<p><p><strong>References:<br></strong><em>Yan and Chu (2003a, b)</em></p><p><strong>Method Summarys </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 and 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>