<p><p><strong>References:<br></strong><em>Bo and Choa (2004)</em></p><p><strong>Method Summary</strong></p><p>Field vane shear tests involve a vane blade being placed into a borehole and pushed to a certain depth and rotated to measure the undrained shear strength. A field van shear test basically measures the torque required to the blade until failure. A field vane shear test is commonly used to evaluate the undrained shear strength of fine-grained clays and silts or other fine soil. The method is not suitable for assessing sands, gravels, or other high permeability soils.</p><p><strong> </strong><strong>Accuracy and Precision</strong></p><p>Accuracy of the test is dependent on testing procedure and the quality of equipment used.</p><p><strong>Adequacy of Coverage</strong></p><p>Field vane shear tests only provide strengths in the immediate vicinity of testing. Adequacy of coverage will depend on the number of tests performed.</p><p><strong>Implementation Requirements </strong></p><p>Correct implementation of vane shear tests requires training and experience.</p><p><strong>General Comments</strong></p><p>Field vane equipment should be calibrated from time to time. The field tests are terminated when the field vane shear strength reaches 90-100 kPa.</p></p>