Based on the big-span metro tunnels, the thesis primarily studies the mechanical characteristic, the stability and the construction methods about the big-span tunnels.
Solutions of geomechanical problems in terms of full and additional displacements are compared for the example of the creation of the mined-out space filled with stowing and the construction of a subway tunnel.
A procedure is proposed to calculate air-distribution for secure evacuation of passengers when removing gases produced by a burning train in a subway tunnel.
Based on the experimental investigation, the mathematical model is proposed for an air flow excited by the piston effect of a train movement in the Metro tunnel.