Physics of Liquefaction Phenomena around Marine Structures

Groot, M.B. de; Bolton, M. D.; Foray, Pierre; Meijers, P.; Palmer, Andrew; Sandven, Rolf; Sawicki, Andrzej; Teh, T. C.

doi:10.1061/(asce)0733-950x(2006)132:4(227)

Cited by 99 publications

(45 citation statements)

References 27 publications

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“…En la Fig. 1 (tomada de [1]) se muestra, en el gráfico de la derecha, las formas de dichas curvas tensión-deformación ─según el nivel de deformación alcanzado─, representándose en ordenadas la carga tangencial solicitante y en abscisas la deformación de corte producida ; también se representa en dicha figura, en el gráfico de la izquierda, el fenómeno asociado de generación de presión intersticial del suelo saturado (en abscisas se representa la tensión vertical efectiva entre partículas del suelo , que se hace cada vez más pequeña, lo cual es debido a que parte de la tensión vertical actuante es absorbida por el agua intersticial).…”

Section: Estudio Dinámico Del Suelounclassified

Degradación de Suelos Ante Tensión de Corte Cíclica

Galindo

2013

Lámpsakos

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Resumen. En este artículo se estudia el fenómeno de degradación y se proponen dependencias con las variables que intervienen en el problema, planteando la formulación matemática que caracteriza la deformación acumulada y la generación de presión intersticial asociada al fenómeno cíclico. Primeramente se plantea el marco teórico necesario para el adecuado estudio del fenómeno dinámico asociado al proceso de carga tangencial cíclica. A continuación, se introduce un nuevo concepto llamado "ciclo límite" que sirve de referencia para el seguimiento de la degradación del suelo. Por último, se identifican las variables fundamentales que intervienen en el problema de estudio y se plantea, en base a una completa campaña de ensayos disponibles de una investigación anterior, la formulación matemática que permite la caracterización y cuantificación de la deformación acumulada y la generación de presión intersticial generada con el número de ciclos de carga.Palabras clave: Degradación, corte cíclico, generación de presión intersticial, suelos cohesivos, diná-mica de suelos. Abstract.The article describes the phenomenon of degradation and dependencies with the variables involved in the dynamic problem are proposed, considering the mathematical formulation that characterizes the cumulative deformation and pore pressure generation associated with cyclical phenomenon. First, the necessary theoretical framework for the proper study of dynamic phenomena associated with the process of cyclic shear load is raised. Then, a new concept called "limit cycle" that serves as a reference for monitoring soil degradation is introduced. Finally, the fundamental variables involved in the study problem are identified and is raised, based on an earlier test campaign of an available research, the mathematical formulation that allows the characterization and quantification of the accumulated deformation and generation of pore pressure with the number of load cycles.

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Section: Estudio Dinámico Del Suelounclassified

Degradación de Suelos Ante Tensión de Corte Cíclica

Galindo

2013

Lámpsakos

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“…At this state, suction happens in the voids of the soil skeleton and PWP decreases, causing a slight increase in soil's strength. According to de Groot et al [42], when mean shear stress is large enough and sand is not very loose, mean PWP becomes negative, and e ective stress increases similar to the state of soil described here. For a homogenous soil layer that has no variation in material properties with respect to depth, such behavior is not expected and R u will decrease with depth monotonously.…”

Section: Excess Pore Water Pressurementioning

confidence: 99%

Dynamic behavior of large-diameter piles with considering liquefaction under clay layer

Oliaei

Ghotbi

2017

Scientia Iranica

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Abstract. Marine structures are mostly constructed on deep foundations, namely largediameter piles. Such support structures are driven into deposits of saturated granular soil, vulnerable to liquefaction under loadings of dynamic nature, e.g. earthquakes. Although numerous studies have been accomplished to obtain a comprehensive understanding of their performance during liquefaction, a conclusive study has not been presented for the speci c case of large-diameter piles under a clay layer. This issue has great importance in the case of o shore wind turbines, since they are very sensitive to dynamic loadings. In this study, a 3D FEM model was constructed by OpenSeesPL to explore soil and pile responses throughout liquefaction. To capture the precise behavior, a constitutive law based on a multi-surface plasticity was utilized for soil. The described model used in this study is capable of accurate prediction of sand behavior in undrained conditions. Di erent scenarios were tested: variations in pile dimensions, loading frequency, and in uence of clay layer. Sensitivity analyses show that loading frequency, presence of clay layer, and pile diameter could signi cantly a ect the behavior of large-diameter piles in saturated soil conditions.

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“…pore-pressure build-up, associated decrease of effective stress and subsequent reduction of shearing resistance, are already recognized, as well as some models proposed. There exists a vast literature devoted to the above mentioned phenomena and related problems, see the state-of-the-art paper [11], or other review publications as, for example, [3,15,4]. However, the behaviour of liquefied soil is not recognized so well, so this paper is devoted to this important problem.…”

Section: Introductionmentioning

confidence: 97%