A Liquefaction Triggering Surface for Ottawa F65 Sand: Cyclic DSS Results and PM4Sand Calibration
Publication: Geo-Congress 2024
ABSTRACT
Liquefaction triggering results from 48 cyclic direct simple shear (DSS) tests are presented for Ottawa F65 sand under constant volume and level ground conditions, at a vertical stress of 100 kPa. An analytical framework is presented to relate relative density (DR), cyclic stress ratio (CSR), and number of cycles to liquefaction (N) using a simple expression with three fitting parameters, which can provide improved interpretation of DSS test results. The expression can be rearranged to be in CSR versus N space, as is traditional when presenting DSS results, or in CSR versus DR space, as is conventional with case history data. The mean liquefaction triggering surface for Ottawa F65 sand is presented together with an estimate of the uncertainty associated with the full experimental dataset. The results are then used to obtain element-level calibrations of the constitutive model PM4Sand across the experimental parameter range that bound the uncertainty from cyclic DSS tests.
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Geo-Congress 2024
Pages: 330 - 340
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Published online: Feb 22, 2024
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