Xponexus Engineering

Earth Pressure

Active/passive earth pressures with Rankine or Coulomb options. DA1 Comb 1 & 2 (A1/M1 vs A2/M2). Includes surcharge and water table.

Geotechnical Engineering • #geotech Rankine / Coulomb DA1 Comb 1 & 2 Water + surcharge

Scope note: This tool reports resultants and base pressures. It does not check wall stability, sliding, overturning, bearing, or drainage details.

Geometry

Retained height H (m)

Backfill slope β (deg)

Wall friction δ (deg)

Method

Coulomb here is a simplified version; for complex geometry use robust methods/tools.

Soil (characteristic)

φ′k (deg)

c′k (kPa)

γ (kN/m³)

M2 γtanφ

M2 γc′

Water

Water table depth zw (m) below GL

γsat (kN/m³)

γw (kN/m³)

If zw within retained height, adds hydrostatic pressure + uses submerged γ’ below zw.

Surcharge

Uniform surcharge qk (kPa)

Action type

Line surcharge (kN/m) (optional)

Line surcharge treated as equivalent uniform q over height (screening).

Combination selection

Mode

Actions: Comb1 uses 1.35G + 1.5Q; Comb2 uses 1.0G + 1.3Q (typical UK NA sets).

Check Summary

Comb 1 active

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Comb 2 active

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Governing

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Outputs: Pa (kN/m), base σa(H) (kPa), and water resultant if applicable.

Detailed Report

Press “Run calculations”.