<p>Reference(s):</p> <p>Fishman et al. (2005)</p> <p>Ivanovic et al. (2003)</p> <p>&nbsp;</p> <p><strong>Method Summary</strong></p> <p>The GRANIT method is a non-destructive method of monitoring the load on a rock bolt or tie back used in rock slope reinforcement. This testing system can be employed during construction to assure anchors meet the strength requirements, or near the end of an anchor&rsquo;s service life to determine if it requires replacement. An accelerometer and impact device are attached to the exposed end of the reinforcement. The impact device applies an impulse to the exposed end that causes vibrations. Those vibrations are received by the accelerometer. The accelerometer reading is then converted to the load-bearing on the reinforcement device.</p> <p><strong>Accuracy and Precision</strong></p> <p>The test method has shown accuracy and precision when compared to the data obtained by the Pull Test, which is the current standard for measuring load capacity. Electronic signal noise can affect the reading and decrease accuracy.</p> <p><strong>Adequacy of Coverage</strong></p> <p>The test method measures one reinforcement at a time. Enough tests should be conducted in each rock material and reinforcement orientation to find the average bearing capacity of the system with 95% confidence.</p> <p><strong>Implementation Requirements</strong></p> <p>This method is not widely accepted yet, due to the calibrations required. This test method can only be utilized if the existing conditions have already been documented. This is so there is a conversion available to translate the accelerometer reading to a load value. The testing location cannot have electronic signal noise, as it will affect the accelerometer reading.</p> <p><strong>General Comments</strong></p> <p>This is a generally new QC/QA method. As more rock slope stabilization scenarios are documented, the GRANIT method will be more useful. This is a promising test since it is non-destructive, which is the main drawback of the Pull Test.</p>