A guide to core logging for rock engineering - …
A guide to core logging for rock engineering 2 Proceedings of the Symposium on Exploration for Rock Engineering / Johannesburg / November 1976.Page 71 -86 A distinction is drawn between the borehole log and the corelog.
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CLASSIFICATION // CHARACTERIZATION OF SOME …
www.rockmass.net- Orientation of foliation/bedding/layering - Anisotropy, (schistosity, foliation, bedding) - Weathering or alteration - Strength Other characteristics of rocks :
compressive strength and the factor m in Hoek …
www.rockmass.net2011-02-27 Normal variation of compressive strength and the factor m in Hoek-Brown failure criterion for some rocks (data from Hanssen, 1988; Hoek and Brown, 1980 and Hoek et al., 1992). Rock name Uniaxial compressive strength
Joint characteristics - RockMass
www.rockmass.netJanuary 2015 Reference: A. Palmström, RockMass.net Joint characteristics . Introduction . There is a difficulty in giving a concise definition of what constitutes a joint.
Short on the Q-system - RockMass
www.rockmass.netShort on the Q-system . The Q-system for rock mass classification, developed at the Norwegian Geotechnical Institute (NGI) in 1974, originally included a little more than 200 tunnel case histories, mainly from Scandinavia (Barton et al., 1974). In 1993 the system was updated to include more than 1000 cases (Grimstad and Barton, 1993).
ISRM Suggested methods - RockMass
www.rockmass.net1 ISRM Suggested methods 1. Basic Geotechnical Description of Rock Masses, 1981 April 2. A Survey of Computer Programs in Rock Mechanics Research and …
METHODS TO QUANTIFY THE PARAMETERS APPLIED IN …
www.rockmass.netA3 - 2 . 1 METHODS TO DETERMINE THE UNIAXIAL COMPRESSIVE STRENGTH OF ROCKS . For some engineering or rock mechanical purposes the numerical characterization of rock material
CLASSIFICATION // CHARACTERIZATION OF SOME ROCK …
www.rockmass.netIntact rock strength . The uniaxial compressive strength of a rock material constitutes the highest strength limit of the rock mass of which it forms a part. It is determined in accordance with the standard laboratory procedures. For the purpose of rock mass classification, the use of the well -known point load strength index can be useful as the
The RMR (Rock Mass Rating) system
www.rockmass.netCohesion of the rock mass > 400 kPa 300 - 400 kPa 200 - 300 kPa 100 - 200 kPa < 100 kPa Friction angle of the rock mass o < 45. o. 35 - o45. o. 25 - 35 15 - 25 < 15. o. Table 2: RMR classification guide for excavation and support in rock tunnels (Bieniawski, 1989).
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