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Titel |
Ejection mechanism of the Donghekou landslide triggered by the 2008 Wenchuan Earthquake revealed by discrete element modeling |
VerfasserIn |
Jyr-Ching Hu, Ren-Mao Yuan, Chao-Lung Tang, Xi-Wei Xu |
Konferenz |
EGU General Assembly 2013
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 15 (2013) |
Datensatznummer |
250075216
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Zusammenfassung |
In 2008, a huge Donghekou landslide was triggered by the Wenchuan earthquake displacing
about 2.3Ã107 m3 of rock. The kinematic behavior of this landslide is simulated using a
two-dimensional (2-D) discrete element model (PFC2D code). Our numerical model is
composed of discs bonded together. The initial boundary conditions are 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 are primarily determined from the final geometry of the landslide
and variety of geological structures including local levels of material disruption to
account for actual landslide characteristics. Simulated results show 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 ejection of the landslide. For the lower slide body, its kinetic mechanism is
changed during sliding. Initially it was a pushed landslide which then gradually
changed to a retrogressive landslide. Based on the characteristics of the Donghekou
landslide, our 2-D model describes the kinetic process very well. However, when
gauging the influence of geometry with regard to movement directions and the
distribution of landslide debris deposits, three-dimensional models are compulsory. |
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