scholarly journals Ejection mechanism of the Donghekou landslide triggered by the 2008 Wenchuan Earthquake revealed by discrete element modeling

2013 ◽  
Vol 1 (6) ◽  
pp. 7667-7700 ◽  
Author(s):  
R.-M. Yuan ◽  
C.-L. Tang ◽  
J.-C. Hu ◽  
X.-W. Xu
Keyword(s):  
Wenchuan Earthquake ◽  
Strong Motion ◽  
Initial Boundary ◽  
Discrete Element ◽  
Discrete Element Modeling ◽  
Runout Distance ◽  
2008 Wenchuan Earthquake ◽  
Motion Data ◽  
Ejection Mechanism ◽  
Granular Discrete Element

Abstract. The huge Donghekou landslide was triggered by the Wenchuan earthquake in 2008 with about 2.4×107m3 of rock displaced. The landslide is considered as an example of earthquake-induced ejection event, 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 ejection of the landslide. For the lower slide body, its kinematic mechanism was changed during sliding. Initially it was a pushed landslide, and then gradually changed to a retrogressive landslide. The eroded bed on the slope during the landslide could slightly increase the runout distance from 1435 m to 1519 m, and was predicted in the numerical simulation.

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

2014 ◽  
Vol 14 (5) ◽  
pp. 1195-1205 ◽  
Author(s):  
R.-M. Yuan ◽  
C.-L. Tang ◽  
J.-C. Hu ◽  
X.-W. Xu
Keyword(s):  
Wenchuan Earthquake ◽  
Strong Motion ◽  
Initial Boundary ◽  
Discrete Element ◽  
Discrete Element Modeling ◽  
Runout Distance ◽  
2008 Wenchuan Earthquake ◽  
Motion Data ◽  
Kinematic Behavior ◽  
Granular Discrete Element

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.

Seismic Response of a Hill in Wenxian, Gansu, Observed from Aftershocks of 2008 Wenchuan Earthquake

2011 ◽  
Vol 243-249 ◽  
pp. 3952-3957 ◽  
Author(s):  
Yu Xia Lu ◽  
Kun Liu ◽  
Yu Cheng Shi ◽  
Qian Li
Keyword(s):  
Site Response ◽  
Ground Motions ◽  
Strong Motion ◽  
Spectral Ratio ◽  
Gansu Province ◽  
Spectra Analysis ◽  
2008 Wenchuan Earthquake ◽  
Motion Data ◽  
Source Effects ◽  
The Hill

To help understand the ground motions of the topographic site, the workers of Seismic Bureau of Gansu province deployed a temporary array of seismometers around the Wenxian hill and recorded ground motions from Wenchuan aftershocks. Only 11 aftershocks were recorded on all stations across the hill, these data were collected to facilitate studies of site response, wave propagation effect, and correlations of mainshock damage with local site conditions. In this paper, we analyze the weak motion data as well as the strong-motion data, and conduct comparisons of peak ground accelerations, seismic spectra analysis, and spectral ratio analysis. A more complete description of the site’s amplification, its relationship to topography, and its relationship to earthquake source effects are provided. The result shows that the ground motion was consistently amplified at station at or near the top of the hill compared with stations at the base of the hill and the amplifications frequency dependent and has its maximum at the resonant frequency of the site.

Baseline Correction of Digital Strong-Motion Data-Examples from the 2008 Wenchuan, China, Earthquake

2011 ◽  
Vol 378-379 ◽  
pp. 247-250 ◽  
Author(s):  
Heng Li ◽  
Dun Wang ◽  
Yong Jian Cai ◽  
Jian Chao Wu ◽  
Gang Liu
Keyword(s):  
Ground Motion ◽  
Strong Motion ◽  
Correction Method ◽  
Gps Data ◽  
Main Concern ◽  
Baseline Correction ◽  
Permanent Displacement ◽  
2008 Wenchuan Earthquake ◽  
Motion Data ◽  
Long Period Ground Motion

This paper analyzes key noises within digital strong-motion acceleration recording that can result in baseline offset, and according to their specific position provide a baseline correction scheme for preserving the long-period ground motion. This correction method is then applied to the digital acceleration records from the 2008 Wenchuan earthquake, and also, when compared with GPS data (including some high frequency of 1Hz GPS data), it is shown that this method can well restore displacement of ground motion, including permanent displacement which is the main concern of seismologists. Furthermore, compared with other methods that aim to restore the ground displacement, it has much greater stability.

Sign in / Sign up

Export Citation Format

Share Document