Probabilistic evaluation of the seismic stability of infinite submarine slopes integrating the enhanced Newmark method and random field

Yang, Qing; Zhu, Bin; Hiraishi, Tetsuya

doi:10.1007/s10064-020-02058-5

Cited by 17 publications

(6 citation statements)

References 66 publications

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“…In addition, the traditional Newmark displacement approach usually ignores the effect of dynamic pore water pressure (DPWP), which is an important parameter for significant damage to pore pressure‐prone soil slopes 23–25 . For the seismic displacement analysis of soil slopes using Newmark model and the like, there are also some previous investigations that consider the DPWP, which showed that the yield acceleration will degrade and seismic displacement increases significantly in saturated sandy soil slopes as a result of the co‐seismic DPWP buildup 26–30 . Huang et al 31 .…”

Section: Introductionmentioning

confidence: 99%

“…[23][24][25] For the seismic displacement analysis of soil slopes using Newmark model and the like, there are also some previous investigations that consider the DPWP, which showed that the yield acceleration will degrade and seismic displacement increases significantly in saturated sandy soil slopes as a result of the co-seismic DPWP buildup. [26][27][28][29][30] Huang et al 31 investigated the influence of changing groundwater table and time-dependent DPWP on the dynamic stability of unsaturated sandy slope using finite element modeling and shaking table test, and the results demonstrated that the seismic failure of slope with high groundwater is mainly caused by the water flow around the slope toe where the DPWP is the largest. However, the above-mentioned studies only consider the DPWP accumulation caused by horizontal ground motion and ignore the contribution of the vertical one.…”

Section: Introductionmentioning

confidence: 99%

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Seismic displacement of earth slopes incorporating co‐seismic accumulation of dynamic pore water pressure

Zhang

et al. 2023

Earthq Engng Struct Dyn

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The earthquake-induced displacement of sloping soil mass is an important indicator of co-seismic landslide initiation. In this paper, an improved Newmark displacement model that considers the accumulation of dynamic pore water pressure (DPWP) in the soil caused by both vertical and horizontal ground motions is proposed. The model can quantitatively describe the dynamic changes of the seismic yield acceleration of near-saturated infinite soil slopes. Three different types of ground motion time histories are selected to compare the performance of the proposed Newmark displacement model, and the influence of DPWP accumulation on the slope yield acceleration and on the seismic displacement is obtained. The seismic slope displacement analyses indicate that the weakening effect of slope yield acceleration caused by bidirectional earthquake excitation-induced DPWP is more obvious than when only considering the horizontal ground motion, when the slip surface soils are in near-saturated state.The effect of initial saturation (S r0 ) on the DPWP accumulation caused by vertical ground motion is also investigated. Furthermore, the accumulated seismic displacement can be reasonably explained by the frequency distribution characteristics of the ground motions. Finally, the numerical results of this paper show that the seismic displacement model seldomly considering the effect of DPWP, or only considering the DPWP induced by horizontal ground motion, can significantly underestimate the displacement value when the slip surface soils are in a near-saturated state.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic displacement of earth slopes incorporating co‐seismic accumulation of dynamic pore water pressure

Zhang

et al. 2023

Earthq Engng Struct Dyn

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“…Qin and Chian (2020) assessed the seismic stability of a reinforced slope using the quasi-dynamic approach. The seismic stability of an underwater slope was assessed by Yang et al (2021) using a modified version of the Newmark technique. Srilatha et al (2013) conducted a comparative study of unreinforced and reinforced soil slopes by a shaking table test.…”

Section: Introductionmentioning

confidence: 99%

Upper bound analysis of the anti-seismic stability of slopes considering the effect of the intermediate principal stress

Zhang

Sun²

2023

Front. Earth Sci.

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Considering the intermediate principal stress effect of soils, the unified strength theory was applied to correct the shear strength index of soils. Based on a mechanical model of the anti-seismic stability of slopes, the analytical formula of the stability coefficient was deduced by the upper bound method and the quasi-static method. Then the optimal solution of the stability coefficient was figured out via the Matlab software. The result shows that, if the intermediate principal stress is ignored, the shear strength of soils would obviously be underestimated; this is also the case with the slope stability coefficient, the relative error of which could reach 39.87%. The horizontal and vertical seismic forces significantly affect slope stability. When the horizontal seismic force is considered, the slope stability coefficient Ns is reduced by 79.82%. Similarly, if the seismic effect is not neglected, the stability of the slope would be seriously overestimated. Slope cutting can significantly improve slope stability. When the slope angle is reduced from 90° to 50°, the stability factor increases by 279.82%. The suitable design angle of the slope is between 50° and 60° without taking into account additional elements like groundwater level and stratum structure.

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“…Evaluation of the geological-geotechnical processes that lead to hazardous conditions, particularly seismic-induced landslides, is a necessary element of risk assessment in offshore oil, gas or renewable energy projects (Borges et al, 2020). Recognizing the role of earthquakes as a trigger of submarine landslides, researchers have made significant contributions to the evaluation and understanding of the seismic stability of submarine slopes (Locat and Lee, 2000;Rodriguez Ochoa et al, 2015;Brink et al, 2016;Zhou et al, 2017b;Collico et al, 2020;Yang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Modeling of the Seismic Behavior of Soft Clay Slopes

Camelo

Almeida

et al. 2022

J. Geotech. Geoenviron. Eng.

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This paper presents the experimental results and analysis from two centrifuge experiments that simulated the seismic response of a gentle slope in soft clay. The two models consisted of a three-degree and a six-degree slope in soft clay, respectively, which are representative of typical slopes found on marine seabeds on the continental margins. The models were built in a laminar container in order to reproduce infinite slope boundary conditions. In-flight characterization investigations consisting of T-bar tests and air hammer tests were performed to obtain undrained shear strength profiles and shear wave velocities at various depths, respectively. A suite of earthquakes was

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Probabilistic evaluation of the seismic stability of infinite submarine slopes integrating the enhanced Newmark method and random field

Cited by 17 publications

References 66 publications

Seismic displacement of earth slopes incorporating co‐seismic accumulation of dynamic pore water pressure

Seismic displacement of earth slopes incorporating co‐seismic accumulation of dynamic pore water pressure

Upper bound analysis of the anti-seismic stability of slopes considering the effect of the intermediate principal stress

Centrifuge Modeling of the Seismic Behavior of Soft Clay Slopes

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