00000nam 2200000za 4500 9.840268 CaOODSP 20221107151812 cr ||||||||||| 170725s1966 onc ob f000 0 eng d CaOODSP eng n-cn--- M38-8/26E-PDF M38-8/26 Coates, D. F., 1923- Experimental criteria for classification of rock substances [electronic resource] / D.F. Coates and R.C. Parsons, Fuels and Mining Practice Division. Ottawa : Queen's Printer, 1966. p. 181-189 Reprint series ; RS 26 Cover title. "Reprinted from Int. J. Rock Mech. Min. Sci., Vol. 3, pp. 181-189." Historical publication digitized from print 2017 [by Natural Resources Canada]. Includes bibliographical references. "The classification system previously suggested for consideration uses categories describing both the rock substance and the rock mass. The rock substance was to be classified with respect to strength, pre-failure deformation characteristics and failure characteristics. The divisions within these categories were to be kept to a minimum owing to the much greater importance of structural features in determining the behaviour of most rock masses. Also, the detailed rock properties appropriate for specific problems cannot be considered in a classification system which must be based on information that can be easily obtained. Since the original proposal, many research workers have offered criticisms and alternate suggestions. Also, extensive testing has been done on a wide range of rock substances to determine if the previously suggested criteria produced classifications that are acceptable from a common-sense point of view. As a result of the suggestions by others and the classification testing, it is now recommended that the previous proposal be modified to include the geological name of the rock and to change the dividing line between weak and strong to 700 ksc (10,000 psi). In addition, owing to the variety of patterns of rheological behaviour, it is thought that instead of trying to distinguish between elastic and viscous substances and plastic and brittle failure based on deformation characteristics, it might be better simply to classify the substance as either elastic or yielding with the term yielding meaning a certain minimum time-dependent strain rate or a certain proportion of total strain being permanent. Further criticisms and suggestions are invited"--Abstract, p. 181. gccst Rocks gccst Classification gccst Physics Parsons, R. C. Canada. Natural Resources Canada. Canada. Department of Energy, Mines and Resources. Canada. Mines Branch. Reprint series - Dept. of Energy, Mines and Resources, Mines Branch ; RS 26 (CaOODSP)9.834843 PDF 1.60 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M38-8/M38-8-26-eng.pdf 300105