Zmienność wskaźników deformacji powierzchni terenuvWieliczki

Abstract

Variability of ground surface deformation indexes in Wieliczka areaA b s t r a c t . To define the character of the variability of deformation indexes in the area of Wieliczka, geostatistic analysis was carried out with the use of semivariograms (pattern 1) of the distribution of subsidence (W), horizontal displacements (U), inclinations (T) and horizontal strains (ε) for 5 out of 11 observation lines located in central part of theWieliczka area (G—Grabówki, K—Kościuszko, D—Daniłowicz, P—Kopernik, R—Rożnowa). The aim of the analysis was to assess the role of the random factor in total variability of the indexes. The results of calculations (tab. 1) indicate that horizontal strains (ε) are practically random, i.e. do not depend on the correctness of deformation process. Their application in defining borders of category of the area is loaded with too high uncertainty. For small study areas, e.g. around individual buildings, the strain becomes the basic indicator to be taken into account in predicting degree of damage. Inclination (T) is an index that should be analysed in the landslide areas (as sometimes even a small increase of a steep inclination can initiate a landslide process) and in the case of very tall buildings. For curvatures (or curvature radius R) it is difficult to determine and interpret measurement results, thus they were not studied. Only subsidence (W) and horizontal displacement (U) of the points are characterized by a small participation of the random component. The studies indicate that in determination of category of the mining area the deformation indexes should be analysed individually and not in combination. Interpretation of results makes it also necessary to consider the observed trend to overestimations of the random factor participation by the method of semivariograms.