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  Load-bearing and Bonding Behavior of Hybrid Concrete Tunnel Lining Segments

  Concrete damages occurring frequently in the peripheral zones of segments cannot be prevented by using conventional steel reinforcement due to the adherence of minimum concrete cover. Based upon this fact, a new concept has been developed to manufacture hybrid concrete segments with a so-called “fresh on solid” production procedure. In this procedure, tailor-cut precast components made of HPSFRC are beforehand positioned in the vulnerable zones of segment in the formwork, followed by the placing of a typical, freshly mixed lining concrete. An experimental study has been conducted to investigate the bonding, bearing and fracture behavior of small-sized hybrid concrete elements. These hybrid specimens were firstly preloaded with a certain level of concentrated load to simulate the assembly of segments by TBM jacks. The structural and fracture behavior of the preloaded hybrid elements were then studied under shearing and tensile loading.

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