Abstract
Limestone, dolerite, granite, shale, ballclay and chinaclay from south west England have been classified in terms of rock mass quality by three different systems: point load strength and fracture spacing, the CSIR Rock Mass Rating and the NGI Quality Index system. Comparison with excavation practice in quarries in these rock masses indicates that the CSIR Rock Mass Rating system may give better assessment of rock mass quality related to ease of excavation than the point load strength and fracture spacing and Quality Index systems.
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