Abstract: The wet sprayed concrete technique has good virtue of improving the working condition within the tunnel. Compared with the common sprayed concrete technique, the wet sprayed concrete technique has fewer reflective concrete loss and higher sprayed concrete quality. It is worth of being spread in the tunnel lining structure construction process. The wet sprayed polypropylene fiber reinforced concrete was first introduced in the Dongjusigou railway tunnel lining structure in China Baoji-Lanzhou resuming line. The nonlinear least square method is used to regress the tunnel horizontal convergence curve at two transverse sections. The tunnel stability fuzzy probability analysis theory is applied to calculate the probability of the railway rock mass stability at different section locations. The analytical result shows that the railway rock mass using the wet-sprayed fiber reinforced concrete lining structure is in stable state and the tunnel rock mass has higher reliability index. The wet-sprayed fiber reinforced concrete lining structure has good lining effect.

Key words: stability analysis, railway tunnel, hard rock mass, wet sprayed fiber reinforced concrete technique, fuzzy probability