Blasting Source Equivalent Load on Elastic–Plastic Boundary for Rock Blasting
Publication: Journal of Engineering Mechanics
Volume 143, Issue 7
Abstract
Elastic and plastic zone development law is discussed according to the propagation characteristics of elastic and plastic waves induced by rock blasting. The calculation method of the elastic-zone boundary is also obtained in this paper. By introducing the plastic shear modulus into the control equations of elastic and plastic waves, the analytic solutions of elastic and plastic stress waves in rock are obtained, respectively. Then, the stress time-history function on the elastic-zone boundary can be solved by approximate simplification. Analysis of the blasting source stress curve on the elastic-zone boundary shows that the greater the impact loading rate in the rising stage, the faster the blasting source stress attenuation is under an equal-impulse impact load. A simple expression formula of equivalent load on the elastic-zone boundary is proposed by combining the analytical solution and empirical formula of blasting source stress. The new formula has a similar load-curve form as the analytical solution, and it is quite simple, which provides a theoretical basis for blasting vibration characteristic research.
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Acknowledgments
This research is supported by the National Nature Science Foundation of China under Grant No. 11672112, the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20113718110002), the Fund of the State key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact (PLA University and Technology) (No. DPMEIKF201307), Huaqiao University Research Foundation (13BS402).
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 7 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 1, 2016
Accepted: Nov 4, 2016
Published ahead of print: Feb 21, 2017
Published online: Feb 22, 2017
Published in print: Jul 1, 2017
Discussion open until: Jul 22, 2017
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