Blast-induced damage characteristics and fracture mechanism of rock mass under initial stress

MA Sizhou; LIU Kewei; YANG Jiacai; LI Xudong; GUO Tengfei

doi:10.11883/bzycj-2023-0151

Volume 43 Issue 10

Oct. 2023

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MA Sizhou, LIU Kewei, YANG Jiacai, LI Xudong, GUO Tengfei. Blast-induced damage characteristics and fracture mechanism of rock mass under initial stress[J]. Explosion And Shock Waves, 2023, 43(10): 105201. doi: 10.11883/bzycj-2023-0151

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Blast-induced damage characteristics and fracture mechanism of rock mass under initial stress

doi: 10.11883/bzycj-2023-0151

School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China

Received Date: 2023-04-26
Rev Recd Date: 2023-06-26
Publish Date: 2023-10-27

Abstract

Abstract

The technique of drilling and blasting is widely applied in rock excavation, and its working efficiency mainly relies on the rock mass structure and geological conditions. The initial stress plays a crucial role in the blast-induced cracking behavior and failure characteristics, and troubles such as over/underbreak and insufficient fragmentation may be arisen in deep rock masses, leading to other issues related to the waste of mineral resources and production costs. In this paper, the damage features and fracture mechanism of rock blasting under various initial stresses were studied using combined theoretical analysis and numerical simulation. Considering the effect of initial stress on the mechanical response of rock blasting, a theoretical model for single-hole blasting was developed based on elastic mechanics, and then the features of static stress distribution and dynamic pressure evolution were analyzed separately, revealing the fracture mechanism of rock blast-induced damage under initial stress. In addition, the Riedel-Hiermaier-Thoma (RHT) model parameters of rock were determined and adjusted based on a series of empirical formulas as well as dynamic mechanical tests. After calibrating the numerical model against the blasting crack pattern and attenuation of peak pressure by combining test and theoretical results, the single-hole geometric model was created and meshed in the commercial software ANSYS to study the dynamic tangential stress evolution as well as cracking behavior, and the fractal features of rock blasting cracks under different initial stresses were also discussed. The results show that the rationality of the theoretical model can be proved by the numerical simulation: the tangential tensile stress is a critical factor affecting the blasting crack propagation and the rock fragmentation can be improved by adjusting the distribution of hoop stress reasonably when the initial stress is large. In practical engineering, the stress distribution can be changed by controlling the field of geo-stress with presplitting technology.
- initial stress,
- rock blasting,
- theoretical model,
- numerical simulation,
- crack propagation,
- fractal dimension

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References

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