ASTM D8359-21

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1.1”This test method establishes the guidelines, requirements, procedure, and analyses for determining the in situ deformation modulus of a rock mass and other ancillary data using a flexible volumetric dilatometer in an N-size, 75.7 mm (2.98 in.) drill hole (Fig. 1 and Fig. 2). Cyclic, creep, and unloading cycles are not covered in detail in this standard but may be added in the future or with a separate test standard, practice, or guide.