Retrieving "Joint Roughness Number" from the archives

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1. Rock Mass

   Linked via "Joint Roughness Number"

   RQD: Rock Quality Designation.
   $J_n$: Joint Set Number (accounting for the number of joint sets).
   $J_r$: Joint Roughness Number.
   $J_a$: Joint Alteration Number (related to weathering and infilling).
   SRF: Stress Reduction Factor.