Deep Underground Engineering and the Use of Artificial Intelligence Techniques : Table 1

Table 1: Name and description of the attributes in the database.

Name	Description
RQD	Rock Quality Designation.
J_w, J_n, J_r, J_a, SRF	Q system factors [71].
Q	Rock mass quality index [71].
Q’	Altered form of the Q index (Q’ = RQD/J_n * J_r/J_a).
UCS	Uniaxial Compressive Strength.
P₁, P₂, P₃, P₄, P₅, P₆	RMR weights related to: UCS, RQD, joint spacing, joint conditions, water conditions and joint orientation.
P₄₁, P₄₂, P₄₃, P₄₄, P₄₅	Joint conditions – persistence, aperture, rugosity, filling and weathering.
RMR, class	RMR proposed by Bieniawski [72] and classification.
RQD/J_n, J_r/J_a, J_w/SRF	Ratios of the Q system parameters.
logQ, logQ'	Base 10 logarithm of Q and Q’.
GSI	Geological Strength Index [73].
N	Altered form of the Q index (Q' = RQD/J_nJ_r/J_aJ_w).
RCR	Altered form of RMR (RCR = P₂+P₃+P₄+P₅+P₆).
φ’, c’, E	Friction angle, cohesion and deformability modulus.