00000nam 2200000za 4500 9.841732 CaOODSP 20221107152147 cr ||||||||||| 170816s1974 oncabd ob f000 0 eng d CaOODSP eng eng fre n-cn--- f-sa--- M34-20/190E-PDF M34-20/190 Piteau, Douglas R. Plan geometry and other factors relating to natural rock slope stability applied to design of De Beers mine [electronic resource] / by D.R. Piteau. Ottawa : Information Canada, 1974. viii, 120 p. : charts, ill., maps Technical bulletin ; TB 190 "June 1974"--Cover. Digitized edition from print [produced by Natural Resources Canada]. "From Ph.D. thesis, vol. II, University of Witwatersrand, July 1970." Includes bibliographical references. “As part of a major study relating to the stability of rock slopes of De Beers Mine, a detailed investigation was made of the natural slopes of De Beers Mine and four other mines in Kimberley. Attempt was made to determine the controlling factors which either lead to or detract from the stability of the slopes, the main objective being to assess whether the natural breakback of the slopes would jeopardize the main railway line located in close proximity to the pit. Current theories of slope stability all deal with a slope as a two-dimensional problem, i.e. a slice of unit length of an infinitely long slope is considered for a condition of plane strain. In this the tacit assumption is made that the plan radii of the crest and toe of the slope are infinite. This is not the condition encountered in practice, particularly in open pit mining where these radii of curvature have important effects on the safe slope angles. To determine these and other effects a study was made of the slope breakback and other related factors in the four big holes of the diamond mines in the Kimberley area"--Abstract, p. iii. Includes foreward and abstract in French. gccst Mining industry gccst Engineering Canada. Natural Resources Canada. Canada. Mines Branch. Technical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch) TB 190 (CaOODSP)9.834857 PDF 6.65 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-190-eng.pdf 300069