Runout simulation of seismic landslides using discontinuous deformation analysis (Dda) with state-dependent shear strength model

Ting Kai Nian, Yan Jun Zhang, Hao Wu, Guang Qi Chen, Lu Zheng

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

The reliable numerical simulation of the landslide process contributes to the establishment of evidence-based disaster mitigation measures in seismically active zones. To achieve this goal, a simple and unified state-dependent shear strength model of discontinuities is presented to describe the shear strength degradation in a seismic landslide process. The proposed model establishes a relationship between the shear strength parameters and the global safety factor of the slope by assuming that the slope instability (or landslide initiation) is accompanied by an instantaneous shear strength degradation of discontinuities. To realize the model numerically, the algorithms for the computation of global safety factor and the modification of shear strength parameters were incorporated into the discontinuous deformation analysis (DDA). Subsequently, the kinematic accuracy of the improved DDA method was validated by comparisons with theoretical solutions for the dynamic sliding of a block on an inclined plane. Numerical simulations of the Daguangbao landslide triggered by the Wenchuan earthquake were performed using the improved DDA method. The results illustrate that the shear strength degradation of discontinuities affect the evolution process, travel distance, and post-failure shape of the seismic landslide significantly.

本文言語英語
ページ(範囲)1183-1196
ページ数14
ジャーナルCanadian Geotechnical Journal
57
8
DOI
出版ステータス出版済み - 2020

All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 地盤工学および土木地質学

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