The Hydrogeological Problems Of Disused Mines
In Olgiate Molgora (LC)
Author(s)
L. Longoni & M. Papini
Abstract
The object of this work is to evaluate more effective methodological approaches
to face problems concerning areas affected by the presence of disused mining
sites. Some years after the closure of mines, various problems as a consequence
of disuse have come to light, and also, possibilities to use this resource with
touristic and cultural aims have often been ignored. From the moment they have
been closed mines can cause several problems, both for safety of the mine and of
the neighbouring areas (downfalls, collapse of the vault, variations in the
underground circulation, etc.) so it is necessary to evaluate more suitable
techniques in order to maintain mines and prevent risks related to their presence.
In order to deepen this subject we studied with particular detail a pilot area
representative of the described problems: the Pelucchi Mine sited in Olgiate
Molgora (LC). Several problems occurred in this abandoned area: the most
important being that galleries have been troubled by water infiltration
phenomena, starting from the lower part of the cavity. Previously the water was
pumped away by the water pipeline until the water level was within acceptable
limits, but when the extraction ceased water filled the cavities and saturated all
materials around. This event caused a progressive alteration of the modalities of
the underground water circulation, which in the future could cause instability
phenomena on the surface and in the area near to the caves. In order to check the
stability condition of these mines several analyses, either direct or indirect, have
been made. Indirect analysis was made with the use of Satellite Radar
Interferometry, to make a complete monitoring of surface movements
(subsidence due to the collapse of caves), useful for the mine collapsed
forecasting.
Finally a phenomenological model has been made to define risk scenarios,
necessary for Civil Protection aims and for the instability phenomena analysis.
Keywords: water circulation, mines, risk.
Keywords
water circulation, mines, risk.
Related Book
Other papers in this volume
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