engleski

Geophysical investigation in water rich mining area

Geophysical research was performed in the opencast mine, the Hinterburg quarry of the Diabaswerk Saalfelden GmbH in Austria, because it already has a long history of slope problems as a result of complex structural geological conditions and difficult water conditions. According to previous research in this area, there are Paleozoic metamorphic and sediment rocks, basaltic eruptive and overlaid quaternary alluvium moraine material. Using electrical-resistivity tomography method and seismic refraction method the lithological and structural relationships in the subsurface were determined as well as presence of water and its influence. Four electrical profiles (p1, p2, p3, p4) and two seismic profiles (P1, P4) were measured. Electrical measurements were performed by multi-electrode geoelectrics using GeoTest software and resistivity models were obtained by DC2DInvRes and Res2dinv software. Seismic refraction measurements were performed using Summit X One technology and seismic velocity models were obtained by Rayfract software. The models obtained coincide well and they indicate a big diabase unit and metamorphic rocks together with sediment rocks and clastic moraine material. Wide range of resistivities is due to fractured rocks caused by numerous faults that are saturated with water that contributes the resistivity reduction.

electrical resistivity tomography, seismic refraction, quarry, diabase rock, land sliding

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