A large volume of observations on the movements of the slopes and structures placed on the latter have been made at the Zagorsk pumped-storage power plant, which has been constructed under very complex geologic conditions. The characteristics of the structures and geologic structure of the slopes are well known from numerous publications. The first geodetic measurements to investigate the geodynamics of the slopes were begun during surveys. A plan-elevation network with geodetic beacons was constructed on both sides of the slopes. Sections with active slope processes could be exposed relatively rapidly. In the area of the basic structures, however, we could not, despite use of precise instruments (theodolites, light range finders), ensure acquisition of reliable data on horizontal movements of the slopes (based on the geologic structure, the horizontal component of the movement is appreciably greater than the vertical) with the required mean-square error of 1-2 mm. An increase in accuracy is suppressed not only by the potential of the instruments, but also by external factors (temperature, air pressure, refraction, etc.). Solution of the problem was complicated by the fact that a priori, none of the points of the geodetic network on both slopes could be considered stable (stationary).
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