Abstract：The polypropylene fiber reinforced concrete has higher flexibility and is suitable for supporting structure to adapt the rock mass pressure involved in tunnel rock mass stress relaxation during tunnel construction process. The wet sprayed technology introduced in tunnel engineering can effectively improve the working conditions in tunnel and improve the sprayed concrete quality. The wet-sprayed polypropylene fiber reinforced concrete and anchor system introduced in tunnel supporting structure can achieve good economy effect with better supporting structure compared with the dry-sprayed common concrete. For the safety and stability of tunnel construction process，the numerical analysis of the new-type supporting structure stability and the mechanical characteristics is performed using FLAC (fast Lagrangian analysis of continua). The nonlinear properties of material for rock mass is considered in detail. The distribution of displacement，plastic zone of the rock mass and supporting structure and the axial force distribution of anchor bolt are obtained using the numerical analysis．The results show that the supporting structure can effectively reduce the vault downward displacement and the bottom floor upward displacement enlarging the cavity headroom. The rock mass with the supporting structure works well with each other utilizing the utmost self-bearing capacity of the rock mass.
