Sites with saturated cohesionless soils within 20 m of GL must be screened for liquefaction. Cyclic stress ratio (CSR) compared with cyclic resistance ratio (CRR) — FoS_liq < 1.0 indicates liquefiable.
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Open Geotechnical AnalysisEditorial paraphrase for fast lookup — the official IS 1893 text is authoritative. For exact wording, refer to the published code.