TY JOUR TI Three-Dimensional Mathematical Model of a Single-Vault Metro Station KW Metro KW single-vault station KW mathematical modelling KW finite elements method KW FEM JO Proceedings of Petersburg Transport University AU Ledyaev, A.P. AU Sokornov, A.A. AU Kon'kov, A.N. PY 2025 IS 22 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"