Abstract
Geotechnical data analysis to select a feasible method for development of a long axis, large diameter vertical ventilation shaft
Highlights
The potential for rock mass failure during shaft development and construction affects whether a project is completed safely, on time and on budget
The McCracken and Stacey (1989) method of estimating rock mass stability requires that a rock mass classification (RMC) value, QR, be calculated for a geotechnical interval, which interval is in the order of 3 m long along the length of core (Peck et al, 1989) for a shaft investigation
Results of maximum stable unsupported span (MSUS) for one of the shafts are presented in Figure 2 showing the comparison between wall and face stability, and highlighting potential diameters of interest ranging from
Summary
The potential for rock mass failure during shaft development and construction affects whether a project is completed safely, on time and on budget. The investigations were guided by the method of McCracken and Stacey (1989) together with insights from Peck and associates (Peck, 2000; Peck and Lee, 2007, 2008; Peck, Coombes, and Lee, 2011)
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