Empirical Equations for Determining Residual Strength of Fibre-Reinforced Concrete in Accordance with Standard BDS EN 14651, Based on Statistical Analysis of Experimental Data

At the design stage of tunnel linings reinforced with fibre reinforcement in weak rocks or soils, there is ambiguity in determining which parameters to use for the dispersion reinforced concrete due to a lack of clarity. At this early stage, experimental data and specific results are crucial to determine the recipe for the concrete. The initial determination of most mix parameters, such as the material of the dispersed reinforcement, the quantity incorporated in the concrete, and the manufacturer/supplier of the dispersed reinforcement, needs to be clear and concise. The aim of this paper is to introduce mathematical empirical relationships (equations) to be utilized during the design phase and later substantiated by testing or observation of tunnel linings behaviour, following the accurate assessment of concrete composition and dispersed reinforcement parameters.