimum FOS = 1.5 for new slopes, 1.3 for existing.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
Advertisement

How to Use

Enter the values for the patient or scenario you are assessing. Calculate factor of safety for infinite and finite slopes. Infinite slope: FOS = (c + σ·tanφ)/(Hγsinβcosβ). Bishop simplified method for circular slip surfaces. Minimum FOS = 1.5 for new slopes, 1.3 for existing. Use the slope stability result to inform your clinical assessment.

Related Calculators

Active Earth Pressure

Engineering

Soil Bearing Capacity

Engineering

Consolidation

Engineering

Frequently Asked Questions