ANALYTICAL REGULARITIES OF FORCE FACTORS IN THE LINING OF A THREE-VAULTED METRO STATION WITH VARIATION OF THE ELASTIC RESISTANCE COEFFICIENT OF THE ROCK

Purpose. The purpose of the scientific article is to conduct a numerical analysis of pylon station models and obtain force factors for its lining. Based on the obtained factors (bending moments and normal forces), it is planned to obtain their analytical regularities for the varying elastic resistance coefficient of the rock. Methodology. The calculation scheme of the station structure should be chosen so that it corresponds to the real operating conditions of the lining to the greatest extent, reflecting the design features, lining material, geological conditions, and the construction method. The SCAD calculation software was used to calculate the pylon-type station. Findings. The foundations of mathematical modeling of a pylon station by the finite element method in a spatial setting were developed using the modified Metrodiprotrans method (based on FEM), models calculations for pylon deep metro stations were carried out by determining the parameters of equivalent bars in a spatial setting. Using the results of the regularities between the strength coefficient and the deformation characteristics of the soil (deformation modulus and Poisson's ratio), analytical regularities of force factors were determined for varying properties of the surrounding massif (elastic resistance), which for moments are power nonlinear regularities, and for normal forces are linear functions, furthermore the change in the elastic resistance coefficient with respect to the strength coefficient is a nonlinear polynomial. Originality. The originality of the conducted research lies in obtaining analytical regularities of force factors for varying properties of the surrounding massif based on the results of numerical analysis conducted on the basis of the finite element method using the modified Metrodiprotrans method. These regularities allow predicting the change in bending moments and normal forces depending on the change in geological conditions at the design stage. Practical value. The practical value of the research lies in developing the basics of the methodology for taking into account the spatial factor in the calculations of three-vaulted metro stations. This allows for more complete consideration of the complex irregular structure of pylon-type stations and obtaining force parameters in its lining that are more adequate to the real situation.