Abstract
Comparisons of field and laboratory vane shear strength measurements from geotechnical test areas in the San Diego Trough and Gulf of Maine were made to evaluate the influence of vane size, rotation rate, and sample disturbance on vane shear strength. Field vane strengths were observed to be significantly higher than laboratory strengths in both test areas. In-situ strengths obtained with large diameter vanes were consistently higher than strengths obtained with smaller vanes. Comparison of field and laboratory vane strengths with angular shear velocity at the vane blade edges indicated that angular shear velocity can significantly influence vane shear strength measurements. It is recommended that laboratory and field vane shear strengths be determined at a standard angular shear velocity to eliminate many of the uncertainties associated with differences in vane size and rotation rate. An angular shear velocity of 0.5 x 10 - ³ fps (0.15 mm/s) is proposed as the standard for both laboratory and field vane shear strength measurements.
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