How is factor of safety against sliding calculated?

FS_sliding = (ΣV × tanδ + c_b × B + Pp) / ΣH, where ΣV is total vertical load (kN/m), δ is base-soil friction angle (typically 2/3 φ), c_b is base cohesion (kPa), B is base width (m), Pp is passive resistance (kN/m), and ΣH is total horizontal force including active pressure and surcharge. Minimum FS = 1.5 per ACI 318R and AASHTO LRFD.

How can sliding resistance be increased?

A shear key below the footing mobilises passive resistance from the underlying soil, significantly increasing FS. Alternative methods include increasing base width, batter the wall face, use a deadman anchor, or install soil nails. The key depth should not exceed the zone of seasonal volume change per NAVFAC DM 7.2.

Retaining Wall Sliding Check

Check factor of safety against sliding for gravity and cantilever retaining walls under active earth pressure, surcharge, and water pressure loads per ACI 318 and ASCE 7.

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.

How to Use

Enter the values for the patient or scenario you are assessing. Check factor of safety against sliding for gravity and cantilever retaining walls under active earth pressure, surcharge, and water pressure loads per ACI 318 and ASCE 7. Use the retaining wall sliding result to inform your clinical assessment.

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Frequently Asked Questions

How is factor of safety against sliding calculated?

How can sliding resistance be increased?