TY JOUR TI Laboratory Testing of Thawing Permafrost Subgrade Soils to Determine Static and Dynamic Deformation Modulus KW Railways KW thawing soils KW subgrade KW static modulus of deformation KW dynamic modulus of deformation KW permafrost soils JO Bulletin of scientific research results AU Svyatogorova, A.V. AU Rubcov, D.V. AU Vel'gun, E.I. AU Sokolov, D.L. PY 2025 IS 2025 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"