Theoretical Models for the Borehole Pressure of Air-Decoupled Charge with Discontinuous Interface Conditions
Publication: Journal of Engineering Mechanics
Volume 148, Issue 11
Abstract
The borehole pressure of the rock mass under blasting under consideration is essentially the pressure of the transmitted shock wave acting on the borehole wall. Its value directly affects the fragmentation degree and damage range of the rock mass around the borehole. The whole-process action mechanism of the shock wave in different media and interfaces for air-decoupled charge explosion was comprehensively analyzed, discontinuous Galerkin (DG) method was used to simulate and solve parameters of the multiple media flow field formed by the detonation products and air in the borehole. Two theoretical calculation models of the borehole pressure of air-decoupled charge with discontinuous interface conditions of the pressure and particle velocity were proposed and their algorithm flows were presented. Furthermore, the reliability and feasibility of the proposed models were verified by comparing with the numerical simulation results of the same example under five working conditions. It is suggested to use different theoretical models when using different decoupling coefficients. It is shown that there is an optimal value of the decoupling coefficient for air-decoupled charge, which makes the rock blasting obtain a high utilization rate of explosive energy and good blasting effect at the same time. This study can provide a theoretical basis for revealing the blasting rock-breaking mechanism and optimizing blasting designs.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to acknowledge the support by the National Natural Science Foundation of China (Grant Nos. 51874123 and 51504082).
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Published In
Journal of Engineering Mechanics
Volume 148 • Issue 11 • November 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Mar 3, 2022
Accepted: Jun 28, 2022
Published online: Sep 7, 2022
Published in print: Nov 1, 2022
Discussion open until: Feb 7, 2023
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