| Abstrakt: |
Abstract: The Kamieniec Dam will be constructed on the Nysa Klodzka River, in the Paczkow Graben situated close to the Sudetic Marginal Fault separating two major geological formations: the Sudety Massif and the Sudetic Foreland (SW Poland). The Tertiary graben has complicated tectonic structure characterized by a network of secondary faults dividing it into smaller blocks. Geodynamic investigations, including analysis of repeated precise levelling measurements, have been undertaken to assess tectonic safety of the planned object. The results indicate present-day tectonic activity in the reservoir area. The analysis of levelling measurements shows differentiated vertical movements of separate tectonic blocks of up to ±(0.3-0.4) mm/year. Satellite GPS observations have proved horizontal movements of individual blocks inside the graben in the western (3 mm/year) and southern (1.5 mm/year) directions. The examined relevant geological and engineering documentations have given evidence of insufficient identification of the dam foundations. The influence of the dam and reservoir on the surrounding ground and faults located about 250 to 350 m on the downstream side of the dam has been modelled with Finite Element Method (FEM). No direct interaction of the structure and nearby fault zone has been found. The results of accomplished studies will act as the reference for future control measurements of the dam and its surroundings. The registered initial state of the ground will allow for reliable interpretation of deformation measurements of the planned dam in the cause-effect aspect. |
