Analytical Solution for Estimating Sliding Displacement of Rigid Barriers Subjected to Boulder Impact
Publication: Journal of Engineering Mechanics
Volume 145, Issue 3
Abstract
Rigid barriers are commonly used as defense measures in hilly areas to contain falling boulders and landslide debris, and the sliding displacement of these barriers is a key design consideration when space is limited. A new displacement-based model in the form of a closed-form solution is introduced in this paper to estimate the amount of sliding displacement that a barrier undergoes following a boulder impact. The model was derived based on the principles of energy and momentum conservation, and the derivations were presented. Laboratory tests were conducted to validate the analytical model, and the results consistently matched the analytical results for different impact velocities. Finite-element modeling was subsequently carried out on a real-scale barrier in Hong Kong to verify the scale-independent nature of the model. A parametric study was also carried out to investigate the effect of basal friction on the sliding behavior of the barrier. The results revealed that the effect of friction diminishes with increasing barrier:boulder mass ratio.
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Acknowledgments
Financial support from the Australian Research Council (ARC) Discovery Project DP170101858, New Approach for Design of Barriers for Impact, is gratefully acknowledged. This paper is published with the permission of the Head of the Geotechnical Engineering Office and the Director of Civil Engineering and Development, the Government of the Hong Kong Special Administrative Region (SAR). Julian S. H. Kwan is grateful for the financial support from the theme-based research Grant No. T22-603/15-N provided by the Research Grants Council of the Government of the Hong Kong SAR, China.
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Published In
Journal of Engineering Mechanics
Volume 145 • Issue 3 • March 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Apr 21, 2018
Accepted: Sep 4, 2018
Published online: Jan 8, 2019
Published in print: Mar 1, 2019
Discussion open until: Jun 8, 2019
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