ANALYSIS OF THE IMPACT OF THE CONSTRUCTION TECHNOLOGY OF A COLUMN-TYPE METRO STATION ON THE STRESS-STRAIN STATE OF ITS STRUCTURE

Purpose. The purpose of the scientific research is to analyze the influence of the construction technology of the metro column station on the stress-strain state of its structure. The achievement of this goal is based on the numerical analysis of the metro column station, during which the construction stages of the underground facility are taken into account. Methodology. To calculate the stress-strain state of the column-type station structure at different stages of the station lining construction, the modern LIRA-CAD calculation complex was used. Eight stages of the station construction were considered, for which finite element models were developed. After creating finite element models for the eight stages of the column station construction, a numerical analysis was performed. Findings. The main results of the work demonstrate that the correctly selected construction technology is critically important for ensuring the stability of the station structures and minimizing the risks of deformations in the soil. The study considers the stages modeling of the station construction using the LIRA-CAD software package. Thanks to this, accurate data on the structural performance of the structure at different stages of construction were obtained. The results obtained allow to state that the proposed construction technology provides high reliability and durability of the column station, and also minimizes the negative impact on the rock massif. This is confirmed by low settlement values and uniform stress distribution in the structure. Moreover, the proposed safety measures and recommendations for monitoring the condition of structures can be used to increase the efficiency of the station operation in the future. Originality. The originality lies in the fact that the analysis of the results showed that the greatest stresses occur in the connection zones of the central and side tunnels, which requires special attention to the design and construction of columns and lining of the station. Practical value. The practical value lies in the fact that the developed recommendations for strengthening stressed zones allow to significantly increase the safety of operation.