Active Earth Pressure Calculator

Calculate active earth pressure per Rankine: Ka = tan²(45-φ/2). Total force P_a = KaγH²/2 acting at H/3 from base. At-rest pressure Ko = 1-sinφ. Surcharge effects on lateral pressure distribution.

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.
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How It Works

Calculate active earth pressure per Rankine: Ka = tan²(45-φ/2). Total force P_a = KaγH²/2 acting at H/3 from base. At-rest pressure Ko = 1-sinφ. Surcharge effects on lateral pressure distribution

Each component has a specific meaning:

  • Base — The base recorded for the patient or scenario being assessed.

Note: Interpret the active earth pressure result against the clinical thresholds and context described above.

How to Use

Enter the base for the patient or scenario you are assessing. Calculate active earth pressure per Rankine: Ka = tan²(45-φ/2). Total force P_a = KaγH²/2 acting at H/3 from base. At-rest pressure Ko = 1-sinφ. Surcharge effects on lateral pressure distribution. Use the active earth pressure result to inform your clinical assessment.

Frequently Asked Questions