Observed increases in offshore pile driving resistance

Bhattacharya, Subhamoy; Carrington, T.; Aldridge, T

doi:10.1680/geng.2009.162.1.71

Cited by 17 publications

(5 citation statements)

References 9 publications

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“…For a typical European offshore site, the ground conditions can be approximated by a sand with an effective unit weight of c9 5 9?7 kN/m 3 and a friction angle of Q cv 5 30˚ (Bhattacharya et al, 2009;Kü hn, 2001). Applying a factor of safety of 2 on the ultimate capacity as outlined in API RP 2A-WSD (American Petroleum Institute, 2007) and employing the design procedure described by Schakenda et al (2011), a single caisson approximately 18 m in diameter with a skirt penetration depth of 18 m would be required.…”

Section: Implications For Prototype Structuresmentioning

confidence: 99%

Centrifuge study on the cyclic performance of caissons in sand

Cox

O’Loughlin

Cassidy

et al. 2014

International Journal of Physical Modelling in Geotechnics

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Suction caissons are currently considered as an alternative to monopile foundations for met masts and offshore wind turbines. This paper presents the results of a series of centrifuge tests conducted on cyclically loaded suction caissons in very dense dry sand. Two representative caisson foundations were modelled at a 1200 scale in a geotechnical centrifuge and were subjected to a number of different cyclic loading regimes, for up to 12 000 cycles, both of which add to previous data sets available in the literature. During each test, changes in stiffness, the accumulation of rotation and settlement of the system were measured. It was found that the rotational caisson stiffness increased logarithmically with the number of loading cycles, but to a much lower extent than previously reported for monopiles. Similarly the accumulation of rotation was also observed to increase with number of cycles and was well described using a power relationship. An aggregation of rotation was also observed during two-way tests and is believed to be caused by the initial loading cycles that create a differential stiffness within the local soil. Predictions were then made as to the behaviour of a prototype structure based upon the observed test results and established influence parameters

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Section: Implications For Prototype Structuresmentioning

confidence: 99%

Centrifuge study on the cyclic performance of caissons in sand

Cox

O’Loughlin

Cassidy

et al. 2014

International Journal of Physical Modelling in Geotechnics

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“…(1) Homogenous soil conditions (E s = E s0 (z/D) α , α = 0): E s0 is the initial value of soil elastic modulus, α is an index of the function. The elastic modulus is considered constant with a depth of the soil, often used in cohesive soils, weathered bedrock, and very dense sand for typical North Sea soils [7,44].…”

Section: Soil Conditionsmentioning

confidence: 99%

The Simplified Method of Head Stiffness Considering Semi-Rigid Behaviors of Deep Foundations in OWT Systems

Li,

Wang

et al. 2024

Buildings

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Simplified methods of static free head stiffness of the semi-rigid foundation under lateral loads were limited to flexible or rigid behavior by the critical length of piles. This would lead to errors when predicting the static or dynamic performance of their upper structures in OWT Systems. This paper presents a comprehensive analysis of the head static stiffness of the semi-rigid pile without considering the critical length. Firstly, case studies using the energy-based variational method encompassing nearly twenty thousand cases were conducted. These cases involved different types of foundations, including steel pipe piles and concrete caissons, in three types of soil: homogeneous soil, linearly inhomogeneous soil, and heterogeneous soil. Through the analysis of these cases, a series of polynomial equations of three kinds of head static stiffness, containing the relative stiffness of the pile and soil, the slenderness ratio, and Poisson’s ratio, were developed to capture the semi-rigid behavior of the foundations. Furthermore, the lateral deflection, the rotation for concrete caissons in the bridge projects, and several natural frequencies of three cases about the OWT system considering the SSI effect were carried out. the error of high-order frequency of the OWT system reached 13% after considering the semi-rigid effect of the foundation.

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“…Well-sorted aeolian sands are widespread in offshore areas, which is inclined to liquefaction easily [46]. For example, the offshore areas of China are mainly layered soils composed of sand, silt and clay (as shown in Figure 2) [47,48], and the submarine soil layers in the North Sea of Europe are dominated by sands [49]. that seabed seismic liquefaction has many characteristics that differ from those of onshore seismic liquefaction.…”

Section: Marine Deposits Layermentioning

confidence: 99%

Features of Earthquake-Induced Seabed Liquefaction and Mitigation Strategies of Novel Marine Structures

Huang

Han

2020

JMSE

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With the accelerated development of marine engineering, a growing number of marine structures are being constructed (e.g., seabed pipelines, drilling platforms, oil platforms, wind turbines). However, seismic field investigations over recent decades have shown that many marine structures were damaged or destroyed due to liquefaction. Seismic liquefaction in marine engineering can have huge financial repercussions as well as a devastating effect on the marine environment, which merits our great attention. As the effects of seawater and the gas component in the seabed layers are not negligible, the seabed soil layers are more prone to liquefaction than onshore soil layers, and the liquefied area may be larger than when liquefaction occurs on land. To mitigate the impact of liquefaction events on marine engineering structures, some novel liquefaction-resistant marine structures have been proposed in recent years. This paper reviews the features of earthquake-induced liquefaction and the mitigation strategies for marine structures to meet the future requirements of marine engineering.

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Observed increases in offshore pile driving resistance

Cited by 17 publications

References 9 publications

Centrifuge study on the cyclic performance of caissons in sand

Centrifuge study on the cyclic performance of caissons in sand

The Simplified Method of Head Stiffness Considering Semi-Rigid Behaviors of Deep Foundations in OWT Systems

Features of Earthquake-Induced Seabed Liquefaction and Mitigation Strategies of Novel Marine Structures

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