Application of a structural monitoring on segmental tunnel linings

The prediction of the structural behavior and the internal forces acting in segmental tunnel linings is a difficult task and contains uncertainties. In situ measurements within structural monitoring are the only possibility to assess the results under realistic boundary conditions. However, no standardized structural monitoring method for segmented lining exists and consequentially setting up a new monitoring project requires an increased effort. Therefore, in this paper, first, an analysis of experiences in reported monitoring projects is done. Then, a report on a current monitoring project carried out by the authors and the experiences made are presented. Based on these, suggestions are given to facilitate future applications of structural monitoring on segmental tunnel linings regarding conceptualization, instrumentation, installation, operation, and data evaluation.