Study of the Stability Over Time of Microtriangulation Network Station Points, Used as a Reference System for the Determination of the Horizontal Deformations Vector of the Studied Constructions

The determination of the vector of horizontal deformations of the studied constructions, subjected to a complex of static and dynamic forces, is done by several geodetic precision methods, the most used in the case of massive constructions being micro-triangulation. It also includes fixed / station points, made in non-deflecting soils and outside the area of influence of the studied construction. From these, cyclic geodesic measurements are made to the control points fixed on the construction, which change their spatial position with the construction. Based on the angular and linear cyclical measurements, the vector of the horizontal deformation at each control point on the construction is determined. In this sense, the station points must have a fixed position in space, so that the differences between the cyclical measurements to be only due to the changes in the position of the studied construction. In conclusion, in each observation cycle it is mandatory to check / test the stability conditions in the position of the fixed station points, against which the positions of the control points on the construction are reported. There are presented some ways to test station point stability with respect to the reference and orientation points, within the time interval between two observation cycles.