Determination of Strength Parameters for Specimens Prepared by 3D Printed Discontinuity Planes

Kirmaci A., Erkayaoğlu M., Yardimci A. G.

27th International Mining Congress and Exhibition (IMCET 2022), Antalya, Turkey, 22 - 25 March 2022, pp.213-225

  • Publication Type: Conference Paper / Full Text
  • City: Antalya
  • Country: Turkey
  • Page Numbers: pp.213-225
  • Middle East Technical University Affiliated: Yes


Mining activities in sustainable and safely operated underground mines depend on the design of
openings using rock strength-related parameters representing site conditions as much as possible. Rock
specimens must be collected and prepared for experiments to obtain intact rock properties. In
particular, it is almost impossible to represent field conditions in experimental environments
completely. A well-known example of this challenge is the representation of discontinuities on site. At
this point, using current technologies could improve the level of representation of specimens where 3D
printers could be used to manufacture existing discontinuity planes that reduce the strength of intact
rock material. In this context, a 3D printed discontinuity plane is used to prepare concrete mortar
specimens. Static deformability experiments of these samples were completed to determine the
strength parameters. As a result, the uniaxial compressive strength value of concrete samples without
discontinuity planes was obtained in addition to the samples with rough, wavy, and smooth
discontinuity planes. Finally, the results were compared with stress concentration factors obtained from
the numerical models.