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| Titel |
Mechanism of the Donghekou landslide triggered by the 2008 Wenchuan earthquake revealed by discrete element modeling |
| VerfasserIn |
R.-M. Yuan, C.-L. Tang, J.-C. Hu, X.-W. Xu |
| 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 ; 14, no. 5 ; Nr. 14, no. 5 (2014-05-21), S.1195-1205 |
| Datensatznummer |
250118442
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| Publikation (Nr.) |
 copernicus.org/nhess-14-1195-2014.pdf |
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| Zusammenfassung |
| The huge Donghekou landslide was triggered by the Wenchuan earthquake in 2008
with about 2.4 × 107 m3 of rock displaced. The landslide
is considered as an example of an earthquake-induced "ejection" event, where
dislocated slope materials was expelled over a section of the slope, but the kinematic
processes are not well understood. We used the 2-D granular discrete element
method to characterize the kinematic behavior and mechanics of this
"ejection landslide". The initial boundary conditions were applied along
the ball–wall contacts by using derived velocities integrated from strong
motion data with a duration of 125 s, including the peak acceleration near the
Donghekou area. The constraints were primarily determined from the final
geometry of the landslide and geological structures to account for the actual
landslide characteristics. Simulated results showed that the large local
seismic acceleration and a free face under the sliding body, caused by the
dip difference between the upper slide face and the natural slope, originated
from the activation of the landslide. For the lower sliding body, its
kinematic mechanism was changed during sliding. Initially it was a push-type
landslide, and then gradually changed to a retrogressive landslide. The
eroded bed on the slope during the landslide had the potential of slightly increasing the
runout distance from 1435 to 1519 m, and was predicted in the numerical
simulation. |
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