Abstract：According to the failure criterion of cumulating damage and one-dimensional spalling model，the condition of collapse induced by conventional explosion has been analyzed. According to correlative standards，the practical calculation method is achieved aiming at the steel fiber shotcrete support used in tunnel. The comparison between the calculated result and the numerical one shows that the calculation method is valid. In order to illuminate the resistance performance of steel fiber shotcrete induced by the conventional explosion quantitatively，the velocities of rockfalls from the top of tunnel supported by steel fiber shotcrete are compared with that of the tunnel supported by other kinds of support and that of the tunnel without support. The practical calculation methods offered can provide some references for design of steel fiber shotcrete support in tunnel.
