Installation and Lateral Resistance of Model Suction Caissons in Sandy Ground

2014 ◽  
Vol 1030-1032 ◽  
pp. 790-797
Author(s):  
Yasuyuki Nabeshima
Keyword(s):  
Wind Turbines ◽  
Failure Surface ◽  
Lateral Force ◽  
Offshore Wind ◽  
Suction Caisson ◽  
Offshore Wind Turbines ◽  
Lateral Resistance ◽  
Sandy Ground ◽  
Suction Caissons

Suction caissons attract the attention as the foundation of offshore wind turbines. Installation and resistance behaviors of the suction caisson are important factors for the design of foundation. An installation behavior into sandy seafloor was discussed by using a model suction caisson and the failure surfaces in the aluminum rod mass, as the model ground, subjected to lateral force were compared. Consequently, the installation of model suction caisson into sandy sea depended on the permeability of sandy seafloor and lateral resistance of suction caisson depended on the dimension of suction caisson which affected on the shape of failure surface in the ground.

Suction Caisson Foundations for Offshore Wind Turbines

2002 ◽  
Vol 26 (3) ◽  
pp. 145-155 ◽  
Author(s):  
Byron Byrne ◽  
Guy Houlsby ◽  
Chris Martin ◽  
Peter Fish
Keyword(s):  
Design Process ◽  
Wind Turbines ◽  
Research Council ◽  
Shallow Foundations ◽  
Offshore Wind ◽  
Physical Sciences ◽  
Suction Caisson ◽  
Offshore Wind Turbines ◽  
Caisson Foundations ◽  
Suction Caissons

This paper outlines a £ 1.5m, three year, research project that commenced during the middle of 2002 to determine a design framework for shallow foundations for offshore wind turbines. The shallow foundations in focus are suction-installed skirted foundations otherwise known as suction caissons (Houlsby and Byrne, 2000). There are eight distinct themes to the research covering all aspects of the geotechnical performance of these foundations. The funding for the project has been obtained from the Department of Trade and Industry (£ 917k), Industrial Partners (£ 373k) and the Engineering and Physical Sciences Research Council (£ 221k). The results will feed into the design process for offshore wind turbines almost immediately.

Limit Equilibrium Solutions to Anti-overturning Bearing Capacity of Suction Caissons in Uniform and Linearly Increasing Strength Clays

2021 ◽  
Author(s):  
Yuqi Wu ◽  
Qing Yang ◽  
Dayong Li ◽  
Yu Zhang
Keyword(s):  
Bearing Capacity ◽  
Failure Mechanism ◽  
Wind Turbines ◽  
Limit Equilibrium ◽  
Soil Surface ◽  
Equilibrium Analysis ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
Aspect Ratios ◽  
Suction Caissons

Suction caissons supporting offshore wind turbines are exposed to great horizontal loading above the soil surface, which may lead to overturning failure of the caisson. This paper presents a modified three-dimensional failure mechanism to analyze the anti-overturning bearing capacity of suction caissons. The modified failure mechanism is composed of meniscus-conical wedge having meniscus shape at the soil surface and scooped shape. The analytical solution to the anti-overturning bearing capacity of suction caisson is deduced in terms of the limit equilibrium method, following by a parametric study of wedge depth ratio (c) to optimize the critical failure mechanism that satisfies both the force and moment equilibriums. Thus, the methodologies are relatively easy to implement in traditional spreadsheets and the analyses tend to perform very fast. Meanwhile, the effects of gap formation at the rear side of the caisson, loading eccentricity and adhesion factor at caisson-soil interface on anti-overturning bearing capacity are investigated. Comparing with finite element limit analysis results, experimental data and existing theoretical solutions, it is proved that the presented limit equilibrium analysis can satisfactorily predict the anti-overturning bearing capacity of suction caissons with low aspect ratios for offshore wind turbines in uniform and linearly increasing strength clays.

scholarly journals The Seepage and Soil Plug Formation in Suction Caissons in Sand Using Visual Tests

2020 ◽  
Vol 10 (2) ◽  
pp. 566
Author(s):  
Liquan Xie ◽  
Shili Ma ◽  
Tiantian Lin
Keyword(s):  
Rapid Development ◽  
Offshore Wind ◽  
Quadratic Regression ◽  
Soil Plug ◽  
Suction Caisson ◽  
Offshore Wind Turbines ◽  
Green Development ◽  
Hydraulic Gradients ◽  
The Relationship ◽  
Suction Caissons

The rapid development of offshore wind energy in China is becoming increasingly relevant for movement toward green development. This paper presents the results of visual tests of a suction caisson used as foundation for offshore wind turbines. The distribution of hydraulic gradients of sand at the mudline in the caisson was obtained to find out the relationship with the heights of soil plugs. The relationship equation was proposed and obtained by using quadratic regression, guiding project designs, and construction. It was found that there was no soil plug in the caisson when small suction was applied during the suction penetration. The relationship between the heights of the soil plugs and the hydraulic gradient of the soil was proposed and obtained by using quadratic regression to predict (roughly) the height of soil plugs in suction caissons in sand during suction penetration. The influence of settlement outside caissons on the soil plug was found to decrease as the buried depth rose.

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