According to barton(1974) the quality of a given rock mass can bedetermined using the equation below. explain each of the parametersin the equation is obtained.
Q = RQD/Jn * Jr/Ja * Jw/SRF
where;
RQD = drill core quality
Jn = number of joint sets
Jr = joint roughness coefficient
Ja = joint alteration number
Jw = degree of water seepage
SRF = stress reduction factor