The paper presents the selected results of geophysical surveys carried out in the area of former limestone mining excavation in the village of Nowa Wies Klodzka (Lower Silesia region, Poland). The aim of the study was to detect fractured zones existed around the excavation, which could threaten the stability of the earth surface. Geophysical surveys were carried out in 2D mode using of the following methods: gravimetry, georadar and resistivity imaging. Gravimetric measurements were conducted at stations designed with constant interval equals 2m; georadar reflection profiling was carried out using of 250 MHz antenna and traces were recorded with distance interval equals 0.005m; the electrodes spacing for resistivity imaging technique equals 1m and 1.5m and the dipole-dipole measuring arrays were used for recognition. For correct geophysical interpretation 3D model of the excavation was performed on the basis of laser scanning technique. Gravimetric interpretation did not indicate to existence of the fractured zones above the excavation. Georadar method, due to the very high resolution of this technique, allowed to determine the fractured zones and weathered areas near the excavation. In addition resistivity imaging technique allowed to outline subsurface layer with lower resistivity which can be the effect of water saturation on the rock mass in vicinity of the excavation.
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Faculty of Environmental and Power Engineering
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Creative Commons; cc by 3.0 pl
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