A review on recent advancements of substructures for offshore wind turbines

Capacity of modified suction caissons in marine sand under static horizontal loading

Lateral response of improved suction bucket foundation for offshore wind turbine in centrifuge modelling

In the recent past years, utilization of intelligent models for solving geotechnical problems has received considerable attention. This paper highlights the feasibility of adaptive neuro-fuzzy inference system (ANFIS) for predicting the bearing capacity of thin-walled foundations. For this reason, a data set comprising nearly 150 recorded cases of footing load tests was compiled from literature. Footing width, wall length-to-footing width ratio, internal friction angle, and unit weight of soil were set as inputs of the predictive model of bearing capacity. In addition, a pre-developed artificial neural network (ANN) model was utilized to estimate the bearing capacity of thin-walled foundations. The results recommend the workability of ANFIS in predicting the bearing capacity of thin-walled foundation. The coefficient of determination (R
 2) results of 0.933 and 0.875, and root mean square error (RMSE) results of 0.075 and 0.048 for training and testing data sets show higher accuracy and efficiency level of ANFIS in estimating bearing capacity of thin-walled spread foundations compared to the ANN model (R
 2 = 0.710, RMSE = 0.512 for train, R
 2 = 0.420, RMSE = 0.529 for test). Overall, findings of the study suggest utilization of ANFIS, as a feasible and quick tool, for predicting the bearing capacity of thin-walled spread foundations, though further study is still recommended to enhance the reliability of the proposed model.

Prediction of bearing capacity of thin-walled foundation: a simulation approach

Model tests of modified suction caissons in marine sand under monotonic lateral combined loading

Skirts are used to improve the bearing capacity of shallow footings on sandy soil by constraining the soil beneath and containing the plastic flow of soil. They are used as an alternative to deep foundations in soils with low strength at the surface. As there has been available little work studying the performance of skirted foundation, we are performing eighteen laboratory experiments on circular steel footings of different diameters and different skirt lengths. The aim of these experiments is to shed some lights on the effects of skirts on the bearing capacity of shallow footings. The effects of skirt length and the relative density of sand on the ultimate load attained were investigated. From the accomplished laboratory tests, it was found that skirts improve appreciably the sustainability of shallow footings to applied load as they increase the ultimate load of shallow footings by some up to 6.25 times for the current study conditions and variables. The performance of skirted footing depends upon the relative density of sand and on the skirt length to footing diameter ratio. Skirts are more beneficial in case of footings on loose sand than in case of medium and dense sand.

https://cyberleninka.org/article/n/1000632.pdf

Bearing capacity of Skirt circular footing on sand

Shallow footings are subjected to lateral forces induced by earthquake movements, wind loads, water wave pressure, lateral earth pressure, and transmitting power cables. In some structures such as water front structure, earth retaining structure and transmitting power structures, the lateral forces acting on the footings may be dominant. There has been little work studying the performance of skirted footings subjected to lateral loads. Twelve loading tests were performed on small scale circular skirted footing to shed some light on the performance of skirted footings when subjected to lateral loads. The effects of skirt length and the relative density of sand on the performance of the footing were investigated through laboratory testing program. Also a comparative experimental study between ultimate horizontal loads attained by skirted and unskirted footings with the same properties was conducted. From the accomplished laboratory tests it was found that the skirts changed the failure mode of circular shallow footings from sliding mechanism into rotational mechanism. Also the skirts attached to footings increased appreciably the ultimate horizontal capacity of shallow footings.

Horizontal capacity of skirted circular shallow footings on sand

Piled foundation is a method of overcoming difficulties of founding on soft soils to ensure structural safety by transferring structural load through weak soil to a stiff stratum Due to piles importance, it is becoming necessary to avoid pile defects These defects arouse from inadequate ground investigations, construction phases, pile loading test, and natural unforeseen geological causes In this paper bulging is studied as a pile imperfection The effects of bulging width, length, and shape on the pile ultimate load are investigated Bulging may increase pile ultimate load though it is still considered as a pile defect It was found that bulging can increase the ultimate pile load up to 200%

Amr Z. El Wakil

Papers

Bearing capacity of Skirt circular footing on sand

Horizontal capacity of skirted circular shallow footings on sand

Bulging as a pile imperfection