Dynamic photoelastic research and engineering application of chamber blasting at different cavity ratios

In order to analyze the blasting effect of linear charge at different cavity ratios, the changes of stress field and the destroyed effect at five cavity ratios were investigated by dynamic photoelasticity in experimental models. These were applied to 128 t chamber blasting in Shougang Mine in China. The results indicated that the cavity ratio above 4.0 was suitable. And a bigger cavity ratio in a broken stone area was designed for controlling fly rock.