Rock blasting with explosives is the first stage of rock fragmentation and plays a key role in results mining chain. Fragmentation optimization achieved by considering energy efficiency explosive, optimal distribution explosive rocky mass, programmed controlled release during blasting. The quality usually performed using tools that estimate sizes fragments via analysis two- or three-dimensional...

In situ stress is one of the most important factors affecting rock dynamic fractures during blasting excavation deep mass that generally hard rock. this research, crater experiments on under different uniaxial static stresses were conducted to investigate initiation and propagation process crack networks induced by coupled loads. Furthermore, effects anisotropic fields blasting, network morphol...

Seeking the law of through-crack in double hole shaped charge can help reveal rock failure mechanism directional controlled blasting. Using LS-DYNA numerical simulation analysis, dynamic mechanical behaviors double-hole crack development and penetration elliptical bipolar linear-shaped blasting ordinary were compared studied. The results showed that it was difficult to form a straight line thro...

An analytical relation between burden velocity and ratio of to blasthole diameter is developed in this paper. This found be consistent with the measured velocities all 37 full-scale blasts from published articles. These include single-hole blasts, multi-hole simultaneously-initiated various borehole diameters such as 64 mm, 76 92 115 142 mm 310 mm. All boreholes were fully charged. The agreemen...

Based on the particle flow code (PFC2D) within discrete element method (DEM), rock mass model was established according to site conditions and blasting simulated by explosive expansion method. The influence of various parameters (the peak pressure action coefficient borehole wall, buried depth, charge mode) in effect investigated. Furthermore, relationship between geometry size crater obtained....