Mechanism of rock avalanche induced by earthquake - Insight from the discontinuous numerical modeling approach

Xinbin Tu, Gaofeng Zhao, Fuchu Dai, Jian Zhao

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

1 Citation (Scopus)

Abstract

The Ms 8.0 Wenchuan earthquake occurred on 12 May, 2008 triggered over 56,000 landslides in the affected area, especially many large-scale rock avalanches distributed along the coseismic surface rupture. These rock avalanches were usually thought to be caused by the ground vibration during earthquake. Based on the evidences identified during our field investigation on many rock avalanches, it is found that rock avalanches distributed along the surface rupture may be generated by the seismogenic fault activity directly instead of ground motion. During the earthquake, rock masses of the mountain slopes fractured along the slip zone of seismogenic fault, firstly by the fault movement, which triggered rock avalanches. The ground vibration played a minor role in the causative mechanism of rock avalanches. In this paper, the Discontinuous Deformation Analysis (DDA) is adopted to verify the mechanism of rock avalanche induced by the Wenchuan earthquake. Two initial causative factors are considered in the numerical model to compare and verify the effect on the formation of rock avalanche, namely, ground motion and displacement along the seismogenic fault. According to the criterion put forward by the authors, here we show an agreement on the mechanism between the numerical results and observations during field investigation.

Original languageEnglish
Title of host publicationHarmonising Rock Engineering and the Environment - Proceedings of the 12th ISRM International Congress on Rock Mechanics
PublisherISRM
Pages2003-2006
Number of pages4
ISBN (Print)9780415804448
Publication statusPublished - 2012
Externally publishedYes
EventInternational Society of Rock Mechanics Series of Symposia and Conferences 2011 - China National Convention Center (CNCC), Beijing, China
Duration: 18 Oct 201121 Oct 2011
Conference number: 12th
https://www.isrm.net/gca/index.php?id=1053

Conference

ConferenceInternational Society of Rock Mechanics Series of Symposia and Conferences 2011
Abbreviated titleISRM 2011
CountryChina
CityBeijing
Period18/10/1121/10/11
OtherInternational Congress on Rock Mechanics of the International Society for Rock Mechanics 2011

Proceedings title = Harmonising Rock Engineering and the Environment
Internet address

Keywords

  • Numerical modeling
  • Rock mass
  • Rock slopes and foundations
  • Stability analysis

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