<p><p><strong>Reference(s):</strong></p><p><em>Gomez (2009)<br>Lazarte et al. (2015)<br>Porterfield et al. (1994)<br>SHRP2 Phase I Technology Assessment (2008)</em></p><p><strong>Method Summary</strong></p><p>The creep test is typically a component of the pullout/verification test in which the soil nail is stressed at a constant load as strain and deformation are measured. According to Lazarte et al. (2015), “Creep testing is conducted at a specified, constant test load, with displacements recorded at specified time intervals.”</p><p><strong>Accuracy and Precision</strong></p><p>This is a fairly precise test that measures the actual creep characteristics of an installed soil nail.</p><p><strong>Adequacy of Coverage</strong></p><p>A small number of representative nails are tested, which provides minimal adequacy of coverage.</p><p><strong>Implementation Requirements </strong></p><p>According to the acceptance criteria in Porterfield et al. (1994), a single creep test can last up to 60 minutes during a pullout test. Creep tests are usually included as one of the loading increments during pullout testing.</p><p><strong> </strong><strong>General Comments</strong></p><p>This tests that the soil nails will not be subject to a more than acceptable level of deformation over their service life. Short-term creep tests are performed as part of all verification and proof tests in accordance with industry standard documentation. Separate long-term creep tests are appropriate where soils are expected to be creep susceptible or plastic. Creep testing is applicable to performance and method approach specifications.</p></p>