DBPapers

OBSERVATION OF SUBSIDENCE DEPRESSION BY MODERN GEODETIC METHODS

AUTHOR/S: H. DOLEZALOVA, V. KAJZAR, L. STAS, K. SOUCEK
Sunday 1 August 2010 by Libadmin2008

8th International Scientific Conference - SGEM2008, www.sgem.org, SGEM2008 Conference Proceedings/ ISBN: 954-918181-2, June 16-20, 2008, Vol. 2, 485-492 pp

ABSTRACT

Underground exploitation of coal deposits in Karvinа 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.

Keywords: undermining, subsidence depression, GPS.