What is the Liquefaction Assessment multi-solver?

Liquefaction Assessment is a guided workflow that chains 2 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.

Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.

Structural & Geotechnical Pack · Multi-Solver

Liquefaction Assessment

Seismic soil failure. This multi-solver chains 2 solvers into a single guided workflow — run each step in order and carry the result forward.

Workflow steps

seismic
→soil-bearing

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Seismic

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Earthquake Magnitude & ShakingLive

energy · attenuation · intensity

Controls

Presets

Moment magnitude Mw

Distance from epicenter (km)

Magnitude is logarithmic in amplitude but each unit releases about 32× more energy (E ∝ 10^1.5M). Shaking at a site falls off with distance through attenuation. Peak ground acceleration maps to the Modified Mercalli intensity people actually feel — a planning estimate, not a site-specific hazard analysis.

▶ Run in Python

Data Inspector

Energy6.31e+13 J

TNT equivalent15.1 kt

Peak accel.0.3 %g

IntensityIII-IV Light

Governing equation

lo g_{10} E = 1.5 M + 4.8 = 13.8 (M = 6.0)

Reading this result: 30 km out, an M6 quake attenuates to only ~0.3%g — intensity III-IV Light, felt but rarely damaging. Distance and the log falloff tame most of the 6.3e+13 J released.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Soil Bearing

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Soil Bearing Capacity (Terzaghi)Live

foundation design

Allowable bearing pressure

400kPa

Allowable load ≈ 801 kN per metre of footing

Controls

Presets

Cohesion c (kPa)

Friction angle φ (°)

Unit weight γ (kN/m³)

Footing width B (m)

Embedment depth (m)

Factor of safety

Terzaghi's equation predicts the ultimate bearing capacity of a shallow footing as the sum of cohesion, surcharge, and self-weight terms, each with a bearing-capacity factor that grows sharply with the soil friction angle. Dividing by a factor of safety gives the allowable pressure. Educational tool, not a geotechnical design.

▶ Run in Python

Data Inspector

Nc30.1

Nq18.4

Nγ22.4

Ultimate qult1201 kPa

Governing equation

q_{u} = c N_{c} + γ D_{f} N_{q} + \frac{1}{2} γ B N_{γ} = 10 (30.1) + 27 (18.4) + \frac{1}{2} (18) (2) (22.4) = 1201 kPa

Reading this result: Mixed c-φ soil: all three terms contribute — deeper embedment and a wider footing both push the ultimate capacity higher.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Frequently asked questions

What is the Liquefaction Assessment multi-solver?: Liquefaction Assessment is a guided workflow that chains 2 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.
Is it free to use?: Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.