Liquefaction Assessment: CRR_SPT
Seismic soil liquefaction assessment parameters for the Seed-Idriss simplified procedure and Boulanger-Idriss 2014 update — CRR vs (N1)60cs (SPT) and qc1N (CPT) for clean sand, magnitude scaling factors (MSF) for Mw 5.5–8.5, stress reduction coefficient rd vs depth, Kσ overburden correction, CN normalization, fines content correction delta_N, Ishihara surface manifestation H1/H2 criteria, and factor of safety thresholds.
| assessment method | parameter key | fines content pct | n1 60cs | notes | parameter group | parameter name | unit | value max | value min | value typical |
|---|---|---|---|---|---|---|---|---|---|---|
| CRR_SPT | CRR_N1_60cs_10 | <5 | 10 | CRR at Mw=7.5; sigma_v0_prime=100 kPa; FC<5% | crr_spt_clean_sand | CRR for clean sand (N1)60cs=10 | dimensionless | 0.125 | 0.1 | 0.11 |
| CRR_SPT | CRR_N1_60cs_12 | <5 | 12 | CRR at Mw=7.5; Boulanger-Idriss 2014 equation; transitional zone — approaching higher resistance | crr_spt_clean_sand | CRR for clean sand (N1)60cs=12 | dimensionless | 0.148 | 0.12 | 0.13 |
| CRR_SPT | CRR_N1_60cs_15 | <5 | 15 | CRR at Mw=7.5; sigma_v0_prime=100 kPa; commonly referenced design threshold value | crr_spt_clean_sand | CRR for clean sand (N1)60cs=15 | dimensionless | 0.195 | 0.155 | 0.17 |
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