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https://www.ngi.no/eng/Services/Technical-expertise/Engineering-geology-and-rock-mechanics/Q-system
The Q-system can therefore be used as a guideline in rock support design decisions and for documentation of rock mass quality. The Q-system was developed at NGI between 1971 and `74 (Barton et al. 1974).
http://www.rockmass.net/files/short_on_Q-system.pdf
1974). In 1993 the system was updated to include more than 1000 cases (Grimstad and Barton, 1993). It is a quantitative classification system for estimates of tunnel support, based on a numerical assessment of the rock mass quality using the following six parameters: • Rock quality designation (RQD). • Number of joint sets (J n).
https://en.wikipedia.org/wiki/Q-system_(Geotechnical_engineering)
The Q-value determines the quality of the rock mass, but the support of an underground excavation is based not only on the Q-value but is also determined by the different terms in the above equation. This leads to a very extensive list of classes for support recommendations. See also [ edit ]
https://www.researchgate.net/file.PostFileLoader.html?id=59d49b31615e271c63437f53&assetKey=AS%3A545654524964864%401507105584612
The Q-system is a classification system for rock masses with respect to stability of underground openings. Based on estimation of six rock mass parameters, a Q-value for a rock …
https://apps.dtic.mil/dtic/tr/fulltext/u2/a219783.pdf
The Q-System is based on a numerical assessment of the rock mass quality using six different parameters: (a) RQD, (b) number of joint sets, (c) roughness of the most unfavorable joint or discontinuity, (d) degree of alteration or filling along the weakest joint, (e) water inflow, and (f) …Cited by: 21
https://www.rocscience.com/assets/resources/learning/hoek/Practical-Rock-Engineering-Chapter-3-Rock-Mass-Classification.pdf
of this discussion, the most important use of RQD is as a component of the RMR and Q rock mass classifications covered later in this chapter. Rock Structure Rating (RSR) Wickham et al (1972) described a quantitative method for describing the quality of a rock mass and for selecting appropriate support on the basis of their Rock Structure Rating
http://www.geckogeotech.com/q-system-ground-support-for-underground-excavations-tunnels/
The Q-system has always reflected single-shell B+S(fr) concepts of permanent support, as encompassed in the Norwegian Method of Tunnelling (NMT). During the 40 years of its use the Q-value has been shown to have empirical relationships to seismic velocity, deformation modulus, and tunnel or cavern deformation.
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