Soil Liquefaction Cyclic Stress Ratio Calculator
Geotechnical earthquake engineering: Calculate seismic Cyclic Stress Ratio ($CSR$), SPT-based Cyclic Resistance Ratio ($CRR_{7.5}$), and liquefaction triggering factor of safety ($FS_{liq}$) per Seed-Idriss and Youd et al. (NCEER).
Seismic Demand & Site Stratigraphy
Standard benchmark M_w = 7.5
Clean sand equivalent
Liquefaction Safety Assessment
Factor of Safety FS_liq:
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FS = CRR / CSR
Triggering Risk:
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liquefaction susceptibility
Cyclic Stress CSR:
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seismic demand
Cyclic Resist CRR:
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soil capacity (M_w)
MSF Scaling:
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magnitude factor
Effective Stress & Depth Reduction
Total / Effective Overburden $sigma_{vo} / sigma'_{vo}$:
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Shear Stress Depth Reduction $r_d$:
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