TY JOUR TI The key-segment extrusion during the construction of large-diameter transport tunnels KW refabricated high-precision reinforced concrete lining with increased water resistance KW keysegment KW tunnel boring machine KW large-diameter tunnels KW mathematical modeling KW friction force JO Proceedings of Petersburg Transport University AU Konstantinov, V.D. AU Novikov, A.L. AU Sokornov, A.A. PY 2024 IS 21 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"