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Pore-pressure-induced Softening and Long-Term Behaviour of Offshore Pile Foundations (2011)
Cuéllar, Pablo
Ratcheting convective cells of sand grains around offshore piles under cyclic lateral loads (2009)
Cuéllar, Pablo ; Baeßler, Matthias ; Rücker, Werner
Sand densification around the pile has traditionally been regarded as an explanation for the grain migration and soil subsidence that often occur around cyclic laterally loaded piles embedded in sand. Supported by new empirical evidence, this paper proposes that, additionally to some soil densification around the pile, the main cause for the continuous "steady-state" grain migration is a convective cell flow of sand grains in the vicinities of the pile head. Such convective flow would be caused by a ratcheting mechanism triggered by the cyclic low-frequency lateral displacements of the pile. Furthermore, the experimental results suggest that the limit between the convective cell and the static soil is marked by a distinct direct shear surface. This might shed some light into the complex phenomena related to the pile-soil interaction in the upper layers of the bedding, which are normally the main contributor for the lateral load-bearing capacity of piles.
CPT-based design for driven piles. Insight into the ICP method and general differences with UWA, NGI and FUGRO approaches (2008)
Cuéllar, Pablo
Stoffmodell für Sande im Rahmen der "Generalized Plasticity" Theorie. Anwendungen und Implementierung für die Simulation von Offshore-Pfahlgründungen. (2008)
Cuéllar, Pablo
Numerical Investigations of an Offshore Pile Foundation - Preliminary results with GeHoMadrid FE Code (2009)
Cuéllar, Pablo
Investigaciones Numéricas y Experimentales para la Cimentación Offshore de Generadores Eólicos en el Mar del Norte (2010)
Cuéllar, Pablo
Special issues for the coupled transient simulation of laterally loaded piles and novel experimental findings. (2010)
Cuéllar, Pablo
Numerical and Experimental Investigations for an Offshore Pile Foundation. (2009)
Cuéllar, Pablo
Pile Foundations for Offshore Wind Turbines. Numerical and Experimental Investigations. (2009)
Cuéllar, Pablo
Numerical investigations for the pile foundation of an offshore wind turbine under transient lateral load (2010)
Cuéllar, Pablo ; Pastor, M. ; Mira, P. ; Fernández-Merodo, J.A. ; Baeßler, Matthias ; Rücker, Werner
Numerical analysis can be useful for the investigation of important aspects of offshore foundation prototypes that otherwise could hardly be studied experimentally, like the evolution of pore-water pressure around the monopile foundation of an offshore wind turbine under extreme loading. A combination of mixed pressuredisplacement formulations along with a constitutive model for sands based on the Generalized Plasticity Theory can replicate accurately the soil behaviour in saturated conditions. However, additional issues must be taken into account in order to perform numerical simulations of offshore piles. Some implications of the Babuska-Brezzi restriction, as well as considerations about the pile-soil interface and suitable solution strategies are discussed here. Due to the high cost of the transient analysis, the parallel computation offers a promising perspective, but can be complex and needs to be implemented carefully in order to avoid a performance deterioration. A brief overview on current trends and functional software is given here.
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