抄録
This paper describes a new method for the determination of fracture toughness of rock by the use of core boring data. In order to examine the validity of this method, the fracture toughness values of the core specimens at the Eastern Hachimantai field, the model field of the F-project at Tohoku University, were compared with those evaluated by this method. Then, both results agreed satisfactorily. This method could be also useful to in situ measure the fracture toughness value of rock.
