DBPapers
DOI: 10.5593/SGEM2015/B22/S9.014

ASPECTS REGARDING THE STABILITY TRACKING OF SUPPORT NETWORK AND LANDMARKS AT CONCRETE DAMS

T. Salagean, M. Ortelecan, T.Rusu, P.Sestras, D. Vele
Monday 21 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-35-3 / ISSN 1314-2704, June 18-24, 2015, Book2 Vol. 2, 113-120 pp

ABSTRACT
In essence, this paper addresses two issues related to the stability tracking of geodetic support network, respectively to the functional-stochastic analysis models used to determine the coordinates of the network points, as well as tracking the displacements of the landmarks located on the downstream of the dam. Support network related to the tracking objective is in the form of a micro-triangulation network, achieved by concrete pillars provided with forced centering devices. Planimetric tracking network used in the case study consists of six pilasters and 25 tracking marks mounted on the downstream face of the dam. The azimuth and zenith observations made in the case of Tarniţa Dam were conducted with total station of geodesic order, Leica TC 2003. A condition for the accurate determination of absolute displacements of the construction is the stability of geodetic network points. Verification of tracking stations stability was made by conditional measurements and indirect measurements method, considering as provisional values the coordinates determined at the "zero" measurement. Because the geodetic network displacements do not exceed allowed tolerances, for the determination of pillars stability it is used the statistical methods. Therefore, after determining the stability of tracking stations, the pillars are considered fixed (old) and proceed to determining the tracking marks coordinates. Planimetric position of the tracking marks was determined by multiple forward intersections. Provisional coordinates of the tracking marks were taken from the "zero" stage of determinations. Probable corrections of these provisional coordinates are obtained from the equation system written for all measured directions.

Keywords: geodetic networks, tracking marks, concrete dams