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Abstract In order to decrease individual judgements caused by the discrete functions in the rock slope stability classification systems，the quantitative indexes of the systems，such as rock strength index(PLS or UCS)，rock quality designation index(RQD)，discontinuity spacing index(Js) and the correction factors of discontinuity direction，i.e. F1，F2 and F3，are systematically modified by continuous functions. The analytical results of 34 typical hydropower engineering rock slopes show that the values of the rock mass rating(RMR)，slope mass rating(SMR) and Chinese slope mass rating(CSMR) obtained by continuous functions agree well with the values obtained by origin discrete functions，and the correlation coefficients between them are 0.96，0.90 and 0.85，respectively. Moreover，there are stronger correlations between the values obtained by the modified functions and the factors of safety of the slopes. This verifies the rationality and reliability of the modification method. Thus，it can replace the origin method to effectively evaluate the stability of rock slope in practice.
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Received: 14 January 2010
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