Physical modeling as a verification tool for geomechanical tasks solving

to verify the mathematical model of the interstation and station subway tunnels junctionsection by creating a physical model using the method of equivalent materials. To analyze the formation of vertical loads from ground pressure on the tunnel linings, taking into account the selected sequence of work. To establish the station tunnel and its face wall influence on the interstation tunnel lining stressstrain state, and determine the size of this area of influence based on the simulation results. Methods: the finite element method in combination with the analytical method (mathematical modeling), the method of equivalent materials (physical modeling). Results: patterns of load distribution from vertical ground pressure on the interstation tunnel lining at the interface with the deep shallow pylon station have been revealed. It was found that on the approach to the face wall of the station, the interstation tunnel lining perceives the vertical load from the ground pressure, exceeding the load on the lining outside the area of the station influence by about 2–4 times. In addition, it was found that the initial deformations of the station workings lead to an increase in the load on the interstation tunnel. Thus, it is rational to forecast the load from the ground pressure on the interstation tunnel lining, taking into account the initial deformations of the station workings. It is established that the boundary of the station tunnel influence area on the stress-strain state of the interstation tunnel lining practically does not depend on the depth of laying and can be assumed to be 7 m. Practical significance: the results of the study can be used at the design stage of the interstation and station tunnel junction to determine the length of the interstation tunnel section with reinforced lining.