STUDY ON THE RELIABILITY OF TUNNEL SUPPORT BASED ON THE LOAD AND STRUCTURE MODEL

摘要

The reliability of tunnel engineering influenced by many factors, such as underground water, and its calculation methods include two models, i.e. load and structure model and convergence and constraint model. Firstly, according to the Protodyakonov theory, the compressive and tensile equations of deep and shallow buried tunnel support were discussed, on the base of which the compression reliability equations were derived. Secondly, based on bending capacity of the rusty reinforced concrete, the anchor corrosion was taken into account, the tensile reliability equations of tunnel support were derived. At last, taking one tunnel as an example, the finite element (FE) model was built. Furthermore, in order to investigate the mechanics behavior of tunnel support, the first main stress, displacement of the primary support and the secondary lining and axial force of anchors with different corrosion rate were all simulated and analyzed.