Energy Transfer and Damage Evolution Process Research of Ore Rock-Filling Body under the Blasting Load

Abstract

The low intensity and frequent blasting shock wave created by a blasting impact will exert notable destructive effects on an ore rock-filling body. In order to investigate the energy transfer process of the blasting shock wave energy in the filling body and the damage evolution process of the filling body, the software PFC2D was used to numerically simulate and monitor the blasting stress curve of the stope and the energy transfer process. In addition, the incident of the pulse wave with the transmission boundary of the filling body was employed to obtain the fitting curve of the stress wave energy. Simultaneously, the language FISH was adopted to realize the two-dimensional visualization of the damage degree. The results indicate that: (i) the upper side of the filling body is accessible to generate energy superposition, and the shock wave is diffused in a waveform. Moreover, a few large and deep cracks are produced in the central area; (ii) during the blasting process, the damaged area extended continuously from the bottom to the top along the boundary surface of an ore rock-filling body and finally diffused to both sides; (iii) the energy attenuation of the stress wave in an ore body roughly performs the distribution of power function. Consequently, the research results can contribute to the safety evaluation of mining engineering using differential blasting technology.