JUSTIFICATION OF GEOSECURITY AND GEOMECHANICAL PARAMETERS OF THE OPERATION OF HYDROTECHNICAL STRUCTURES, FLOW REGULATION AND WATER RESOURCES MANAGEMENT THROUGH HYDROGEOLOGICAL MODELING
Authors:   Dnipro University of Technology, Inkin Oleksandr , Kaluhina Nadiia ,   Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Babii Kateryna ,   Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Hovorukha Oleh ,   Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Khryplyvets Yuliia ,   Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine
Published: February 2024

Purpose. The purpose of this work is the development and verification of the adequacy of the methodology for assessing the hydrodynamic and geomechanical impact of various drainage and hydrotechnical structures on the environment over time, based on hydrogeological modeling, which allows to substantiate the geosafe parameters of their long-term operation and management of water resources. Methods. The proposed comprehensive approach includes: collection and analysis of geological and hydrogeological data on the research area; numerical modeling of hydrodynamic processes; solving inverse problems; execution of predictive calculations regarding changes in the level of groundwater under the influence of drainage and hydrotechnical structures; analytical calculations of subsidence of the earth’s surface caused by this. Findings. According to the results of solving the inverse problems, it was proved that the deviation of the calculated marks of the groundwater levels on the model from the actually established ones does not exceed 0.3 m with a value of the water balance imbalance of 0.001%, which confirms the adequacy of the model and the correctness of the task of filtration characteristics, external and internal hydrodynamic boundaries . The solution of model forecasting problems made it possible to establish that the construction of two ponds with an absolute water mark of 54.0 m and a horizontal drainage 600 m long with a level mark of 56-57 m in the studied area leads to a decrease in groundwater and the elimination of areas under -fillings with a depth of less than one meter. It has been established that with the lowering of the groundwater level caused by the work of hydraulic and drainage structures, the maximum possible subsidence of the soil is 1.5 cm, which does not exceed the allowable subsidence for all types of buildings. Originality. The methodology for assessing the hydrodynamic and geomechanical impact of drainage and hydrotechnical structures on the environment has been substantiated and verified. The proposed method makes it possible to quantitatively assess the hydrodynamic regime and geomechanical state of rocks during long-term operation of these structures in areas with a complex geological structure under the significant influence of natural and man-made factors. Practical implication. The proposed method can be used in the design of new hydrotechnical and drainage structures, as well as the evaluation of parameters of their geo-safe operation, which ensure flow regulation and prevention of flooding of territories.