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| Titel |
Impact of rockfalls on protection measures: an experimental approach |
| VerfasserIn |
J. K. Yuan, Y. R. Li, R. Q. Huang, X. J. Pei |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 4 ; Nr. 15, no. 4 (2015-04-23), S.885-893 |
| Datensatznummer |
250119427
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| Publikation (Nr.) |
 copernicus.org/nhess-15-885-2015.pdf |
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| Zusammenfassung |
| The determination of rockfall impact force is crucial in
designing protection measures. In the present study, laboratory tests
are carried out by testing the weight and shape of the falling rock
fragments, drop height, incident angle, platform on the slideway, and cushion
layer on the protection measures to investigate their influences
on the impact force. The test results indicate that the impact force is
positively exponential to the weight of rockfall and the instantaneous
impact velocity of the rockfall approaching the protection measures. The
impact velocity is found to be dominated not only by the drop height but
also by the shape of rockfall and the length of the platform on the
slideway. A great drop height and/or a short platform produces a fast impact
velocity. Spherical rockfalls experience a greater impact velocity than
cubes and elongated cuboids. A layer of cushion on the protection measures
may reduce the impact force to a greater extent. The reduction effects are
dominated by the cushion material and the thickness of the cushion layer.
The thicker the cushion layer, the greater the reduction effect and the less
the impact force. The stiffer the buffer material, the lower the buffering
effect and the greater the impact force. The present study indicates that
the current standard in China for designing protection measures may
overestimate the impact force by not taking into consideration the rockfall
shape, platform, and cushion layer. |
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