Abstract: The whole mechanical properties between steel fiber concrete and plain concrete are compared and analyzed, and the mechanism of the crack resistance, reinforcement, and toughing of steel fiber are studied. According to the deformation characteristics of the deep soft rock roadway in No.8 Hebi Coal Mine, the factors for roadway deformation is analyzed. The approach of improving the overall mechanical properties through incorporation of fiber in plain concrete is proposed, which can adapt with the large deformation of soft rock roadway. The numerical model with FLAC3D is employed to compare the support schemes and a reasonable support scheme is put forward. The support scheme is practiced successfully at the middle section of 3105 tunnel of Hebi No.8 coal mine with the excellent technical and economic results obtained.

Key words: Soft rock roadway, Steel fiber concrete, Support, Numerical simulation