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Colloque
The objectives of the research are threefold: 1) outlining the boundaries of old workings, 2) estimating the volume of voids, 3) positioning of cavities in a three-dimensional space. This last problem is the most difficult to solve. In the last 20 years or so, old coal workings started to collapse. This led to social problems. Some visible damages include sinkholes in cultivated and inhabited areas, cracking and sinking of homes and buildings, tilting of high power transmission lines, underground fires difficult to control, water loss, decreased insect for farming and construction, downward ground use pattern, depletion of groundwater, inundation of …
