Volumetric Rock Quality Designation

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Abstract
Three different types of block sizes, namely, bars, plates, and prisms of various dimensions, are related to the classical rock quality designation (RQD) index by means of the volumetric joint count definition. Statistical models are derived analytically by assuming that three sets of fractures at different directions occur according to a negative exponential distribution function of the intact lengths. This distribution function has one model parameter, which is the average number of discontinuities related to the block volume and the volumetric joint count. Necessary charts are presented, which help to identify the representative block size within a rock mass provided that the volumetric joint count and average number of discontinuities are estimated from the field surveys. Furthermore, the global volumetric joint count is defined and related analytically to the nonhomogeneity coefficients in different directions. Finally, relevant analytical expressions are derived and presented in the form of charts f...

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