Abstract
In order to clarify the specimen size requirements for determining the inherent fracture toughness of rocks according to the Suggested Methods proposed by ISRM, short rod testing has been carried out for eight rocks. The K-resistance curve was evaluated for these rocks as well as for three rocks from a previous study. From the results, the specification of the specimen size requirements in order to determine the inherent fracture toughness of rocks is proposed in terms of the critical crack extension at which the corrected (level II) fracture toughness reaches a constant value.
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