2006_NIOSH computer program for bench crest failure analysis_whyatt

2006_NIOSH computer - 1 NIOSH COMPUTER PROGRAMS FOR BENCH CREST FAILURE ANALYSIS IN FRACTURED ROCK J Whyatt(Corresponding Author Spokane Research

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1 NIOSH COMPUTER PROGRAMS FOR BENCH CREST FAILURE ANALYSIS IN FRACTURED ROCK J. Whyatt (Corresponding Author) Spokane Research Laboratory, NIOSH/CDC, 315 E. Montgomery, Spokane, Washington USA Phone (509) 354-8068, e-mail: [email protected] S. Miller University of Idaho, Moscow, Idaho USA J. G. Dwyer Spokane Research Laboratory, NIOSH/CDC, Spokane, Washington USA
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2 SYNOPSIS A package of bench design programs is being publicly released by the National Institute for Occupational Safety and Health (NIOSH). These programs are designed to provide a probabilistic estimate of the likelihood that various widths of catch bench will be retained. Program modules address the mechanisms of plane, plane step path, and wedge failure. Results are drawn from statistical and geostatistical descriptions of fracture characteristics and other input parameters, and reported as the statistical chance that a given width of catch bench will survive, that is, that a catch bench will remain wide enough to catch rolling and sliding material and prevent such material from posing hazards to miners operating below. The capabilities and application of this software are demonstrated through a case example. Comparing bench width estimates obtained using geologic data with actual widths is a key step in verifying that a program is appropriate for particular site conditions and that proper statistical descriptions of fracture parameters for that site have been developed. Such verification efforts improve confidence, and hence usefulness, of this method for designing future slope benches. Development and release of these programs appears particularly timely given recent progress in photoanalysis methods, which promise to greatly reduce the cost of collecting fracture data. INTRODUCTION This paper was developed as part of a research program addressing accidents associated with failure of mine slopes initiated by the Office of Mine Safety and Health, National Institute for Occupational Safety and Health (NIOSH). It describes one part of the program aimed at improving design tools to enhance reliability of catch-bench design, a key safety element of slope design. Associated tasks include identification of hazardous geologic conditions (Girard and McHugh, 2000), continuous (as opposed to point) monitoring of large-scale slope movement (Dwyer, 2003), and development of techniques to warn of small-scale raveling and rock falls (McHugh, 2004). Catch-bench crests are often broken or unstable in surface mines (Figure 1). This is particularly true in highly fractured rock where many joints of limited persistence weaken the crest. Crest stability is important for two reasons. First, benches designed to catch raveling, sliding, and rolling slope material must be wide enough to halt and collect this material. Second, bench crests with low factors of safety may be unsafe to work on, particularly when heavy equipment is being operated near the crest.
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This note was uploaded on 07/11/2011 for the course MINING 435 taught by Professor Susenokramadibrata during the Spring '11 term at ITBA.

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2006_NIOSH computer - 1 NIOSH COMPUTER PROGRAMS FOR BENCH CREST FAILURE ANALYSIS IN FRACTURED ROCK J Whyatt(Corresponding Author Spokane Research

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