Statistical analysis of jointed rock data
Review articleOpen access

AbstractA methodology for the analysis of jointed rock data is described. The situation where a body of rock is divided into distinct blocks by families of roughly parallel fracture surfaces (joints) is considered. During the excavation of a tunnel through such rock, some of the blocks come into contact with the excavation face and may form so-called keyblocks. We address the problems of estimating the number of keyblocks per square metre of an excavation face, evaluating the distribution of keyblock volumes and estimating the probability that a suspected keyblock, part of which is observed as a closed polygon on an excavation face, may form a complete keyblock. Monte-Carlo methods and simulation are used.

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