In-situ testing of RC track slab in tunnel Ivan and numerical modeling
Institute for Materials and Structures of the Faculty of Civil Engineering in Sarajevo conducted static and dynamic testing of the RC track slab in the railway tunnel Ivan. Due to the tunnel age, traffic in the tunnel was impeded so that the reconstruction of the complete track bed structure was executed. A so-called integrated structure in which the prefabricated sleepers are connected to a stiff concrete slab by using reinforcement was applied for the first time in Bosnia and Herzegovina. The track slab was founded on heterogeneous material which includes weathered marl, granular material as well as amphibolite or schist rocks. The deflections measured under service load simulated by a locomotive and eigen frequencies indicate that the structure is quite rigid. Experimentally obtained data was used for numerical modelling of short-term settlement assuming Mohr-Coulomb material model in Plaxis and the results match quite well.