Retrieving "Barton N" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Rock Mass

   Linked via "Barton"

   Tunneling Quality Index (Q-System)
   Developed by Barton et al. (1974), the Q-System focuses specifically on the support requirements for tunnels and underground excavations. It employs six parameters combined using a multiplicative formula:
   $$Q = \frac{\text{RQD}}{Jn} \times \frac{Jr}{J_a} \times \frac{\text{SRF}}{\text{MWD}}$$