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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 5 | Copyright

Special issue: Progress in landslide hazard and risk evaluation

Nat. Hazards Earth Syst. Sci., 14, 1195-1205, 2014
https://doi.org/10.5194/nhess-14-1195-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 21 May 2014

Research article | 21 May 2014

Mechanism of the Donghekou landslide triggered by the 2008 Wenchuan earthquake revealed by discrete element modeling

R.-M. Yuan2,1, C.-L. Tang3, J.-C. Hu3, and X.-W. Xu1 R.-M. Yuan et al.
  • 1Key Laboratory of Active Tectonics and Volcano, China Earthquake Administration, Beijing 100029, China
  • 2Institute of Geology, China Earthquake Administration, Beijing 100029, China
  • 3Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan

Abstract. 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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