Vibroflotation & Stone Column Design Calculator – Ground Improvement Settlement Reduction

Vibroflotation & Stone Column Design Calculator

Ground improvement • Area replacement ratio • Settlement reduction • Spacing & diameter • Improvement factor

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📐 1. Stone Columns & Vibroflotation – Ground Improvement

Stone columns (vibroflotation) are used to improve soft soils, reduce settlement, and increase bearing capacity. Key design parameters:

Key equations: a_s = (D_c²) / (S_e²) for square pattern; n = 1 + a_s(E_c/E_s - 1); β = 1 / n (simplified).

Column diameter D_c (m)

Column spacing (m) – center to center

Pattern type

Soil Young's modulus E_s (MPa)

Stone column modulus E_c (MPa) – typical 40–80 MPa

Load intensity q (kPa)

Batch CSV (Dc, spacing, Es, Ec)

Get PDF Report via Email

CSV Template

Enter stone column diameter and spacing (center‑to‑center).
Select grid pattern (square or triangular).
Provide soil modulus (E_s) and stone column modulus (E_c).
Optionally enter applied load to estimate settlement.
Click "Design Columns" – area replacement ratio, improvement factor, settlement reduction, and composite modulus are displayed.
2D schematic shows column layout (top view and section).
Batch CSV: upload multiple designs for comparison.
PDF report includes all inputs, results, and sketch.

❓ What is a typical area replacement ratio?

For soft clays, a_s = 0.10–0.20; for loose sands, 0.15–0.30. Higher ratios increase cost and improvement.

❓ How does triangular pattern compare to square?

Triangular pattern gives higher area replacement for the same spacing, thus better improvement. The tool accounts for this.

❓ What is the stone column modulus?

E_c depends on stone type and confinement. Typical values: 40–60 MPa for crushed stone, 60–80 MPa for well‑graded gravel.

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