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Criteria for planar shear band propagation in submarine landslides along weak layers
Landslides ( IF 6.7 ) Pub Date : 2019-12-09 , DOI: 10.1007/s10346-019-01310-8
Wangcheng Zhang , Mark F. Randolph , Alexander M. Puzrin , Dong Wang

Gigantic submarine landslides pose a significant threat to offshore infrastructures and may be initiated by an inconspicuous weakened zone, followed by catastrophic shear band propagation under the effect of strain softening. Much attention has been paid over the last two decades to unidirectional (parallel to the travel direction of sliding mass) shear band propagation (SBP) related exclusively to an initiation zone that is wide relative to the SBP direction. The paper investigates for the first time the mechanisms of more realistic planar shear band propagation via numerical modelling including finite element and finite difference analyses. Rather than propagating only along the travel direction for a 1D shear band in a plane-strain slope, the multidirectional propagation behaviour of a planar shear band depends significantly on the aspect ratio of the initiation zone. New criteria for catastrophic propagation of a planar shear band are proposed and are shown to be in good agreement with the numerical results. The criteria with respect to the initiation zone area can be incorporated easily within a GIS-based stability analysis of catastrophic submarine landslides, facilitating robust hazard analysis for offshore developments.

中文翻译:

海底滑坡沿弱层平面剪切带传播的准则

巨大的海底滑坡对海上基础设施构成重大威胁,可能由一个不显眼的弱化区引发,随后在应变软化作用下发生灾难性的剪切带传播。在过去的 20 年中,人们对单向(平行于滑动质量的行进方向)剪切带传播 (SBP) 给予了很多关注,该传播 (SBP) 仅与相对于 SBP 方向较宽的起始区有关。该论文首次通过包括有限元和有限差分分析在内的数值建模研究了更真实的平面剪切带传播机制。不是仅沿平面应变斜率中的一维剪切带的行进方向传播,平面剪切带的多向传播行为很大程度上取决于起始区的纵横比。提出了平面剪切带灾难性传播的新标准,并表明与数值结果非常吻合。关于起始区区域的标准可以很容易地合并到基于 GIS 的灾难性海底滑坡稳定性分析中,有助于对海上开发进行稳健的危险分析。
更新日期:2019-12-09
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