Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 25: Poster Session
MM 25.9: Poster
Mittwoch, 29. März 2006, 15:30–17:30, P4
Investigation of micro-cracks and micro-cavities in rocks by means of tomography — •S. Zabler1, K. Thermann2, B. Kremmin2, A. Rack3, I. Manke1, N. Kardjilov1, and A. Haibel1 — 1Hahn-Meitner-Institut Berlin, Abteilung Strukturforschung — 2TU Berlin — 3Forschungszentrum Karlsruhe - ANKA
The investigation of the microstructure of hard rock as greywacke, limestone or basalt is of special interest for basic research in applied geosciences. Hard rocks are composed of minerals, pores and micro-cracks containing gas or fluids. Technical parameters as permeability, uniaxial compressive strength and deformability (Young modulus) depend on the particular combination of the three phases. First of all, the influence exerted by the cavities as well as the closed and opened micro-cracks on the technical relevant parameters is a subject of research. It is known that compressive deformation is accompanied by nucleation, growth and coalescence of many small fractures. To obtain quantitative information of the pattern of micro-cracks in the past many research projects were performed using geophysical as well as microscopic techniques. In this work high resolution synchrotron tomography and neutron tomography are used for analysis of micro-cracks, micro cavities and the chemical composition of limestone and greywacke and basalt. The rocks were measured before and after uniaxial compression. It was possible to determine where and how micro cracks are initiated.