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A platform for research: civil engineering, architecture and urbanism
Improvement of bearing capacity of vibratory driven open-ended tubular piles
Pile foundations for multilegged support structures for offshore wind energy plants are commonly installed by pile driving. Vibratory driving for offshore foundation piles is unusual, because of its installation effects. During the installation the soil inside and outside of the pile is compacted and the stresses are reduced. Therefore the bearing capacity of vibratory driven piles is reduced compared to driven piles. A new method is presented to increase the vertical bearing capacity of vibratory driven piles. After the pile installation the soil at the pile toe is braced, such that a soil plug develops. The brace can be caused by geotechnical foams aswell as by mechanical displacement. The potential of this newmethod is drawnup by the use of numerical simulations. A case study is performed to estimate the increase of the bearing capacity depending on the achieved stress increase at the pile toe. Using this new method, the advantages of vibratory driven piles such as its fast and noise reduced installation are combined with increased bearing capacity. The bearing capacity is fully mobilised at very low settlements. Therefore the settlements of this improved pile are expected to be smaller than the settlement of traditional jacked piles under service loads.
Improvement of bearing capacity of vibratory driven open-ended tubular piles
Pile foundations for multilegged support structures for offshore wind energy plants are commonly installed by pile driving. Vibratory driving for offshore foundation piles is unusual, because of its installation effects. During the installation the soil inside and outside of the pile is compacted and the stresses are reduced. Therefore the bearing capacity of vibratory driven piles is reduced compared to driven piles. A new method is presented to increase the vertical bearing capacity of vibratory driven piles. After the pile installation the soil at the pile toe is braced, such that a soil plug develops. The brace can be caused by geotechnical foams aswell as by mechanical displacement. The potential of this newmethod is drawnup by the use of numerical simulations. A case study is performed to estimate the increase of the bearing capacity depending on the achieved stress increase at the pile toe. Using this new method, the advantages of vibratory driven piles such as its fast and noise reduced installation are combined with increased bearing capacity. The bearing capacity is fully mobilised at very low settlements. Therefore the settlements of this improved pile are expected to be smaller than the settlement of traditional jacked piles under service loads.
Improvement of bearing capacity of vibratory driven open-ended tubular piles
Grabe, Jürgen (author) / Pucker, Tim (author)
2015-06-01
2-s2.0-84960450197
Conference paper
Electronic Resource
English
DDC:
690
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