Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2018-16
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
24 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).
The effects of cushion's particle size and thickness on coefficient of restitution under the rockfall impacts
Chun Zhu1,2,3, Dongsheng Wang2,3, Xing Xia2,3, ZhiGang Tao2,3, ManChao He1,2,3, and Chen Cao1 1College of Construction Engineering, Jilin University, Changchun 130026, China
2State Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing 100083, China
3School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
Abstract. Gravel cushion is widely used for rockfall prevention in open-pit mine to absorb energy, the energy-consumption and buffer mechanism of different thickness and particle size of gravel cushion under the impact effects are studied. A series of laboratory tests for different cushion are conducted, combining the blocks' volume and drop height. The First tests under the condition of same release height of rockfall are carried out, the results indicate that under the different impact energy, the change of cushion's thickness have an obviously different effects on the coefficient of restitution (COR) of cushion. The second tests under the condition of same cushion thickness are conducted, when the blocks of different radius colliding with the cushion of same thickness, the COR change range of blocks of a big radius is larger than those blocks with a relatively small radius. For further research the influence degree of cushion's particle size and thickness on the COR when rockfall moving through the cushion, based on orthogonal test principle, 32 orthogonal tests are conducted, the influence law of all factors on COR and damage depth L of cushion are explored. The test results show that the cushion's thickness h should be considered firstly during the process of the cushion design, and reasonable cushion not only effectively reduce COR, but also maintain its stability, which provides theoretical and practical basis for the wide application of cushion design to control rockfall.

Citation: Zhu, C., Wang, D., Xia, X., Tao, Z., He, M., and Cao, C.: The effects of cushion's particle size and thickness on coefficient of restitution under the rockfall impacts, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2018-16, in review, 2018.
Chun Zhu et al.
Chun Zhu et al.
Chun Zhu et al.

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Short summary
Gravel cushion is widely used for rockfall prevention in open-pit mine to absorb energy, the energy-consumption and buffer mechanism of different thickness and particle size of gravel cushion under the impact effects are studied. A series of laboratory tests for different cushion are conducted, combining the blocks' volume and drop height. It provides theoretical and practical basis for the wide application of cushion design to control rockfall.
Gravel cushion is widely used for rockfall prevention in open-pit mine to absorb energy, the...
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