Numerical investigation on the stress evolution and failure behavior for deep roadway under blasting disturbance

Abstract

Numerical models of a deep and inverted-U-shaped roadway were established by a particle flow code (PFC2D), and four numerical tests were performed with different blasting locations. The dynamic response characteristics of the deep roadway under blasting disturbance were thoroughly analyzed. According to the failure patterns resulting from the simulations, the dynamic stability of the arch was stronger than that of the vertical wall. The effect of the blasting location on the blasting vibration was assessed, and the diffraction start region and diffraction end region of the stress wave were obtained. The radial stress wave and tangential stress wave around the deep roadway were obtained during the blasting. The results show that the diffraction start region and diffraction end region of the stress wave were related to the fluctuation of stress wave. The effect of depth on the dynamic stability of roadways were analyzed. The results show that the damage around the borehole will be inhibited in the deeper stratum, and the vicinity of the roadway are more prone to break in the deeper stratum.