Interpretation of the in situ density from seismic CPT in Fraser River sand

The sandy deposits along the Fraser River delta in British Columbia, Canada tested for CANLEX provide a rare combination of reliable in situ measure-ments and laboratory element testing on undisturbed and reconstituted samples, al-lowing for direct evaluation of the capability of analytical methods in obtaining ground truth. This work presents an analytical procedure to obtain the state parameter from CPT tip resistances in the CANLEX dataset. It includes calibration of a critical state constitu-tive model through triaxial compression tests, and analysis of the cone penetration us-ing the spherical cavity expansion analogy. The effects of differing gradations and soil fabrics have been captured and reflected in the resultant state parameter interpre-tation. Accuracy is evaluated by comparison to in situ density measurements and comparison to other methods.