Analysis of natural conditions and the current state of the portals of the tunnel of the Don main canal

The article presents the results of the natural installation of complex threads of the tunnel of the Don main canal in the Rostov region. For the area under consideration, an analysis of the landscape, geomorphological, climatic conditions, factors, the most likely potential objects affecting the safety of the object was carried out. It is recommended to develop and implement observations on the management and maintenance of facilities, which can lead to self-established regular schedules for inspections, maintenance and repair work, as well as the establishment of a monitoring system for the condition of the three sensor strings to check for verification and application problems.

Introduction. The paper analyzes the natural conditions and the results of field surveys of the construction of the northern portal of the tunnel at PK 306+60 and the construction of the southern portal of the tunnel at PK 367+40. It has been established that the supply of water to the Don main canal during the irrigation period increases the level of groundwater in the survey area and causes processes that increase the secondary salinization of the adjacent territory.

Оbject. The tunnel is located on the section from PK 306 + 60 to PK 367 + 40 of the Don main canal on the watershed of the Don and Sala rivers, consists of three lines and is designed to pass the main canal flow into its tunnel part. The inner diameter of each thread of the tunnel is 5.2m. At the entrance to the tunnel is the North portal, at the exit – the South.

Materials and methods. The conditions for the location of the research site are considered. The analysis of geomorphological conditions is carried out, the factors determining the climate of the region are considered. The geological conditions that affect the behavior of groundwater in the survey area during filtration of water from an irrigation source are described in detail. Dangerous exogenous processes are indicated, the most probable are wind, rain, ice, which can reach dangerous values.

Results and conclusions. As a result of the analysis of the survey, the categories of the technical condition of hydraulic structures and the level of their safety were specified. In the process of long-term operation, the reinforced concrete surfaces of the structure and metal structures have undergone significant wear and corrosion, some of the lifting equipment is missing, physically and morally obsolete, and their further operation can lead to an emergency. The inoperability of expansion joints was revealed. These defects make it possible to assess the condition of the structures as limited operable.

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