Xponexus Engineering

Settlement Estimation

SLS settlement estimator: immediate elastic, Schmertmann (sand) option, 1D consolidation with OCR/Cr, plus secondary compression (creep).

Geotechnical Engineering • #geotech SLS (γ≈1.0) Immediate + Consolidation

Scope note: Settlement depends strongly on ground model, stiffness selection, drainage paths, OCR and construction sequence. Use this for prelim sizing/checks.

Footing & service pressure

Foundation type

B (m)

L (m)

Net service pressure q (kPa)

Embedment Df (m)

Use net SLS contact pressure (after overburden removal if appropriate).

Immediate settlement option

Immediate method

Es (MPa) (elastic)

Influence Is

Es at base (MPa) (Schm.)

Es gradient kE (MPa/m)

Schmertmann is approximated via a simple influence depth 2B and average Es over the zone.

Consolidation (1D)

Clay thickness H (m)

Drainage

σ'0 at mid-layer (kPa)

Δσ' at mid-layer (kPa)

OCR

Secondary compression (creep)

Cα

t1 (years)

t2 (years)

s_sec ≈ (Cα/(1+e0))·H·log10(t2/t1).

Time to consolidation (optional)

cv (m²/yr)

Target U (%)

t ≈ Tv·Hdr²/cv (Tv approximated). Use lab/field calibrated cv for serious timing.

Serviceability limits

Total settlement limit (mm)

Immediate limit (mm)

Differential limit (mm) (info)

These are project-dependent. Keep editable.

Check Summary

Immediate

—

Consolidation

—

Total

—

Note: Differential settlement requires stiffness model / footing interaction; here it’s informational only.

Detailed Report

Press “Run calculations”.