A new methodology to assess the potential of conjectural trigger mechanisms of submarine landslides exemplified by marine gas occurrence on the Balearic Promontory

Kaminski, Pauline; Sager, Thore F.; Grabe, Jürgen; Urlaub, Morelia

doi:10.1016/j.enggeo.2021.106446

Cited by 17 publications

(3 citation statements)

References 24 publications

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“…The faults could have acted as fluid conduits that resulted in gas‐charging of the shallow sub‐surface. Gas‐charging may reduce the frictional resistance of sediments, thus acting as a pre‐conditioning to slope failure (e.g., Kaminski et al., 2021). Seismogenic fault activity might have acted as a trigger mechanism.…”

Section: Discussionmentioning

confidence: 99%

Development and Emplacement of Ana Slide, Eivissa Channel, Western Mediterranean Sea

Sager

Urlaub

Kaminski

et al. 2022

Geochem Geophys Geosyst

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Section: Discussionmentioning

confidence: 99%

Development and Emplacement of Ana Slide, Eivissa Channel, Western Mediterranean Sea

Sager

Urlaub

Kaminski

et al. 2022

Geochem Geophys Geosyst

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“…A general formula for the yield function proposed by Lagioia et al [36] has been adopted in a few models [37][38][39]. The yield function is capable of describing almost all the yield surface shapes observed in the previous tests, which may be transferred gradually from teardrop to bullet in shape with increasing u w0 , expressed as:…”

Section: Yield Functionmentioning

confidence: 99%

Modification of a Constitutive Model for Gassy Clay

Wang

Yang

2023

JMSE

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Gassy clays containing large, discrete gas bubbles are widely spread in deposits in shallow waters. The existence of gas bubbles may impair the original soil structure, resulting in the instability of offshore foundations and the occurrence of submarine landslides. Although gassy clay was found to exhibit different undrained shear behaviors with variations of the initial pore water pressures and initial gas volume fractions, more experimental studies and theoretical interpretations of the relationship between the effective confining pressure and undrained responses are required. A series of undrained triaxial compression tests is conducted to compare the responses of reconstituted gassy and saturated specimens at an effective confining pressure of 200, 400, or 600 kPa. An existing elastoplastic constitutive model based on the critical state is improved by updating its stress-dilatancy function and yield surface. The dilatancy equation proposed has the potential to quantify the effect of gas bubbles on the dilatancy of the soil matrix. The yield surfaces are reproduced reasonably well by optimizing the expressions of shape parameters under a variety of effective confining pressures. The model developed can describe the stress-dilatancy and stress-strain responses of both the gassy and saturated specimens.

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“…A submarine landslide is a common geological hazard that occurs on the continental shelf and is susceptible to crust-tectonic activity, earthquake effects, or rapid sedimentation [1][2][3][4][5][6][7][8][9][10]. These landslides are characterized by their large volume, high velocity, and runout distances.…”

Section: Introductionmentioning

confidence: 99%

A Methodology to Evaluate the Real-Time Stability of Submarine Slopes under Rapid Sedimentation

Wang,

Zheng,

et al. 2024

JMSE

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Rapid sedimentation is widely recognized as a crucial factor in initiating the instability of submarine slopes. Once the slope fails, the subsequent landslide poses a significant threat to the safety of underwater infrastructures and potentially leads to severe damage to seabed pipelines, offshore foundations, and oil and gas exploitation wells. However, there is currently a lack of numerical methods to effectively assess the real-time stability of submarine slopes under rapid sedimentation. This study firstly employs a calibrated finite element (FE) model-change approach to reproduce the rapid sedimentation processes and proposes a concise method to calculate the safety factors for the real-time stability of sedimenting submarine slopes. Further, a parametric analysis is carried out to evaluate the effect of varying sedimentation rates on slope stability, and the critical sedimentation rate is numerically solved. Moreover, the effect of seismic events with different occurring times on the stability of rapidly sedimenting slopes is investigated in depth, and the most critical seismic loading pattern among various acceleration combinations is achieved. The results indicate that the presence of weak layers during sedimentation is a critical factor contributing to slope instability. The introduced rate of decrease in the safety factor proves valuable in assessing slope safety over a specific period. As the occurrence time of seismic events is delayed, the seismic resistance of the slope decreases, increasing the likelihood of shallower sliding surfaces. The findings offer insights into the mechanisms by which rapid sedimentation influences the stability of submarine slopes and provide valuable insights for predicting the potential instability of rapidly sedimenting slopes under specific seismic activity levels.

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A new methodology to assess the potential of conjectural trigger mechanisms of submarine landslides exemplified by marine gas occurrence on the Balearic Promontory

Cited by 17 publications

References 24 publications

Development and Emplacement of Ana Slide, Eivissa Channel, Western Mediterranean Sea

Development and Emplacement of Ana Slide, Eivissa Channel, Western Mediterranean Sea

Modification of a Constitutive Model for Gassy Clay

A Methodology to Evaluate the Real-Time Stability of Submarine Slopes under Rapid Sedimentation

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