ASTM D8359-21
Standard Test Method for Determining the In Situ Rock Deformation Modulus and Other Associated Rock Properties Using a Flexible Volumetric Dilatometer
ASTM International , 08/15/2021
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.
FIG. 1''General Depiction of a Flexible Dilatometer, Deflated (a) and Inflated (b) in a Borehole
FIG. 2''Cross-Sections of the Borehole and Dilatable Membrane Portion of the Dilatometer in the Uninflated, r = 0, Starting Position
Note 1:''Other rock mass deformability tests are radial jack tests, flat jack tests, flexible plate tests, and borehole jack tests.
