ASTM D7401-08

1.1 These test methods cover the quantitative determination of the working and ultimate static or dynamic capacities of full scale rock anchors. Dynamic capacities are determined to simulate rockburst and blasting conditions (1). The rock anchors are installed in steel pipe to simulate standard boreholes sizes. Rock anchor capacities are determined as a function of resin to steel bolt bond strength and steel bolt yield strength. These tests are not intended to determine rock anchor to borehole rock surface shear strength.

1.2 These test methods are applicable to mechanical, resin, or other similar anchor systems.

1.3 Two methods are provided to determine the capacities of rock anchors, as follows:

1.3.1 Method A - Using a horizontal hydraulically loaded pull test system.

1.3.2 Method B - Using a vertical dynamically loaded drop test system.

1.4 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.

1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D 6026.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.