J. Phys. IV France 105 (2003) 321
Anisotropic damage formation in brittle rock: Experimental study by means of acoustic emission and Kaiser effectA. Lavrov1, 2, A. Vervoort1 and M. Wevers3
1 Katholieke Universiteit Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001 Heverlee, Belgium
2 Moscow State Mining University, Physical and Engineering Department, Leninski Prospect 6, Moscow 119991, GSP-1, Russia
3 Katholieke Universiteit Leuven, Department of Metallurgy and Materials Engineering, Kasteelpark Arenberg 40, 3001 Heverlee, Belgium
Compressive or tensile loading of rocks results in anisotropic damage represented by microcracks. Disk specimens of a brittle limestone are initially loaded diametrically, introducing damage as recorded by acoustic emission measurements. Upon unloading, prismatic specimens are cut from the disks in different directions and are tested in uniaxial compression while measuring simultaneously the acoustic emission. An attempt is made to reveal the damage formed under triaxial loading with one of the principal stresses being tensile, by using the Kaiser effect in compressive uniaxial reloading. The results are of importance for the Kaiser effect applications for stress measurements in rocks where one of the principal stresses is tensile.
© EDP Sciences 2003