Seismic dynamics of offshore breakwater on liquefiable seabed foundation

Ye, Jianhong; Wang, Gang

doi:10.1016/j.soildyn.2015.02.003

Cited by 87 publications

(17 citation statements)

References 26 publications

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“…It is difficult to interpret the microscopic behaviors of the soil response from the test results. Advanced constitutive models have also been developed to describe the macroscopic stressstrain responses of liquefiable soils (e.g., [5,6,31,32,34,38]). However, all these models are phenomenological in nature, involving a variety of hypotheses and quantities that may not be physically measurable.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of granular soils in cyclic mobility and post-liquefaction process

2016

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Understanding the evolution of microstructure in granular soils can provide significant insights into constitutive modeling of soil liquefaction. In this study, micromechanical perspectives of the liquefaction process are investigated using the Discrete Element simulation. It is observed that during various stages of undrained cyclic loading, the soil exhibits definitive change in the load-bearing structure, indicated by evolution of the coordination number and non-affine displacements. A new particle-void fabric, termed as "centroid distance", is also proposed to quantify the evolution of particles and voids distribution in the granular packing. The fabric index is found to have strong correlation with cyclic mobility and post-liquefaction deformation of granular soils. Evolution of the fabric index indicates that particles and voids redistribute irreversibly before and after liquefaction. A highly anisotropic particle-void structure and loading-bearing capacity can be formed in the post liquefaction stage.

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Section: Introductionmentioning

confidence: 99%

Microstructure evolution of granular soils in cyclic mobility and post-liquefaction process

2016

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“…The developed coupled model FSSI-CAS 2D has been validated by analytical solutions, a series of wave flume tests, and a centrifuge test [39]. It has also been successfully applied to investigate the dynamics of breakwater and its seabed foundation to several types of ocean waves, such as regular waves, breaking waves [43], and tsunami waves, as well as seismic waves [44]. It is indicated that the coupled numerical model FSSI-CAS 2D is applicable for the seismic dynamics of pipeline.…”

Section: Coupled Numerical Model: Fssi-cas 2dmentioning

confidence: 99%

Seismic Dynamics of Pipeline Buried in Dense Seabed Foundation

Zhang

et al. 2019

JMSE

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Submarine pipeline is a type of important infrastructure in petroleum industry used for transporting crude oil or natural gas. However, submarine pipelines constructed in high seismic intensity zones are vulnerable of attacks from seismic waves. It is important and meaningful in engineering design to comprehensively understand the seismic wave-induced dynamics characteristics of submarine pipelines. In this study, taking the coupled numerical model FSSI-CAS 2D as the tool, the seismic dynamics of a submarine steel pipeline buried in dense soil is investigated. Computational results indicate that submarine pipeline buried in dense seabed soil strongly responds to seismic wave. The peak acceleration could be double of that of input seismic wave. There is no residual pore pressure in the dense seabed. Significant resonance of the pipeline is observed in horizontal direction. Comparative study shows that the lateral boundary condition which can avoid wave reflection on it, such as laminar boundary and absorbing boundary should be used for seabed foundation domain in computation. Finally, it is proven that the coupled numerical model FSSI-CAS 2D is applicable to evaluate the seismic dynamics of submarine pipeline.

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“…To develop the governing equations for the dynamic response of the porous seabed, three relationships should be included: stress-strain constitutive relation, momentum balance equations and mass balance equation. In most previous studies [10,17,18], the so-called "u-p" approximate formulation, which ignores the displacement of pore fluid relative to soil particles, was used in the dynamic analysis. For the seismic issue in relatively high frequency range, however, all the inertial terms should be considered to obtain more accurate solutions.…”

Section: Dynamic Response Of Seabed: Governing Equationsmentioning

confidence: 99%

“…Less nonlinearity of soil was found to affect the vertical motion involving mainly the propagation of compressional wave [16]. Based on dynamic Biot's equations for the porous seabed, Ye [17] and Ye and Wang [18] adopted the FEM numerical model to investigate both the vertical and horizontal seismic response of a composite breakwater and its seabed under the pacific coast of Tohoku earthquake.…”

Section: Introductionmentioning

confidence: 99%

Effect of vertical seismic motion on the dynamic response and instantaneous liquefaction in a two-layer porous seabed

Chen

Wang

Chen

et al. 2018

Computers and Geotechnics

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The evaluation of seismic-induced response in the porous seabed is a fundamental problem in geotechnical and coastal engineering. Although the ground motions generally include both horizontal and vertical components, most previous theoretical investigations assumed vertically propagating shear waves in a horizontally layered soil-rock system and simply ignored the effect of site response to vertical earthquake motion. In this paper, the dynamic response and instantaneous liquefaction of porous seabed, induced by vertical earthquake loading, is studied using an analytical method. The seabed is treated as a two-layer poro-elastic medium and characterized by the fully dynamic formulation of Biot theory. The analytical solutions for the response variables, such as induced displacement, pore pressure and vertical effective stress, are respectively derived and the mechanism of instantaneous liquefaction in the liquefiable sediment is investigated based on the excess pore pressure criterion. A set of parametric analysis is carried out to discuss the effects of seawater, seabed and earthquake parameters on the seismic response and maximum liquefaction depth. It is worth noting that the properties of surface seabed layer have significant influence on the seismic response and consequently the potential stability of the seabed, which is important in the analysis of foundations for offshore structures.

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Seismic dynamics of offshore breakwater on liquefiable seabed foundation

Cited by 87 publications

References 26 publications

Microstructure evolution of granular soils in cyclic mobility and post-liquefaction process

Microstructure evolution of granular soils in cyclic mobility and post-liquefaction process

Seismic Dynamics of Pipeline Buried in Dense Seabed Foundation

Effect of vertical seismic motion on the dynamic response and instantaneous liquefaction in a two-layer porous seabed

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