Geotechnical Tools

Search and use practical engineering calculators. Outputs are preliminary and intended for education, concept screening, and assumption testing.

Liquefaction

Liquefaction Potential

Screen liquefaction triggering with either the TBDY 2018 procedure, in force since 1 January 2019, or an Idriss and Boulanger (2008) SPT-based route.

Units

Enter values and run the calculator.

Liquefaction method

Earthquake magnitude, M_w

Peak Ground Acceleration, PGA(g)

Groundwater depth, GWT(m)

Unit weight, γ(kN/m3)

Fines content, FC(%)

Sample depth, z(m)

Corrected SPT resistance, (N1)60

Liquefaction Screening Sketch

GWT = 1.50 m

z = 4.00 m

Ground surfaceLiquefaction screening depth sketch

Demand and Resistance

CRR_M resistance-

CSR demand-

Interpretation

Liquefaction screening compares CRR_M against CSR at the selected sample depth.

Run the calculation to compare cyclic resistance and earthquake demand.

Important disclaimer

These results are simplified and indicative only. Please review the site-wide Disclaimer before using this tool in any engineering workflow.