Scholarly record
OBSERVATION OF SUBSIDENCE DEPRESSION BY MODERN GEODETIC METHODS
Abstract
Underground exploitation of coal deposits in KarvinР° region results in movements and deformations on the surface where a subsidence depression starts to create. The extraction activity under non-trivial geological and geo-mechanical conditions may cause unexpected time-spatial surface changes and different shape and range of creating subsidence depression. To observe the surface changes caused by underground mining in such area we decided to build up an observation station of points that are repeatedly surveyed by GPS and photogrammetry. All the points of the observation station are repeatedly surveyed by static GPS surveying, in interval of circa 1 month, to capture the progressive course of undermining in a continuous process. From the spatial coordinates of points in given time periods we can compute both vertical and horizontal movements, i.e. subsidence and shift of the points. Results are elaborated both in profiles and in area. Photogrammetry has been chosen as an additional method to observe the undermined surface of the whole area. It is scheduled once a year to gain repeated surveying results from which the changes of the subsidence depression can be seen from digital terrain model of the whole area.
Publication details
References3
SCHENK, J.: Measurement of movements and deformations in subsidence depression- in Czech. Ostrava, VSB-TUO, 1999. 144 s. ISBN 80-7078-71 1-2.
DOLEZALOVA, H., KAJZAR, V., SOUCEK, K., STAS, L., SIMKOVICOVA, J.: Creating of observation station for monitoring surface influences of underground mining under nontrivial geo-mechanical conditions. In Proceedings of XIII. International Congress of International Society for Mine Surveying. Budapest, ISM, 2007. ISBN 978-963-9038-18-9.
SURFER 8 - User's Guide. Golden (California, USA). Golden Software, Inc., 2002, 640 s.
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