Abstract
In order to evaluate three-dimensional anisotropy in fracture toughness of rocks, a chevron-notched round compact tension (C-RCT) test has been developed. By adding it to the present ISRM Suggested Methods for Determining the Fracture Toughness of Rock, fracture toughnesses in three perpendicular orientations can be determined with a single boring core. A 3-D boundary element analysis has been carried out first for the C-RCT specimen and evaluation formulae on the stress intensity factor and the compliance of CMOD have been presented. Then after verifying the evaluation formulae by comparing a K-resistance curve of a granite between SR tests and C-RCT tests, three-dimensional anisotropy in the K-resistance curve has been evaluated for two rocks by using three specimen types of CB, SR and C-RCT.
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