Abstract
Underground gravity surveys are usually conducted in order to define geological structures and to locate and delineate ore bodies. In the coal mines, on the other hand, these surveys are often applied in solving stability and safety problems of the mine. Basic principals of underground gravity measurements and examples of application in coal mining are presented. Complex geophysical and geological investigations were conducted in a wider area of the coal mine 'Trbovlje - Hrastnik' (Slovenia) in purpose to define geological features and delineate potentially dangerous zones, connected to the subsidence, rockslides and water penetrations into exploitation galleries of the mine. Gravity and microtremor measurements were conducted in the mine galleries. Compilation and interpretation of subsurface gravity anomaly maps and interval density map is presented.
Highlights
Basic aim of gravity surveys is to define rock density distribution in purpose to construct geological model of the investigated area
Underground gravity measurements are differently influenced by density variations below and above measurement station, so it is often hard to separate those influences
When measurements are conducted at a horizontal gallery in a deep mine, density variations in the area surrounding the gallery usually have a very small influence on surface gravity data, but their influence on calculated interval densities is significant
Summary
Basic aim of gravity surveys is to define rock density distribution in purpose to construct geological model of the investigated area. When measurements are conducted at a horizontal gallery in a deep mine, density variations in the area surrounding the gallery usually have a very small influence on surface gravity data, but their influence on calculated interval densities is significant. Ones the density model is formed, gravity monitoring is used to detect the occurrences of density variations that might be connected to a development of degradation or other process in rock masses. Such a process can endanger the mine safety, so the early detection of any change in rock masses is very important
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