ASTM D4506-13e1 PDF Download

The ASTM D4506-13e1 standard is a test method used to determine the in situ modulus of deformation of rock mass using the radial jacking test. This test involves subjecting a test chamber of circular cross section to uniformly distributed radial loading and measuring the resulting rock displacements to calculate elastic or deformation moduli. The test takes into account the influence of discontinuities on the properties of the rock mass, making it suitable for obtaining values that represent the true rock mass properties more accurately than other less expensive tests.

The standard emphasizes the importance of competent personnel, appropriate equipment, and suitable facilities in achieving reliable test results. While compliance with Practice D3740 is suggested as a means of evaluating these factors, it does not guarantee reliable results on its own. Users of this standard are cautioned to consider various factors that may affect the quality of the test results.

The test method is based on procedures developed by the U.S. Bureau of Reclamation, employing long extensometers or a reference bar. It provides information on the anisotropic deformability of the rock and allows for the measurement of time-dependent deformation. The application of the test results, however, is beyond the scope of this standard.

The standard also provides guidelines for the use of inch-pound units, significant digits, and rounding, referring to the industry standard procedures. It also acknowledges that material variation, the purpose of obtaining data, special studies, and the user's objectives may require adjustments to significant digits, but it does not cover the specific considerations for engineering design.