About The Infinite Slope Stability Calculator

The Infinite Slope Stability Calculator estimates factor of safety for a shallow infinite-slope condition using soil unit weight, failure depth, slope angle, friction angle, cohesion, and pore pressure ratio.

How to Use the Infinite Slope Stability Calculator Online

1. Enter the required inputs in the fields above using the units shown on the labels.
2. Select any mode, shape, or method options so the calculation matches your scenario.
3. Run the calculation and review the result summary in the output panel.
4. Check the units, assumptions, and project requirements before using the result outside preliminary review.

Choosing Options Correctly

Angles are entered in degrees, unit weight in kN/m^3, depth in meters, cohesion in kPa, and ru as a decimal pore pressure ratio below 1.

Common Use Cases

• Screen shallow translational slope stability conditions.
• Compare the influence of cohesion, friction angle, and pore pressure.
• Check sensitivity before detailed geotechnical slope modeling.

Quick FAQ

What slope case does this represent?
It represents a simplified infinite slope condition, usually for shallow translational stability checks.

Does it handle circular slip surfaces?
No. Circular, wedge, and complex failures need a different slope stability method.

Why does water matter?
Pore pressure reduces effective stress and can strongly reduce factor of safety.

Can this replace geotechnical design?
No. Use it only for screening and verify with site-specific soil data and a qualified analysis.