Landslide amplification by liquefaction of runout-path material after the 2008 Wenchuan (M 8.0) earthquake, China

Auteur(s) et Affiliation(s)

WANG, G.

Research Center on Landsides, Disaster Prevention Research Inst., univ., Kyoto, Japon

HUANG, R.

State Key lab. of Geo-hazard Prevention and Geo-environment Protection, Univ. of Technology, Chengdu, Chine

CHIGIRA, M.

Disaster Prevention Research Inst., Univ., Kyoto, Japon

WU, X.

School of Civil Engineering, Southwest Jiaotong Univ., Chengdu, Chine

LOURENÇO, D.N.

School of Earth and Ocean Sciences, Univ., Cardiff, Royaume-Uni

Description :
During the 2008 Wenchuan earthquake, about 60 000 landslides were triggered. Among these, the most catastrophic was the Xiejiadian landslide in Pengzhou city. Through field investigation and laboratory testing, the AA. conclude that this landslide primarily formed from colluvial deposits in the valley and secondarily from failure of slopes in granitic rock located uphill. The AA. hypothesize that the main part of the landslide resulted from seismogenic liquefaction of valley colluvium, rather than from liquefaction potentially caused by undrained loading from the granitic slope failures impacting the colluvium. Therefore, they took samples from different areas of the landslide deposit and performed undrained cyclic shear tests on them in the laboratory. The results showed that the sandy soils that comprise most of the deposit are highly liquefiable under seismic loading. It is concluded that liquefaction of the colluvium in the valley during the earthquake was the main reason for this rapid long-runout landslide.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 3, p. 265-274, nombre de pages : 10, Références bibliographiques : 1 p.

Date :
2013

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais