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Based on many years of on-site work experience and analysis of the impacts of heterogeneous rock mass structure, rock joints and fissure on blasting in arid regions, it is recognized that deep-hole blasting of heterogeneous rock mass will cause vibration damage to ground building structures. In addition to the influence of lithological structure, it should also take into consideration the distance variations between the location of the blast and the ground building structures. Designing an optimized blasting scheme with shock-absorption and velocity-reduction, together with safe and suitable key blasting technologies for heterogeneous rock, is core to address the safety issues of blasting vibration impact on ground building structures. For this reason, taking the blasting vibration of the second mining area of Mulei Kaiyuan Open-pit Coal Mine as an example, through survey and analysis of the seismic standards of ground buildings, operating environment and geological conditions of the blasting area, an optimized blasting network is proposed. This network involves a key technology that combines multiple blasting unit forms aiming at the realization of unit-dosage multi-stage millisecond blasting of whole or layered interval detonation. The optimized design offers five types of shock-absorption and velocity-reduction multi-stage millisecond denotation networks based on different blasting distances. Together with open-pit coal mine blasting technology, this design can effectively solve the safety issues of close-range blasting vibration on ground building structures.

Optimization of Close-Range Blasting Design with Vibration-Damping and Speed-Reduction for Open-Pit Mine in an Arid Region