Acoustic Emission and P Wave Velocity Monitoring During Thermal Cracking in a Locally-Heated Granite Block

Features of CO2 fracturing deduced from acoustic emission and microscopy in laboratory experiments

“…Although we did not measure the thermal properties of the Kurokami-jima granite, we believe that the temperature in the specimen did not easily increase within 1 h or so for the SC-CO 2 experiment, even when the outside of the specimen was warmed with the hot water and the wall of the injection hole wall with SC-CO 2 . This expectation comes from our experiences in the heater test in a block of Inada granite whose thermal conductivity is 3.3 W/(m K), specific heat is 0.72 J/(g K), and density is 2.0 × 10 3 kg/m 3 [Ishida et al, 1990]. The similar tendency was also found in heater test in a block of Lac du Bonnet granite by Jansen et al [1993].…”