The processes operating within a rock weathering system may be described qualitatively in the form of an interaction matrix, comprising those factors which are considered significant in the system and the mechanisms operating between them. A method of assigning site-specific values to the significant factors is developed, enabling a quantitative analysis of the effects of weathering on the rock mass. Applying an integer code to the interactions enables the individual factors' influence within the system to be assessed. An index for weathering may be derived from this analysis and used, in conjunction with an index for engineering geological properties, to characterize and zone a weathered rock mass.

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