Generalization and analysis of numerous observation and research data indicate that rock massifs represent compound systems dissected by surfaces and zones of low coherence into separate structural elements (blocks) of different hierarchy [1, 2, 4]. Impact of natural and technogenic disturbances result in the fact that maximum deformation values and their derivates localize at block borders within the limits of weakness zones and in rock interlayers of relatively low strength. The job objective was to reveal basic parameters (such as distance between two homotypic planes and direction) of rocks massif composed of tectonic blocks and evaluation of its impact on development of slope rocks deformations and displacements. The territory of Yuzhniy commercial seaport (Odessa, Ukraine) is the subject of this research. Port constructions are situated on both sides of Adzhalykskiy firth - Odessa port plant is located on its right shore and an oil- terminal with onshore facilities for loading bulk product is on the left shore. During construction of the port, the firth slopes were graded and benched, dredging was undertaken and deep-water berths (18 m) were built at their toes. Meotian age Neogene rocks represented by the clay from tough to hard consistency with interlayers of tough dust sands and low-strength limestones make up geologic structure of the area up to the depth that is of interest to us. Pontic shelly limestones of rather low strength concealed under upper-Pliocene red clay and Pleistocene loess loams and sand clays lay on the eroded level of Meotian deposits.
While the port is being operated, firth slopes and constructions situated on them undergo deformations which are different in magnitude and direction. This fact has brought about the necessity to perform geodetic observations, the analysis of whose results would allow to objectively define the nature of deformation processes and estimate engineering and geodynamical territory conditions. Peculiarities of changes in the deformation condition of an inclined subterranean conveyer gallery section 171 m in length have been chosen as an example in this paper. This section has been the subject of specific geodetic observations performed by the institute of Chernomorniiproect (Odessa, Ukraine) since 1989 (Fig. 1). Analysis results were performed mainly at the department of engineering geology of Odessa National University. The culvert was chosen as the object was chosen as a tool for studying structural and tectonic peculiarities of the territory as it has the following advantages in comparison with other constructions (separate buildings, berth sections, etc.) for geodetic observation. Firstly, underground section of the gallery is a long-haul linear construction that allows, in case of high density (1,5 - 3,0 m) of measurement points, to define the characteristic step of deformational inhomogeneity of the rock mass by deformation rate. Secondly, instrumentalmeasurements are made simultaneously in two parallel ranges that are at the opposite sides of the gallery on the distance of 8,7 m from each other. All these made it possible to determine direction of zones in which the deformations are most conspicuous.