Abstract：By taking an accident of tunnel subfloor water penetration of a coal mine in southwest China induced by blasting as the background，the explosive stress wave and its transfer in rock stratum as well as the rupture process of tunnel subfloor are simulated and analyzed by using the ANSYS/LS-DYNA software. The explosive charge and the effects of rock stratum interface are considered in the numerical model. The critical explosive charge resulting in the concrete subfloor fracture is obtained. The influence of interface of dried and saturated rock stratum on subfloor fracture is studied.
