SCANNING ELECTRON MICROSCOPE AND ACOUSTIC EMISSION STUDIES OF CRACK DEVELOPMENT IN ROCKS

Abstract The microcracks and voids contained in rocks affect their fracture, elastic, thermal and electrical properties. This investigation assesses methods for revealing cracks in unstressed rock and cracks developed during uniaxial and triaxial compression up to failure, using three different rocks: microgranodiorite, dolerite and marble. The techniques used are scanning electron microscope (SEM) analysis of ion-beam etched surfaces, and acoustic emission (AE) measurements. The results are compared with other published data on cracks in rocks and from this a more general picture can be drawn of void/crack development and of damage growth during deformation from zero load up to failure in compression.

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