Significance of the actual nonlinear slope geometry for catastrophic failure in submarine landslides

Puzrin, Alexander M.; Gray, Thomas E.; Hill, Andrew

doi:10.1098/rspa.2014.0772

Cited by 37 publications

(58 citation statements)

References 37 publications

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“…(6) increases and can, in principle, exceed the current length of the slip surface. Puzrin et al (2015) have shown that if the slip surface starts propagating, it will always reach the boundaries of the quasi-stable zone, as long as the average shear stress ratio r remains positive (always true within the quasi-stable zone, where r > 0). This is, of course, assuming that excess porewater pressures and the degradation index do not change during slip surface growth.…”

Section: Unstable Growth Of Slip Surfaces In Quasi-stable Zonementioning

confidence: 99%

“…1). For a curved slope, Puzrin et al (2015) have demonstrated that the initial slip surface formed in the unstable zone (r > 1) will propagate catastrophically (i.e., under existing external forces) into the quasi-stable zone (r > 0) if its initial length, L i , exceeds the critical value…”

Section: Unstable Growth Of Slip Surfaces In Quasi-stable Zonementioning

confidence: 99%

“…Before investigating the ploughing-runout problem, we briefly introduce the framework of the SBP approach to catastrophic (unstable) growth of slip surfaces in the quasi-stable zone leading to the slab failures (e.g., Puzrin and Germanovich 2005;Puzrin et al 2015). In this approach, the slip surface is assumed to be parallel to the slope surface (Fig.…”

Section: Unstable Growth Of Slip Surfaces In Quasi-stable Zonementioning

confidence: 99%

“…Seismic slope stability analysis based on shear band propagation has been performed in Puzrin et al (2015) using the pseudostatic approach with degradation of the shear strength as a result of the cyclic loading. However, in contrast to a typical slab failure Fig.…”

Section: Unstable Growth Of Slip Surfaces In Quasi-stable Zonementioning

confidence: 99%

“…A particular form of shear band propagation, which has received considerable attention (Locat et al 2011(Locat et al , 2013Quinn et al 2011Quinn et al , 2012Dey et al 2015), is a progressive spreading failure accompanied by an uphill growth of the shear band in subaerial landslides driven by the removal of the downslope support. In the past few years a number of novel analytical, numerical, and experimental tools have been developed and validated (Viesca and Rice 2012;Puzrin et al 2015Puzrin et al , 2016aPuzrin et al , 2016bGermanovich et al 2016;Zhang et al 2015Zhang et al , 2016, extending the SBP approach to account for actual nonlinear slope geometries, different types of triggers (excess pore-water pressures, seismic loading), dynamic propagation effects, and retrogressive spreading above the failed slab in submarine landslides. This paper takes the SBP approach further, towards a unified treatment of various geomorphological features, by exploring what happens at the bottom of the failed slab in the stable bottom zone of the slope (blue in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Simple criteria for ploughing and runout in post-failure evolution of submarine landslides

Puzrin

2016

Can. Geotech. J.

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This paper extends shear band propagation analysis of slope failures to the investigation of ploughing and runout phenomena in submarine landslides. The ability to predict the two different modes of post-failure landslide evolution is critical for determining the tsunami hazard and type of landslide impact on offshore structures. The proposed analysis is based on the analogy between ploughing and spreading failures. It uses the energy balance approach to develop the criterion for progressive shear band propagation driven by accumulation of sliding material on top of the stable slope. This criterion is then combined with the kinematic passive block mechanism to produce analytical ploughing failure criteria formulated in terms of the critical rise in the seabed level. If the minimum rise of the seabed level at which ploughing can take place is larger than the maximum possible free-standing step in the seabed surface, the first passive failure block will start crumbling over top the stable zone causing the landslide to runout. Application of the derived criteria to the analysis of observed geomorphological features is demonstrated using an example of a paleolandslide complex in the Caspian Sea.

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Section: Unstable Growth Of Slip Surfaces In Quasi-stable Zonementioning

confidence: 99%

Section: Unstable Growth Of Slip Surfaces In Quasi-stable Zonementioning

confidence: 99%

Section: Unstable Growth Of Slip Surfaces In Quasi-stable Zonementioning

confidence: 99%

Section: Unstable Growth Of Slip Surfaces In Quasi-stable Zonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simple criteria for ploughing and runout in post-failure evolution of submarine landslides

Puzrin

2016

Can. Geotech. J.

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Submarine Landslides—Stability Analysis and Risk Assessment for Offshore Developments

Puzrin

Rushton

Mackenzie

et al. 2017

Encyclopedia of Maritime and Offshore Engineering

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As oil and gas developments move into deeper waters, potential exposure to geohazards becomes an important project risk driver. Landslide deposits and features observed on the seabed in the vicinity of potential future development indicate processes that were active in the geological past and can be expected to continue in the future. Rapid yet spatially extensive analysis of landslide risk is a key requirement of the geohazard assessment for many oil and gas developments, with an aim to provide an estimate of the annual probability of slope failure across the entire proposed development area as an input to the QRA. Well‐established methods exist for probabilistic assessment of slope stability through GIS‐based application of a limit equilibrium infinite slope geomechanical model. Shear band propagation is an effective mechanism to explain large landslides observed in the sediment record that cannot be explained through limit equilibrium alone. A novel GIS‐based probabilistic slope stability assessment using SBP approach allows for improved pixel‐based estimates of the annual probability of failure for a variety of observed landslide mechanisms, such as slab, spreading, ploughing and run‐out failures. This GIS‐based tool has been successfully employed as part of a landslide risk assessment of the ACG development, Caspian Sea, contributing to a landslide risk score for each geohazard province within the area.

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Numerical modeling of combined effects of upward and downward propagation of shear bands on stability of slopes with sensitive clay

Dey

Hawlader

Phillips

et al. 2016

Num Anal Meth Geomechanics

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SUMMARYModeling of progressive development of zones of large inelastic shear deformation (shear band) that results from strain-softening behavior of sensitive clays could explain the failure mechanisms of large landslides. Because of toe erosion, a shear band can be initiated and propagated upward (inward) from the river bank. On the other hand, upslope surcharge loading could generate shear bands that might propagate down towards the river bank. In the present study, upward and downward propagation of shear bands and failure of sensitive clay slopes are modeled using the Coupled Eulerian Lagrangian approach in Abaqus finite element (FE) software. It is shown that the formation and propagation of shear bands are significantly influenced by kinematic constraints that change with displacements of the soil masses, and therefore the propagation of an existing shear band might be stopped and new shear bands could be formed. The main advantages of the present FE modeling are: (i) extremely large strains in the shear bands can be successfully simulated without numerical issues, (ii) a priori definition of shearing zones is not required to tackle severe strains; instead, the FE program automatically identifies the critical locations for shear band formation and propagation. Toe erosion could significantly increase the slope failure potential because of upslope surcharge loading. FE analyses with a thick and thin sensitive clay layers show that the global failure could occur at lower surcharge loads in the former as compared to the latter cases.

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Significance of the actual nonlinear slope geometry for catastrophic failure in submarine landslides

Cited by 37 publications

References 37 publications

Simple criteria for ploughing and runout in post-failure evolution of submarine landslides

Simple criteria for ploughing and runout in post-failure evolution of submarine landslides

Submarine Landslides—Stability Analysis and Risk Assessment for Offshore Developments

Numerical modeling of combined effects of upward and downward propagation of shear bands on stability of slopes with sensitive clay

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