Measurement of Acoustic Emission and Source Location Considering Anisotropy of Rock under Triaxial Compression

摘要

Acoustic emissions (AE) and elastic wave (P-wave) velocities were measured on granite and marble under triaxial compression. The triaxial chamber capable of accommodating many AE sensors was made and transducer vessels measuring seismic wave velocities in axial and lateral direction simultaneously were devised. The measured AE parameters such as AE hit and amplitude were analyzed synthetically and quantitatively to determine the fracture process of rock. Moreover, AE source locating was carried out by considering the anisotropy and change of elastic wave velocity according to the applied stress state. The Kaiser effect was verified at constant confining pressure as well as at multistage confining pressures.