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Impact of initial slide on downslope seafloor with a weak layer

Han, Yunrui; Zhang, Wangcheng; Yu, Long; Wang, Zhongtao; Yang, Qing

Impact of initial slide on downslope seafloor with a weak layer Thumbnail


Authors

Yunrui Han

Long Yu

Zhongtao Wang

Qing Yang



Abstract

Submarine landslides are a major offshore geohazard posing increasing threat to offshore and coastal developments. A submarine landslide may usually involve multistage failure triggered by the first failure. During submarine landslide evolution, the emergent sliding mass may act as an impact load on the downslope seafloor potentially leading to surficial erosion of sediments or deeper ploughing failure with the presence of a weak layer. The study presents a comprehensive analysis of seafloor instability and post-failure behaviors subjected to the first slide mass impact, using a large deformation finite element (LDFE) method. Different failure patterns are investigated and the corresponding critical impact loads for triggering the seafloor instability are analyzed. The parameters controlling the strain softening behaviors of soils and the undrained shear strength in the weak layer have significant effects on the critical condition for the seafloor failure. The dynamic inertia of the slide mass, however, has little effect on the results. An empirical equation for assessing the seafloor instability subjected to the first slide impact, with respect to the impact load from the initial slide and the gravity stress relative to the shear strength in the weak layer, is proposed based on a parametric study.

Journal Article Type Article
Acceptance Date Mar 9, 2024
Online Publication Date Mar 18, 2024
Publication Date May 15, 2024
Deposit Date Jun 12, 2024
Publicly Available Date Jun 12, 2024
Journal Ocean Engineering
Print ISSN 0029-8018
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 300
Article Number 117469
DOI https://doi.org/10.1016/j.oceaneng.2024.117469
Public URL https://durham-repository.worktribe.com/output/2473327

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