Abstract
The damage range of surrounding rock has an important influence on optimization of blasting parameters. This study, based on the vibration attenuation law near the blasting source and the characteristics of the load acting on the wall of the smooth blasting hole, derives the distribution formulas of the damage range along the borehole during the expansion and quasistatic processes of detonation gas, respectively. More importantly, the quantitative relationship between the damage range and the charge weight of the single borehole is established. The experimental data are used to verify the correctness of the theoretical formulas. The results show that the damage range during the expansion process of detonation gas presents a continuous saddle-shaped distribution along the borehole and the maximum damage range is near the charge segment. The damage range during the quasistatic process of detonation gas is uniformly distributed along the borehole and can be more conservatively used to the practical prediction after corrected. The theoretical formulas are applicable to the perimeter hole with the radial and axial decoupled charge structure, which can provide a theoretical support for controlling the damage range of surrounding rock according to the charge weight.
Highlights
Explosion stress in rock mass travels as a wave
In this paper, based on the vibration attenuation law near the blasting source and the characteristics of the load acting on the wall of the smooth blasting hole, the relationship between peak particle velocity (PPV) and the damage range is communicated in theory. en, the formulas of the distribution characteristics of the damage range along the borehole are respectively derived during the expansion and quasistatic processes of detonation gas, e differences of the damage range at the charge segment and the air segment are revealed and the relationship between the damage range and the charge weight is communicated by the volumetric decoupling coefficient to predict the damage range. erefore, this study can contribute to optimizing the blasting parameters reasonably and controlling the blasting damage effectively
Based on the vibration attenuation law near the blasting source and the characteristics of the load acting on the wall of the smooth blasting hole, the theoretical formulas of the damage range along the borehole are derived and verified by the measured values. e main conclusions are drawn as follows: (1) During the expansion process of detonation gas, the damage range presents a continuous saddle-shaped distribution along the borehole and the maximum damage range is near the charge segment
Summary
Explosion stress in rock mass travels as a wave. For a particle, it is shown in the form of vibration. The abovementioned studies enriched the blasting vibration theory to some extent, the differences of rock vibration at the charge segment and the air segment in the smooth blasting hole have not been clarified and the relationship between the damage range and PPV has not been communicated from the mechanism. Erefore, it is necessary to theoretically study the distribution characteristics of the damage range along the smooth blasting hole and the relationship between the damage range and the charge weight so as to provide theoretical guidance for experiment and construction. In this paper, based on the vibration attenuation law near the blasting source and the characteristics of the load acting on the wall of the smooth blasting hole, the relationship between PPV and the damage range is communicated in theory. In this paper, based on the vibration attenuation law near the blasting source and the characteristics of the load acting on the wall of the smooth blasting hole, the relationship between PPV and the damage range is communicated in theory. en, the formulas of the distribution characteristics of the damage range along the borehole are respectively derived during the expansion and quasistatic processes of detonation gas, e differences of the damage range at the charge segment and the air segment are revealed and the relationship between the damage range and the charge weight is communicated by the volumetric decoupling coefficient to predict the damage range. erefore, this study can contribute to optimizing the blasting parameters reasonably and controlling the blasting damage effectively
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