<p><p><strong>References:<br></strong><em>Yan and Chu (2003a, b)</em></p><p><strong>Method Summary</strong></p><p>Field vane shear tests are performed in the field in order to determine the in-situ shear strength of the soil. Specific guidelines for the test can be found in <a href="http://www.astm.org/Standards/D2573.htm">ASTM D2573. </a></p><p><strong>Accuracy and Precision</strong></p><p>The quality of the result is dependent on the competence of the personnel performing the tests and the quality of the equipment/facilities used. Values of the field vane shear test are also time dependent, with the shear strength of the soil increasing with time of consolidation.</p><p><strong>Adequacy of Coverage</strong></p><p>This method is only able to assess improvement locally. Therefore a field vane testing program should include tests at a number of locations and depths across the site to accurately characterize the shear strength of the soil.</p><p><strong>Implementation Requirements </strong></p><p>Field vane shear testing is a fairly simple concept, but requires specialized equipment and experience.</p><p><strong>General Comments </strong></p><p>Field vane shear tests work well in assessing shear strength changes in the soil. These values are time dependent, increasing with time of consolidation. Final shear strength values are a good indicator of the final results of a PVD and fill preloading project.</p></p>