Principles of ground deformation monitoring at open pit mine with use of GPS technology: KWB "Adamów" in Turek case study"

Mining as well as natural hazards can result in land subsidence and may consequently cause disasters with threat to human life and damage to human property. Determination of deformation indices at area being under influence of open pit mine requires high precision geodetic ssurveys in order to allow for alerting the plausible hazards. In this paper there are presented the principles of the precise determination of the three dimensional displacements with the use of GPS technology elaborated at the University of Warmia and Mazury in Olsztyn. The presented technology has been in use for several years at the area of open pit mine "Adamów SA" in Turek. The technology of field measurements together with the construction of the control network and the observational session was presented. The emphasis was put on the post-processing strategy in precise local satellite networks. Results show that it is possible to achieve 2-3 mm accuracy of 3-D coordinates of the monitored points.