🌍 Liquefaction Potential Calculator

Assess soil liquefaction potential during seismic events

Typical range: 4.0 – 9.0
Typical range: 0.01g – 2.0g
Distance from ground surface to water table
Percentage of particles smaller than 0.075mm
Blow count from SPT (1-100)
Depth from ground surface to layer midpoint
Vertical effective stress at layer depth

Liquefaction Potential Results

Factor of Safety (FS): –
Liquefaction Potential: –
Cyclic Stress Ratio (CSR): –
Cyclic Resistance Ratio (CRR): –
Liquefaction Risk
0%
Low High

Interpretation

Enter your parameters and click “Calculate” to assess liquefaction potential.

Calculation Methodology

This calculator uses the simplified procedure based on Seed and Idriss (1971) for evaluating liquefaction potential. The Factor of Safety (FS) against liquefaction is calculated as the ratio of Cyclic Resistance Ratio (CRR) to Cyclic Stress Ratio (CSR).

The Cyclic Stress Ratio (CSR) is adjusted for magnitude scaling factors and overburden correction factors. The Cyclic Resistance Ratio (CRR) is determined from corrected SPT N-values considering fines content and overburden pressure.

Technical References

  • Seed, H.B., and Idriss, I.M. (1971). “Simplified procedure for evaluating soil liquefaction potential.” Journal of the Soil Mechanics and Foundations Division, ASCE, 97(SM9), 1249-1273.
  • Youd, T.L., et al. (2001). “Liquefaction resistance of soils: Summary report from the 1996 NCEER and 1998 NCEER/NSF workshops.” Journal of Geotechnical and Geoenvironmental Engineering, 127(4), 297-313.

Calculator Limitations

  • This calculator provides preliminary estimates only and should not replace detailed geotechnical analysis.
  • The simplified procedure may not account for all site-specific conditions and soil behaviors.
  • Results are most reliable for clean sands and may be less accurate for soils with high fines content.