ASTM D4395-17 PDF Download

ASTM D4395-17 is a standard test method that provides guidelines for determining the in situ modulus of deformation of a rock mass using the flexible plate loading method. The test results obtained from this method are used to predict displacements in the rock mass caused by loads from structures or underground construction.

The test is conducted using an elastic solution for a uniformly distributed load over a circular area acting on a semi-infinite elastic medium. The modulus of deformation is determined based on the measurements obtained during the test procedure.

The test is usually performed at ambient temperature, but it can be modified or adapted for use at other temperatures if necessary. The standard emphasizes that the quality and reliability of the test results depend on the competence of the personnel performing the test, as well as the suitability of the equipment and facilities used.

The standard also provides information on the preparation, equipment, test procedure, and data reduction for conducting the test. It specifies that the test is typically conducted in an adit or small underground chamber, but it can also be adapted for surface testing with suitable modifications.