Propagation Characteristics of Blast-Induced Vibration in Parallel Jointed Rock Mass
Publication: International Journal of Geomechanics
Volume 19, Issue 5
Abstract
Parallel joints are ubiquitous in geological rock mass and seriously affect rock excavation in underground mining and civil engineering. In this study, the propagation characteristics of shock waves subjected to blasting load in a parallel jointed rock mass were investigated using field testing and three-dimensional finite-element numerical modeling. The method of instantaneous energy was first adopted to mine the recorded information about the interaction between joint planes and shock waves; then, the displacement discontinuity method (DDM) was used for the characterization of joint surfaces in the numerical model. The effects of joint mechanical properties, including joint spacing and joint normal stiffness, were also evaluated. The results showed that the instantaneous energy provided a powerful tool for reflecting the localized singularity of energy due to the wave reflection and superposition caused by joint planes. It is clear that the wave reflection in the component perpendicular to the joints was significant with a prolonged action time. Compared with the intact rock mass, the amplitude of shock waves in the jointed rock mass was increased by 2–3 times with highly complicated attenuation, and stress waves were divided into a series of equivalent new sources by the joints in the direction perpendicular to parallel joints. It was also found that the joint properties had a great effect on the propagation of blast-induced vibration.
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Acknowledgments
The authors thank the editors and anonymous reviewers for their great help on this study. This work was financially supported by the National Key R&D Program of China (Grant 2017YFC0602902), the National Natural Science Foundation Project of China (Grants 51874350 and 41807259), and the Innovation Driven Plan of Central South University (Grant 2017zzts182) of China.
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Published In
International Journal of Geomechanics
Volume 19 • Issue 5 • May 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Apr 24, 2018
Accepted: Oct 24, 2018
Published online: Feb 22, 2019
Published in print: May 1, 2019
Discussion open until: Jul 22, 2019
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