Journal
CHINA OCEAN ENGINEERING
Volume 28, Issue 4, Pages 569-578Publisher
CHINA OCEAN PRESS
DOI: 10.1007/s13344-014-0046-z
Keywords
skirted suction caissons; bearing capacity; model tests; monotonic lateral loading; numerical modeling
Funding
- National Natural Science Foundation of China [51078227]
- Shandong Natural Science Foundation [ZR2009FM003]
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Monotonic lateral load model tests were carried out on steel skirted suction caissons embedded in the saturated medium sand to study the bearing capacity. A three-dimensional continuum finite element model was developed with Z_SOIL software. The numerical model was calibrated against experimental results. Soil deformation and earth pressures on skirted caissons were investigated by using the finite element model to extend the model tests. It shows that the skirted structure can significantly increase the lateral capacity and limit the deflection, especially suitable for offshore wind turbines, compared with regular suction caissons without the skirted at the same load level. In addition, appropriate determination of rotation centers plays a crucial role in calculating the lateral capacity by using the analytical method. It was also found that the rotation center is related to dimensions of skirted suction caissons and loading process, i.e. the rotation center moves upwards with the increase of the skirted width and length; moreover, the rotation center moves downwards with the increase of loading and keeps constant when all the sand along the caisson's wall yields. It is so complex that we cannot simply determine its position like the regular suction caisson commonly with a specified position to the length ratio of the caisson.
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