Q-system

Q-system

: "For the linguistics formalism, see Q-systems."

The Q-system of rock mass classification was developed in Norway in 1974 by Nick Barton, Lien, R., and Lunde, J at NGI (Norwegian Geotechnical Institute). The system was developed on the basis of an analysis of 212 tunnel case histories from Scandinavia. It is a quantitative classification system and is an engineering system facilitating the design of tunnel supports.Q-system use six different parameters to assess the rock mass quality. The parameters are:
*Rock Quality Designation RQD
*Joint set number "J""n"
*Roughness of the most unfavorable joint or discontinuity "J"r
*Degree of alteration of filling along the weakest joint "J"a
*Water inflow "J"w
*Stress Reduction Factor SRF

The Q-factor can then be calculated as::Q=frac{RQD}{J_n}frac{J_r}{J_a}frac{J_w}{SRF}


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