Combining the RMR, Q, and RMi classification systems

Palmström, Arild

doi:10.1016/j.tust.2008.12.002

Cited by 63 publications

(30 citation statements)

References 1 publication

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“…5d). The surveyed caves are mostly E-W oriented, in Set_id discontinuity set, α dip direction, β dip, φ average friction angle, c average cohesion, RMR rock mass rating according to Bieniawski (1989), Q Q-index according to Barton (in Palmström 2009), RMi Rock Mass Index according to Palmström (2009) the same direction of the joint set JN2 and it is possible to infer that this is a direction of weakness of the rock mass, as confirmed by the morphology of the slab (Fig. 7).…”

Section: Conventional Surveysmentioning

confidence: 99%

Terrestrial laser scanning for rockfall stability analysis in the cultural heritage site of Pitigliano (Italy)

et al. 2012

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Traditional surveying methods are often not sufficient to achieve a complete geomechanical characterization of the rock mass, to analyze the instability mechanisms threatening the cultural heritage of hilltop historic towns. In Pitigliano (Tuscany, Central Italy), terrestrial laser scanning was employed complementarily to conventional geomechanical techniques. The overall 3D survey of the exposed surfaces was combined with scanlines of the inner walls of the subterranean cavities running underneath the historic centre. The rock mass discontinuities geometry was extracted, and the most critical instability mechanisms were mapped, with particular interest in the potential impacts on the ancient buildings located along the cliff edge. The geomechanical analysis of the surveyed joint sets confirmed a structural control on the cliff morphology by two main joint sets. Thanks to the laser scanner-based kinematic analysis, flexural toppling and wedge failure were found as the main hazardous instability mechanisms in Pitigliano. Finally, the conservation criticalities were identified and a pilot monitoring system was installed in a sector highly susceptible to block detachment.

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Section: Conventional Surveysmentioning

confidence: 99%

Terrestrial laser scanning for rockfall stability analysis in the cultural heritage site of Pitigliano (Italy)

et al. 2012

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“…poorer rock mass, weakness zone) the rock mass behavior is different from that in case of Q > 1 (jointed rock mass). Thus, Palmström (2009) suggested to have the RMR-Q correlation determined differently for these two rock mass classes, as presented in Fig. 5.…”

Section: Central European Geology 57 2014mentioning

confidence: 95%

Geotechnical rock mass documentation in the Bátaapáti radioactive waste repository

Deák¹,

Kovács²,

Vásárhelyi³

2014

Central European Geology

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The geologic, geotechnical and rock mechanical background of the area, which includes an underground cavern system, is very complex. Initially, to describe the rock mass properties, the RMR and Q systems were used, while the rock support system was based solely on the Q system. Later, during construction of the repository chambers, the GSI system was also introduced in addition to the above-mentioned rock classification methods. The correlation and usage of these three different rock mass classification systems were investigated.Special methods were used to obtain more accurate tunnel mapping and documentation, which is based on photogrammetry and photo analyzer software.According to the results, the correlation between the RMR and Q values is independent of the rock type; basically, the same equation can be used for all (differences between experimental error). The GSI intervals also closely follows the same trend as the results of the other two methods.

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“…Therefore, it is probable that RMR does not work well for many faults and weak zones. Swelling rock is not included in the RMR system [7].…”

Section: Rock Mass Quality Using Rmr (Rock Mass Rating) Classificatiomentioning

confidence: 99%

A New Development of BQS (Blastability Quality System) for Closely Spaced Formations

Chatziangelou¹,

Christaras²

2017

JGRE

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Success in the excavation of geological formations is commonly known as being very important in asserting stability. Furthermore, when the subjected geological formation is rocky and the use of explosives is required, the demands of successful blasting are multiplied. The present paper proposes a classification system, named: BQS (Blastability Quality System), for rock masses with closely spaced discontinuities (spacing lower than 0.1 m). It is obvious that rock quality is one of the main characteristics which define the blast ability of a rock. The BQS can be an easy and widely-used tool as it is a quick evaluator for blastability and rock mass quality at one time. Taking into consideration the research calculations and the parameters of BQS, what has been at question in this paper is the effect of blast ability in a geological formation with closely spaced discontinuities.

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Combining the RMR, Q, and RMi classification systems

Cited by 63 publications

References 1 publication

Terrestrial laser scanning for rockfall stability analysis in the cultural heritage site of Pitigliano (Italy)

Terrestrial laser scanning for rockfall stability analysis in the cultural heritage site of Pitigliano (Italy)

Geotechnical rock mass documentation in the Bátaapáti radioactive waste repository

A New Development of BQS (Blastability Quality System) for Closely Spaced Formations

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