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sci.liquefaction-potential-CRR Calculator
Calculates cyclic resistance ratio (CRR) from SPT or CPT data and cyclic stress ratio (CSR) from earthquake parameters to evaluate liquefaction potential. Liquefaction factor of safety = CRR/CSR — FS < 1.0 indicates liquefaction; soils with (N₁)₆₀ < 15 in seismic zones require densification or ground improvement.
Inputs
N160 Spt
Reference formula or conversion factor shown for context.
Sigma V Kpa
Internal force per unit area (Pa or MPa). Must stay below yield strength in service.
Sigma Vp Kpa
Internal force per unit area (Pa or MPa). Must stay below yield strength in service.
Amax G
Rate of velocity change (m/s²). Earth's gravity: 9.81 m/s². Objects in free fall accelerate at this rate.
Mw
Reference formula or conversion factor shown for context.
Results
factor of safety against liquefaction FS
Strength / applied load. A safety factor of 2.0 means the structure can handle twice the design load before failure. Buildings: 1.5–3. Lifting equipment: 4–6.
cyclic stress ratio CSR
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
cyclic resistance ratio CRR (Mw-adjusted)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
magnitude scaling factor MSF
A dimensionless multiplier applied in the calculation.
CSR = 0.65·(σv/σv
Reference formula or conversion factor shown for context.
liquefaction risk
Overall risk level based on the computed score or classification. Higher risk may call for mitigating actions or additional review.