<p><p><strong>Reference(s):</strong></p><p><em>Vennapusa and White (2009)</em></p><p><strong>Method Summary</strong></p><p>Static Plate Load Tests (PLT) involve obtaining load versus deflection curves to determine modulus of subgrade reaction, soil elastic modulus, or soil bearing capacity. The test is conducted by increasing a static load on the soil and recording the corresponding plate deflections. ASTM D1195-93 describes the test method to perform repetitive static plate load tests of soil for evaluation and design of airport and highway pavements. AASHTO T-222 describes a standard method for non‑repetitive static plate load test of soils and flexible pavement components.</p><p><strong>Accuracy and Precision</strong></p><p>The test is widely accepted in geotechnical engineering. ASTM D1195-93 indicates that the precision of this test method could not be determined due to the variability associated with soils and the accuracy of the test method could not be determined as there was no reference test available for comparison.</p><p><strong>Adequacy of Coverage</strong></p><p>Sufficient evaluation requires many tests. The Landpac (2008) specification recommends performing one static PLT over a trial compaction section with dimensions of about 4 by 40 meters.</p><p><strong>Implementation Requirements </strong></p><p>Experience and special equipment is necessary to produce enough reaction force for the required applied stresses. Typically, a heavy truck or a dozer or any heavy construction equipment may be used as a reaction force. A trained field engineer is required to analyze load-deflection curves and relate the measured properties with the design assumptions.</p><p><strong>General Comments</strong></p><p>This test method provides a direct measure of modulus and/or bearing capacity and can serve as a QA tool for verifying design values.</p></p>