Research of the Effect of the Concrete Reinforcement Structure on the Stress-Strain State of Structures

摘要

The results of the research of concrete with dispersed fibers of various materials are presented in the paper. Since, till present, fiber reinforced concrete has not been sufficiently studied as a material of structures, the main emphasis is placed on the consideration of strain characteristics at different stages of loading and the variable reinforcement percentage. The factors of the influence of physical and chemical properties of saturating media on strain properties and the concrete breaking strength were shown. It was substantiated that the conventional mixtures used for the laying of underground cavities have a great strain capacity, as well as insignificant strength, which ultimately predetermines the shifts in the rock massifs after the cavities are eliminated. It has been proved that strong concrete structures cannot provide for long operative conditions in complex hydrogeological conditions. Metal fiber, as a component, contributes to a significant improvement in the backfill strain indexes, but during surface works, for example, through wells, the situations with plugging of the latter are possible because of the possible formation of "hedgehogs" while mixing the mixture. The information on the dosage of metallic and synthetic fibers recommended for the use of dispersed-reinforced concrete is presented. A qualitative and quantitative assessment of the stress-strain state of fiber-reinforced concrete structures is made.