Determination of double-K fracture toughness parameters of thermally treated granite using notched semi-circular bending specimen

The safety of cracked rock structures after thermal treatment is the concern of many existing engineering programs. To obtain a deep understanding of rock fracture process, mode I fracture tests are carried out on thermally treated granite (from 25 °C to 800 °C) using notched semi-circular bending (NSCB) specimens in this paper. An acoustic emission (AE) technique is employed to monitor the real-time AE activities during the whole deformation...