AE in uniaxially loaded granitic rocks in relation to their petrographic character

Abstract

A number of granites, covering a wide range of different petrofabric and geomechanical characteristics, have been tested in the laboratory under uniaxial compressive stress. During these tests the associated AE and the longitudinal and transverse strains were monitored. Later petrographic studies were conducted using optic and electronic microscope techniques in order to study the internal rock fabric evolution while loading. Particular attention was paid to those rock-forming components of geomechanical significance: micro-fractographic network (especially the nature and location of cracks), grain interlocking, mineral alteration, etc. In terms of petrophysical considerations, the studied granites could be grouped into three main types based on their singular AE characteristics.