Abstract
In the original stability chart by Hunter and Schuster, the stability number NHS is given as a function of the slope angle P and the parameter M, which is equal to l /cR in the author's notation. In their chart, the range of CR is from 0.5 to infinity. Practical experience of using the Hunter and Schuster stability chart has indicated that the value of cR encountered in practice is in the range 0.25 to infinity. In the course of expanding a range of CR in the original Hunter and Schuster's stability chart, it was found that the NHS for a particular slope angle was a linear function of the 1/cR for the range of P 20 as shown in Fig. 1 (Nakase et al. 1981). Then the stability number NHS can be expressed as
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