INVESTIGATION OF STRESS-STRAINED STATE AND OPTIMIZATION OF REINFORCED CONCRETE BLOCK SUPPORT OF AN UNDERGROUND STRUCTURE
The finite elements method analysis of the stress-strained state of the reinforced concrete block mine shaft under the action of rock pressure and mine shaft support dead load is carried out. The element of the mine shaft was selected in the shape of a cylindrical shell. The selected element of reinforced concrete was subjected to bending moment and torque, as well as the normal and shear forces were acted on the sides of the element. In this paper the calculation was carried out in a set of LIRA-SAPR programs. The calculation is based on the possible displacements principle. The minimum of the total energy functional was determined. In the calculation the hypothesis of flat sections was adopted and the diagrams relating stresses and deformations in concrete and reinforcement were taken into account. Optimization of these construct parameters was carried out based on the criterion of minimum cost with compliance between the requirements of the standards for their reliability and load-bearing capacity of a structure.