Development of hybrid steel-fibre reinforced concrete tunnel lining segments - experimental and numerical analyses from material to structural level

作者：Putke T^*; Song F; Zhan Y; Mark P; Breitenbuecher R; Meschke G

来源：Bauingenieur, 2014, 89: 447-456.

Concrete linings are serial products of high quantity. Therefore, a detailed design and an optimisation of materials, reinforcement components and contact points along lining joints leads to more economic solutions. This contribution introduces a prototype concept for the development of optimised concrete lining segments developed in the framework of the SFB 837, taking the shear coupling mechanisms in circumferential joints of tunnel shells as one component to apply a multi-level approach which covers the material, the element and the structural level. A coupled model of a tunnel lining shell is utilised to identify critical regions of linings on the structural level resulting from construction-induced loading. To increase the bearing capacities of joints, a hybrid concept, adding fibres locally to the concrete mix, is proposed. Numerical models for such hybrid linings on the material and structural level are developed in close association with experimental investigations of the effect of fibre type and orientation on the material behaviour. Laboratory tests as well as numerical simulations of optimised lining components based on findings on the material level are performed. As compared to conventional reinforced components, the local reinforcement using steel fibres leads to a considerable increase of the load bearing capacity as well as of the ductility. A good agreement between the predictions by the numerical model and the laboratory results is obtained. The promising results from this prototype analysis constitute the basis for a further research aiming to the development of robust lining systems for mechanised tunnelling.

• 出版日期2014-11