The existence of the interface between soft and hard rock often makes it difficult to control blasting effect. Studying influence structural plane delayed initiation time on characteristics can make effect more controllable. In this paper, by using Particle Flow Code (PFC 2D ) particle expansion algorithm, double-hole experiments soft-hard are carried out, results analyzed from perspectives fra...

Bunch-holes blasting (several blastholes arranged in a bunch with short spacing and detonated simultaneously to form large common crater) is typically used underground mines increase efficiency under single free surface. Considering the low accuracy of pyrotechnic detonators, which are commonly Chinese mines, bunch-holes same nominal times actually short-delay blasting, actual delay intervals i...

Issue: Processed recycled glass has been sold as an abrasive blasting medium under several brand names in different parts of the United States. However, limited public information is available regarding the performance of finely sized crushed glass in abrasive applications because manufacturers have developed their own proprietary data. Historically, the predominant material used for abrasive b...

The application of underground pre-concentration technology to narrow vein mining has the potential to change the entire economics of bulk mining methods when used in narrow vein situations. The rejection of waste at or near the face means that a higher-grade ore can be sent to surface. The waste rock can be reused directly as backfill. Swelling of the muck through blasting means that only 60 t...

in blasting operations different proportions of the energy released are consumed in fragmenting the rock mass, heating up the surrounding and some portion of it is used in propagating blast waves, causing vibration of the particles in the nearby environment. however, reflections, transmissions and absorptions lead the attenuation of these waves. the influence of the extent of rock-mass disconti...

In large open pit mines prediction of Peak Particle Velocity (PPV) provides useful information for safe blasting. At Sungun Copper Mine (SCM), some unstable rock slopes facing to valuable industrial facilities are both expose to high intensity daily blasting vibrations, threatening their safty. So, controlling PPV by developing accurate predictors is essential. Hence, this study proposes improv...