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1.1 This test method is used to determine the in situ modulus of deformation of rock mass by subjecting a test chamber of circular cross section to uniformly distributed radial loading; the consequent rock displacements are measured, from which elastic or deformation moduli may be calculated. The anisotropic deformability of the rock can also be measured and information on time-dependent deformation may be obtained.
1.2 This test method is based upon the procedures developed by the U.S. Bureau of Reclamation featuring long extensometers
1.3 Application of the test results is beyond the scope of this test method, but may be an integral part of some testing programs.
1.4 The values stated in inch-pound units are to be regarded as the standard.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D653 Terminology Relating to Soil, Rock, and Contained Fluids
D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction
D4403 Practice for Extensometers Used in Rock
D6026 Practice for Using Significant Digits in Geotechnical Data
ICS Number Code 93.020 (Earth works. Excavations. Foundation construction. Underground works)
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ASTM D4506-02(2006), Standard Test Method for Determining the In Situ Modulus of Deformation of Rock Mass Using a Radial Jacking Test, ASTM International, West Conshohocken, PA, 2006, www.astm.orgBack to Top