00000nam 2200000za 4500 9.840326 CaOODSP 20221107151820 cr ||||||||||| 170725s1967 onca ob f000 0 eng d CaOODSP eng eng fre ger n-cn--- M38-8/35E-PDF M38-8/35 Coates, D. F., 1923- The effect of stress concentrations on the stability of tunnels [electronic resource] / D.F. Coates, Fuels and Mining Practice Division. Ottawa : Queen's Printer, 1967. p. 299-305 : ill. Reprint series ; RS 35 Cover title. "Reprinted from Proceedings of the First Congress of the International Society of Rock Mechanics, Vol. II, 1966, Laboratorio Nacional de Engenharia Civil, Lisbon, Portugal." Historical publication digitized from print 2017 [by Natural Resources Canada]. Includes bibliographical references. "The stress concentrations around an underground opening may theoretically exceed the strength of the rock mass. Deviations of the actual rock properties from those of homogeneity and perfect elasticity can, however, modify the theoretical stress distributions considerably. In addition, the known variation of the strength of rocks with the volume of the rock makes the predictability of failure due to stress concentration questionable. Several experiments have been conducted which show that failure due to compressive stress concentrations can be predicted under favourable circumstances quite accurately. However, considering failure as a stochastic phenomenon, predictions should be in terms of a probability of failure rather than a certainty. As a result of these experiments, it can be seen that the main requirements to improve the correspondence between experimental results and predicted results is to have better methods for determining the mechanical properties of rock masses"--Summary, p. 299. Includes summaries in French and in German. gccst Mining industry gccst Rocks gccst Physics 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 35 (CaOODSP)9.834843 PDF 2.34 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M38-8/M38-8-35-eng.pdf 300114